Cisco Catalyst SD-WAN improper link resolution causing file access flaw
CVE-2026-20310 Published on August 5, 2026
Cisco SD-WAN Software Security Hardening Release - Improper Link Resolution Before File Access
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Catalyst SD-WAN engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities.
The vulnerabilities tracked by CVE-2026-20310 are related to improper link resolution before file access issues that are grouped under the Common Weakness Enumeration (CWE) CWE-59.
Vulnerability Analysis
CVE-2026-20310 is exploitable with network access, and requires user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.
Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
HIGH
User Interaction:
NONE
Scope:
CHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
HIGH
Weakness Type
What is an insecure temporary file Vulnerability?
The software attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.
CVE-2026-20310 has been classified to as an insecure temporary file vulnerability or weakness.
Products Associated with CVE-2026-20310
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Affected Versions
Cisco Catalyst SD-WAN Controller:- Version 20.6.4 is affected.
- Version 20.9.2 is affected.
- Version 20.3.6 is affected.
- Version 20.7.2 is affected.
- Version 20.7.1 is affected.
- Version 20.5.1 is affected.
- Version 20.6.2 is affected.
- Version 19.3.0 is affected.
- Version 20.6.1 is affected.
- Version 17.2.4 is affected.
- Version 18.2.0 is affected.
- Version 18.4.6 is affected.
- Version 19.1.0 is affected.
- Version 19.2.4 is affected.
- Version 19.2.929 is affected.
- Version 18.3.8 is affected.
- Version 18.4.303 is affected.
- Version 18.3.7 is affected.
- Version 18.4.1 is affected.
- Version 19.2.097 is affected.
- Version 19.2.0 is affected.
- Version 19.2.099 is affected.
- Version 18.3.6 is affected.
- Version 20.4.2 is affected.
- Version 19.0.0 is affected.
- Version 20.9.1 is affected.
- Version 20.3.5 is affected.
- Version 20.3.1 is affected.
- Version 18.3.5 is affected.
- Version 20.6.3 is affected.
- Version 18.4.3 is affected.
- Version 18.4.4 is affected.
- Version 18.3.3 is affected.
- Version 17.2.8 is affected.
- Version 20.8.1 is affected.
- Version 19.2.32 is affected.
- Version 19.2.2 is affected.
- Version 17.2.5 is affected.
- Version 18.4.0 is affected.
- Version 20.4.1.1 is affected.
- Version 20.1.3 is affected.
- Version 20.1.2 is affected.
- Version 17.2.10 is affected.
- Version 19.2.098 is affected.
- Version 20.1.1 is affected.
- Version 17.2.6 is affected.
- Version 19.2.1 is affected.
- Version 18.3.4 is affected.
- Version 20.4.1 is affected.
- Version 17.2.9 is affected.
- Version 19.2.31 is affected.
- Version 19.0.1a is affected.
- Version 18.3.0 is affected.
- Version 17.2.7 is affected.
- Version 18.4.5 is affected.
- Version 20.3.4 is affected.
- Version 20.3.3 is affected.
- Version 20.4.1.2 is affected.
- Version 20.3.2 is affected.
- Version 18.3.1 is affected.
- Version 20.1.12 is affected.
- Version 19.2.3 is affected.
- Version 20.10.1 is affected.
- Version 20.6.5 is affected.
- Version 20.3.7 is affected.
- Version 20.9.3 is affected.
- Version 20.11.1 is affected.
- Version 20.6.3.2 is affected.
- Version 20.4.2.3 is affected.
- Version 20.3.5.1 is affected.
- Version 20.3.4.3 is affected.
- Version 20.9.3.1 is affected.
- Version 20.6.4.1 is affected.
- Version 20.3.3.2 is affected.
- Version 20.6.5.2 is affected.
- Version 20.3.7.1 is affected.
- Version 20.11.1.1 is affected.
- Version 20.10.1.1 is affected.
- Version 20.6.1.2 is affected.
- Version 20.1.3.1 is affected.
- Version 20.9.2.2 is affected.
- Version 20.6.5.3 is affected.
- Version 20.6.3.3 is affected.
- Version 20.3.7.2 is affected.
- Version 20.6.5.4 is affected.
- Version 20.9.2.3 is affected.
- Version 20.9.4 is affected.
- Version 20.12.1 is affected.
- Version 20.3.8 is affected.
- Version 20.6.6 is affected.
- Version 20.12.2 is affected.
- Version 20.13.1 is affected.
- Version 20.9.5 is affected.
- Version 20.12.3 is affected.
- Version 20.6.7 is affected.
- Version 20.9.5.1 is affected.
- Version 20.14.1 is affected.
- Version 20.12.3.1 is affected.
- Version 20.12.4 is affected.
- Version 20.15.1 is affected.
- Version 20.9.6 is affected.
- Version 20.6.8 is affected.
- Version 20.16.1 is affected.
- Version 20.9.5.3 is affected.
- Version 20.12.4.1 is affected.
- Version 20.15.2 is affected.
- Version 20.12.5 is affected.
- Version 20.9.7 is affected.
- Version 20.15.3 is affected.
- Version 20.12.5.1 is affected.
- Version 20.12.5.2 is affected.
- Version 20.15.4 is affected.
- Version 20.9.7.1 is affected.
- Version 20.18.1 is affected.
- Version 20.12.6 is affected.
- Version 20.9.8 is affected.
- Version 20.15.4.1 is affected.
- Version 20.18.2 is affected.
- Version 26.1.1 is affected.
- Version 20.15.4.2 is affected.
- Version 20.18.2.1 is affected.
- Version 20.12.5.3 is affected.
- Version 20.12.6.1 is affected.
- Version 20.9.8.2 is affected.
- Version 20.15.5 is affected.
- Version 20.18.3 is affected.
- Version 20.12.7 is affected.
- Version 20.9.9 is affected.
- Version 20.18.2.2 is affected.
- Version 20.12.5.4 is affected.
- Version 20.12.7.1 is affected.
- Version 20.15.5.1 is affected.
- Version 20.15.4.3 is affected.
- Version 20.12.6.2 is affected.
- Version 20.15.5.2 is affected.
- Version 20.15.4.4 is affected.
- Version 26.1.1.1 is affected.
- Version 20.9.9.1 is affected.
- Version 20.18.3.1 is affected.
- Version 26.1.1.2 is affected.
- Version 20.15.4.5 is affected.
- Version 20.15.5.3 is affected.
- Version 20.12.7.2 is affected.
- Version 20.9.9.2 is affected.
- Version 20.1.12 is affected.
- Version 19.2.1 is affected.
- Version 18.4.4 is affected.
- Version 18.4.5 is affected.
- Version 20.1.1.1 is affected.
- Version 20.1.1 is affected.
- Version 19.3.0 is affected.
- Version 19.2.2 is affected.
- Version 19.2.099 is affected.
- Version 18.3.6 is affected.
- Version 18.3.7 is affected.
- Version 19.2.0 is affected.
- Version 18.3.8 is affected.
- Version 19.0.0 is affected.
- Version 19.1.0 is affected.
- Version 18.4.302 is affected.
- Version 18.4.303 is affected.
- Version 19.2.097 is affected.
- Version 19.2.098 is affected.
- Version 17.2.10 is affected.
- Version 18.3.6.1 is affected.
- Version 19.0.1a is affected.
- Version 18.2.0 is affected.
- Version 18.4.3 is affected.
- Version 18.4.1 is affected.
- Version 17.2.8 is affected.
- Version 18.3.3.1 is affected.
- Version 18.4.0 is affected.
- Version 18.3.1 is affected.
- Version 17.2.6 is affected.
- Version 17.2.9 is affected.
- Version 18.3.4 is affected.
- Version 17.2.5 is affected.
- Version 18.3.1.1 is affected.
- Version 18.3.5 is affected.
- Version 18.4.0.1 is affected.
- Version 18.3.3 is affected.
- Version 17.2.7 is affected.
- Version 17.2.4 is affected.
- Version 18.3.0 is affected.
- Version 19.2.3 is affected.
- Version 18.4.501_ES is affected.
- Version 20.3.1 is affected.
- Version 20.1.2 is affected.
- Version 19.2.929 is affected.
- Version 19.2.31 is affected.
- Version 20.3.2 is affected.
- Version 19.2.32 is affected.
- Version 20.3.2_925 is affected.
- Version 20.3.2.1 is affected.
- Version 20.3.2.1_927 is affected.
- Version 18.4.6 is affected.
- Version 20.1.2_937 is affected.
- Version 20.4.1 is affected.
- Version 20.3.2_928 is affected.
- Version 20.3.2_929 is affected.
- Version 20.4.1.0.1 is affected.
- Version 20.3.2.1_930 is affected.
- Version 19.2.4 is affected.
- Version 20.5.0.1.1 is affected.
- Version 20.4.1.1 is affected.
- Version 20.3.3 is affected.
- Version 19.2.4.0.1 is affected.
- Version 20.3.2_937 is affected.
- Version 20.3.3.1 is affected.
- Version 20.5.1 is affected.
- Version 20.1.3 is affected.
- Version 20.3.3.0.4 is affected.
- Version 20.3.3.1.2 is affected.
- Version 20.3.3.1.1 is affected.
- Version 20.4.1.2 is affected.
- Version 20.3.3.0.2 is affected.
- Version 20.4.1.1.5 is affected.
- Version 20.4.1.0.01 is affected.
- Version 20.4.1.0.02 is affected.
- Version 20.3.3.1.7 is affected.
- Version 20.3.3.1.5 is affected.
- Version 20.5.1.0.1 is affected.
- Version 20.3.3.1.10 is affected.
- Version 20.3.3.0.8 is affected.
- Version 20.4.2 is affected.
- Version 20.4.2.0.1 is affected.
- Version 20.3.4 is affected.
- Version 20.3.3.0.14 is affected.
- Version 19.2.4.0.8 is affected.
- Version 19.2.4.0.9 is affected.
- Version 20.3.4.0.1 is affected.
- Version 20.3.2.0.5 is affected.
- Version 20.6.1 is affected.
- Version 20.5.1.0.2 is affected.
- Version 20.3.3.0.17 is affected.
- Version 20.6.1.1 is affected.
- Version 20.6.0.18.3 is affected.
- Version 20.3.2.0.6 is affected.
- Version 20.6.0.18.4 is affected.
- Version 20.4.2.0.2 is affected.
- Version 20.3.3.0.16 is affected.
- Version 20.3.4.0.5 is affected.
- Version 20.6.1.0.1 is affected.
- Version 20.3.4.0.6 is affected.
- Version 20.6.2 is affected.
- Version 20.7.1EFT2 is affected.
- Version 20.3.4.0.9 is affected.
- Version 20.3.4.0.11 is affected.
- Version 20.4.2.0.4 is affected.
- Version 20.3.3.0.18 is affected.
- Version 20.7.1 is affected.
- Version 20.6.2.1 is affected.
- Version 20.3.4.1 is affected.
- Version 20.5.1.1 is affected.
- Version 20.4.2.1 is affected.
- Version 20.4.2.1.1 is affected.
- Version 20.3.4.1.1 is affected.
- Version 20.3.813 is affected.
- Version 20.3.4.0.19 is affected.
- Version 20.4.2.2.1 is affected.
- Version 20.5.1.2 is affected.
- Version 20.3.4.2 is affected.
- Version 20.3.814 is affected.
- Version 20.4.2.2 is affected.
- Version 20.6.2.2 is affected.
- Version 20.3.4.2.1 is affected.
- Version 20.7.1.1 is affected.
- Version 20.3.4.1.2 is affected.
- Version 20.6.2.2.2 is affected.
- Version 20.3.4.0.20 is affected.
- Version 20.6.2.2.3 is affected.
- Version 20.4.2.2.2 is affected.
- Version 20.3.5 is affected.
- Version 20.6.2.0.4 is affected.
- Version 20.4.2.2.3 is affected.
- Version 20.3.4.0.24 is affected.
- Version 20.6.2.2.7 is affected.
- Version 20.6.3 is affected.
- Version 20.3.4.2.2 is affected.
- Version 20.4.2.2.4 is affected.
- Version 20.7.1.0.2 is affected.
- Version 20.8.1 is affected.
- Version 20.3.5.0.8 is affected.
- Version 20.3.5.0.9 is affected.
- Version 20.4.2.2.8 is affected.
- Version 20.3.5.0.7 is affected.
- Version 20.6.3.0.7 is affected.
- Version 20.6.3.0.5 is affected.
- Version 20.6.3.0.10 is affected.
- Version 20.6.3.0.2 is affected.
- Version 20.7.2 is affected.
- Version 20.9.1EFT2 is affected.
- Version 20.6.3.0.11 is affected.
- Version 20.6.3.1 is affected.
- Version 20.6.3.0.14 is affected.
- Version 20.6.4 is affected.
- Version 20.9.1 is affected.
- Version 20.6.3.0.19 is affected.
- Version 20.6.3.0.18 is affected.
- Version 20.3.6 is affected.
- Version 20.9.1.1 is affected.
- Version 20.6.3.0.23 is affected.
- Version 20.6.4.0.4 is affected.
- Version 20.6.3.0.25 is affected.
- Version 20.6.5 is affected.
- Version 20.6.3.0.27 is affected.
- Version 20.9.2 is affected.
- Version 20.9.2.1 is affected.
- Version 20.6.3.0.29 is affected.
- Version 20.6.3.0.31 is affected.
- Version 20.6.3.0.32 is affected.
- Version 20.10.1 is affected.
- Version 20.6.3.0.33 is affected.
- Version 20.9.2.0.01 is affected.
- Version 20.9.1_LI_Images is affected.
- Version 20.10.1_LI_Images is affected.
- Version 20.9.2_LI_Images is affected.
- Version 20.3.7 is affected.
- Version 20.9.3 is affected.
- Version 20.6.5.1 is affected.
- Version 20.11.1 is affected.
- Version 20.11.1_LI_Images is affected.
- Version 20.9.3_LI_ Images is affected.
- Version 20.6.3.1.1 is affected.
- Version 20.9.3.0.2 is affected.
- Version 20.6.5.1.2 is affected.
- Version 20.9.3.0.3 is affected.
- Version 20.4.2.3 is affected.
- Version 20.6.3.2 is affected.
- Version 20.6.4.1 is affected.
- Version 20.6.3.0.38 is affected.
- Version 20.6.3.0.39 is affected.
- Version 20.3.5.1 is affected.
- Version 20.3.4.3 is affected.
- Version 20.9.3.1 is affected.
- Version 20.3.3.2 is affected.
- Version 20.6.5.2 is affected.
- Version 20.3.7.1 is affected.
- Version 20.10.1.1 is affected.
- Version 20.6.5.2.1 is affected.
- Version 20.3.4.0.25 is affected.
- Version 20.6.2.2.4 is affected.
- Version 20.6.1.2 is affected.
- Version 20.11.1.1 is affected.
- Version 20.9.3.0.5 is affected.
- Version 20.3.4.0.26 is affected.
- Version 20.6.5.1.3 is affected.
- Version 20.6.3.0.40 is affected.
- Version 20.1.3.1 is affected.
- Version 20.9.2.2 is affected.
- Version 20.6.5.2.3 is affected.
- Version 20.6.5.1.4 is affected.
- Version 20.6.5.3 is affected.
- Version 20.6.3.0.41 is affected.
- Version 20.9.3.0.7 is affected.
- Version 20.6.5.1.5 is affected.
- Version 20.9.3.0.4 is affected.
- Version 20.6.4.0.19 is affected.
- Version 20.6.5.1.6 is affected.
- Version 20.9.3.0.8 is affected.
- Version 20.6.3.3 is affected.
- Version 20.3.7.2 is affected.
- Version 20.6.5.4 is affected.
- Version 20.6.5.1.7 is affected.
- Version 20.9.3.0.12 is affected.
- Version 20.6.4.2 is affected.
- Version 20.6.5.5 is affected.
- Version 20.9.3.2 is affected.
- Version 20.11.1.2 is affected.
- Version 20.6.3.4 is affected.
- Version 20.10.1.2 is affected.
- Version 20.6.5.1.9 is affected.
- Version 20.9.3.0.16 is affected.
- Version 20.6.3.0.45 is affected.
- Version 20.6.5.1.10 is affected.
- Version 20.9.3.0.17 is affected.
- Version 20.6.5.2.4 is affected.
- Version 20.6.4.0.21 is affected.
- Version 20.9.3.0.18 is affected.
- Version 20.6.3.0.46 is affected.
- Version 20.6.3.0.47 is affected.
- Version 20.9.2.3 is affected.
- Version 20.9.3.2_LI_Images is affected.
- Version 20.9.3.0.21 is affected.
- Version 20.9.3.0.20 is affected.
- Version 20.9.4_LI_Images is affected.
- Version 20.9.4 is affected.
- Version 20.6.5.1.11 is affected.
- Version 20.12.1 is affected.
- Version 20.12.1_LI_Images is affected.
- Version 20.6.5.1.13 is affected.
- Version 20.9.3.0.23 is affected.
- Version 20.6.5.2.8 is affected.
- Version 20.9.4.1 is affected.
- Version 20.9.4.1_LI_Images is affected.
- Version 20.9.3.0.25 is affected.
- Version 20.9.3.0.24 is affected.
- Version 20.6.5.1.14 is affected.
- Version 20.3.8 is affected.
- Version 20.6.6 is affected.
- Version 20.9.3.0.26 is affected.
- Version 20.6.3.0.51 is affected.
- Version 20.9.3.0.29 is affected.
- Version 20.12.2 is affected.
- Version 20.12.2_LI_Images is affected.
- Version 20.6.6.0.1 is affected.
- Version 20.13.1_LI_Images is affected.
- Version 20.9.4.0.4 is affected.
- Version 20.13.1 is affected.
- Version 20.9.4.1.1 is affected.
- Version 20.9.5 is affected.
- Version 20.9.5_LI_Images is affected.
- Version 20.12.3_LI_Images is affected.
- Version 20.12.3 is affected.
- Version 20.9.4.1.3 is affected.
- Version 20.6.7 is affected.
- Version 20.9.5.1 is affected.
- Version 20.9.5.1_LI_Images is affected.
- Version 20.9.4.1.6 is affected.
- Version 20.14.1 is affected.
- Version 20.14.1_LI_Images is affected.
- Version 20.9.5.2 is affected.
- Version 20.9.5.2.1 is affected.
- Version 20.9.5.2_LI_Images is affected.
- Version 20.12.3.1 is affected.
- Version 20.12.4 is affected.
- Version 20.15.1_LI_Images is affected.
- Version 20.15.1 is affected.
- Version 20.9.5.1.4 is affected.
- Version 20.9.5.2.7 is affected.
- Version 20.9.5.2.13 is affected.
- Version 20.9.6 is affected.
- Version 20.9.6_LI_Images is affected.
- Version 20.9.5.2.14 is affected.
- Version 20.6.8 is affected.
- Version 20.12.4.0.03 is affected.
- Version 20.16.1 is affected.
- Version 20.16.1_LI_Images is affected.
- Version 20.12.4_LI_Images is affected.
- Version 20.9.5.2.16 is affected.
- Version 20.12.4.0.4 is affected.
- Version 20.12.401 is affected.
- Version 20.9.5.3 is affected.
- Version 20.9.5.3_LI_Images is affected.
- Version 20.12.4.1_LI_Images is affected.
- Version 20.12.4.1 is affected.
- Version 20.9.5.2.21 is affected.
- Version 20.9.6.0.3 is affected.
- Version 20.12.4.0.6 is affected.
- Version 20.15.2_LI_Images is affected.
- Version 20.15.2 is affected.
- Version 20.12.4_Monthly_ES5 is affected.
- Version 20.12.5 is affected.
- Version 20.12.5_LI_Images is affected.
- Version 20.9.7_LI _Images is affected.
- Version 20.9.7 is affected.
- Version 20.15.3 is affected.
- Version 20.15.3_ LI _Images is affected.
- Version 20.12.501 is affected.
- Version 20.12.5.1_LI_Images is affected.
- Version 20.12.5.1 is affected.
- Version 20.12.5.2_LI_Images is affected.
- Version 20.12.5.2 is affected.
- Version 20.15.3.1 is affected.
- Version 20.15.4_LI_Images is affected.
- Version 20.15.4 is affected.
- Version 20.9.7.1_LI _Images is affected.
- Version 20.9.7.1 is affected.
- Version 20.18.1 is affected.
- Version 20.18.1_LI_Images is affected.
- Version 20.12.6_LI_Images is affected.
- Version 20.12.6 is affected.
- Version 20.12.5.1.01 is affected.
- Version 26.0.1 is affected.
- Version 20.9.8 is affected.
- Version 20.9.8_LI_Images is affected.
- Version 20.18.2 is affected.
- Version 20.15.4.1_LI_Images is affected.
- Version 20.15.4.1 is affected.
- Version 20.18.2_LI_Images is affected.
- Version 26.1.1 is affected.
- Version 26.1.1_LI_Images is affected.
- Version 20.18.2.1_LI_Images is affected.
- Version 20.18.2.1 is affected.
- Version 20.15.4.2_LI_Images is affected.
- Version 20.15.4.2 is affected.
- Version 20.12.6.1 is affected.
- Version 20.12.6.1_LI_Images is affected.
- Version 20.12.5.3 is affected.
- Version 20.12.5.3_LI_Images is affected.
- Version 20.9.8.2_LI_Images is affected.
- Version 20.9.8.2 is affected.
- Version 20.18.3 is affected.
- Version 20.18.3_LI_Images is affected.
- Version 20.15.5 is affected.
- Version 20.15.5_LI_Images is affected.
- Version 20.12.7 is affected.
- Version 20.12.7_LI_Images is affected.
- Version 20.9.9 is affected.
- Version 20.9.9_LI_Images is affected.
- Version 20.18.2.2 is affected.
- Version 20.18.2.2_LI_Images is affected.
- Version 20.12.5.4 is affected.
- Version 20.12.5.4_LI_ Images is affected.
- Version 20.12.7.1_LI_Images is affected.
- Version 20.12.6.2_LI_Images is affected.
- Version 20.12.7.1 is affected.
- Version 20.15.5.1 is affected.
- Version 20.15.4.3 is affected.
- Version 20.15.4.3_LI_Images is affected.
- Version 20.15.5.1_LI_Images is affected.
- Version 20.12.6.2 is affected.
- Version 20.15.5.2 is affected.
- Version 20.15.5.2_LI_Images is affected.
- Version 26.1.1.1_LI_Images is affected.
- Version 20.15.4.4 is affected.
- Version 20.15.4.4_LI_Images is affected.
- Version 26.1.1.1 is affected.
- Version 20.9.9.1_LI_Images is affected.
- Version 20.9.9.1 is affected.
- Version 20.18.3.1_LI_Images is affected.
- Version 20.18.3.1 is affected.
- Version 26.1.1.2 is affected.
- Version 26.1.1.2_LI_Images is affected.
- Version 20.15.4.5 is affected.
- Version 20.15.4.5_LI_Images is affected.
- Version 20.15.5.3 is affected.
- Version 20.15.5.3_LI_Images is affected.
- Version 20.12.7.2_LI_Images is affected.
- Version 20.12.7.2 is affected.
- Version 20.9.9.2 is affected.
- Version 20.9.9.2_LI_Images is affected.
- Version 20.12.8_LI_Images is affected.