SCP Server DoS via Malformed SSH on Cisco IOS XE
CVE-2026-20083 Published on March 25, 2026
A vulnerability in the Secure Copy Protocol (SCP) server feature of Cisco IOS XE Software could allow an authenticated, local attacker with low privileges to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper handling of a malformed SCP request. An attacker could exploit this vulnerability by issuing a crafted command through SSH. A successful exploit could allow the attacker to cause the device to reload unexpectedly, resulting in a DoS condition.
Vulnerability Analysis
CVE-2026-20083 can be exploited with local system access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Attack Vector:
LOCAL
Attack Complexity:
LOW
Privileges Required:
LOW
User Interaction:
NONE
Scope:
CHANGED
Confidentiality Impact:
NONE
Integrity Impact:
NONE
Availability Impact:
HIGH
Weakness Type
Improper Handling of Extra Parameters
The software does not handle or incorrectly handles when the number of parameters, fields, or arguments with the same name exceeds the expected amount.
Products Associated with CVE-2026-20083
Want to know whenever a new CVE is published for Cisco IOS XE? stack.watch will email you.
Affected Versions
Cisco IOS XE Software:- Version 3.5.0E is affected.
- Version 3.5.1E is affected.
- Version 3.5.2E is affected.
- Version 3.5.3E is affected.
- Version 3.11.1S is affected.
- Version 3.11.2S is affected.
- Version 3.11.0S is affected.
- Version 3.11.3S is affected.
- Version 3.11.4S is affected.
- Version 3.12.0S is affected.
- Version 3.12.1S is affected.
- Version 3.12.2S is affected.
- Version 3.12.3S is affected.
- Version 3.12.0aS is affected.
- Version 3.12.4S is affected.
- Version 3.13.0S is affected.
- Version 3.13.1S is affected.
- Version 3.13.2S is affected.
- Version 3.13.3S is affected.
- Version 3.13.4S is affected.
- Version 3.13.5S is affected.
- Version 3.13.2aS is affected.
- Version 3.13.0aS is affected.
- Version 3.13.5aS is affected.
- Version 3.13.6S is affected.
- Version 3.13.7S is affected.
- Version 3.13.6aS is affected.
- Version 3.6.0E is affected.
- Version 3.6.1E is affected.
- Version 3.6.2aE is affected.
- Version 3.6.2E is affected.
- Version 3.6.3E is affected.
- Version 3.6.4E is affected.
- Version 3.6.5E is affected.
- Version 3.6.6E is affected.
- Version 3.6.5aE is affected.
- Version 3.14.0S is affected.
- Version 3.14.1S is affected.
- Version 3.14.2S is affected.
- Version 3.14.3S is affected.
- Version 3.14.4S is affected.
- Version 3.15.0S is affected.
- Version 3.15.1S is affected.
- Version 3.15.2S is affected.
- Version 3.15.1cS is affected.
- Version 3.15.3S is affected.
- Version 3.15.4S is affected.
- Version 3.7.0E is affected.
- Version 3.7.1E is affected.
- Version 3.7.2E is affected.
- Version 3.7.3E is affected.
- Version 3.7.4E is affected.
- Version 3.7.5E is affected.
- Version 3.16.0S is affected.
- Version 3.16.1S is affected.
- Version 3.16.1aS is affected.
- Version 3.16.2S is affected.
- Version 3.16.2aS is affected.
- Version 3.16.0cS is affected.
- Version 3.16.3S is affected.
- Version 3.16.2bS is affected.
- Version 3.16.3aS is affected.
- Version 3.16.4S is affected.
- Version 3.16.4aS is affected.
- Version 3.16.4bS is affected.
- Version 3.16.5S is affected.
- Version 3.16.4dS is affected.
- Version 3.17.0S is affected.
- Version 3.17.1S is affected.
- Version 3.17.2S is affected.
- Version 3.17.1aS is affected.
- Version 3.17.3S is affected.
- Version 3.8.0E is affected.
- Version 3.8.1E is affected.
- Version 3.8.2E is affected.
- Version 3.8.3E is affected.
- Version 3.18.0aS is affected.
- Version 3.18.0S is affected.
- Version 3.18.1S is affected.
- Version 3.18.2S is affected.
- Version 3.18.0SP is affected.
- Version 3.18.1SP is affected.
- Version 3.18.1aSP is affected.
- Version 3.18.1bSP is affected.
- Version 3.18.1cSP is affected.
- Version 3.9.0E is affected.
- Version 3.9.1E is affected.
- Version 16.6.1 is affected.
- Version 16.6.2 is affected.
- Version 16.6.3 is affected.
- Version 16.6.4 is affected.
- Version 16.6.5 is affected.
- Version 16.6.4a is affected.
- Version 16.6.5a is affected.
- Version 16.6.6 is affected.
- Version 16.6.7 is affected.
- Version 16.6.8 is affected.
- Version 16.6.9 is affected.
- Version 16.6.10 is affected.
- Version 16.7.1 is affected.
- Version 16.7.1a is affected.
- Version 16.7.1b is affected.
- Version 16.7.2 is affected.
- Version 16.7.3 is affected.
- Version 16.7.4 is affected.
- Version 16.8.1 is affected.
- Version 16.8.1a is affected.
- Version 16.8.1b is affected.
- Version 16.8.1s is affected.
- Version 16.8.1c is affected.
- Version 16.8.1d is affected.
- Version 16.8.2 is affected.
- Version 16.8.1e is affected.
- Version 16.8.3 is affected.
- Version 16.9.1 is affected.
- Version 16.9.2 is affected.
- Version 16.9.1a is affected.
- Version 16.9.1b is affected.
- Version 16.9.1s is affected.
- Version 16.9.3 is affected.
- Version 16.9.4 is affected.
- Version 16.9.3a is affected.
- Version 16.9.5 is affected.
- Version 16.9.5f is affected.
- Version 16.9.6 is affected.
- Version 16.9.7 is affected.
- Version 16.9.8 is affected.
- Version 16.10.1 is affected.
- Version 16.10.1a is affected.
- Version 16.10.1b is affected.
- Version 16.10.1s is affected.
- Version 16.10.1c is affected.
- Version 16.10.1e is affected.
- Version 16.10.1d is affected.
- Version 16.10.2 is affected.
- Version 16.10.1f is affected.
- Version 16.10.1g is affected.
- Version 16.10.3 is affected.
- Version 16.11.1 is affected.
- Version 16.11.1a is affected.
- Version 16.11.1b is affected.
- Version 16.11.2 is affected.
- Version 16.11.1s is affected.
- Version 16.12.1 is affected.
- Version 16.12.1s is affected.
- Version 16.12.1a is affected.
- Version 16.12.1c is affected.
- Version 16.12.1w is affected.
- Version 16.12.2 is affected.
- Version 16.12.1y is affected.
- Version 16.12.2a is affected.
- Version 16.12.3 is affected.
- Version 16.12.8 is affected.
- Version 16.12.2s is affected.
- Version 16.12.1x is affected.
- Version 16.12.1t is affected.
- Version 16.12.4 is affected.
- Version 16.12.3s is affected.
- Version 16.12.3a is affected.
- Version 16.12.4a is affected.
- Version 16.12.5 is affected.
- Version 16.12.6 is affected.
- Version 16.12.1z1 is affected.
- Version 16.12.5a is affected.
- Version 16.12.5b is affected.
- Version 16.12.1z2 is affected.
- Version 16.12.6a is affected.
- Version 16.12.7 is affected.
- Version 16.12.9 is affected.
- Version 16.12.10 is affected.
- Version 16.12.10a is affected.
- Version 16.12.11 is affected.
- Version 16.12.12 is affected.
- Version 16.12.13 is affected.
- Version 16.12.14 is affected.
- Version 17.1.1 is affected.
- Version 17.1.1a is affected.
- Version 17.1.1s is affected.
- Version 17.1.1t is affected.
- Version 17.1.3 is affected.
- Version 17.2.1 is affected.
- Version 17.2.1r is affected.
- Version 17.2.1a is affected.
- Version 17.2.1v is affected.
- Version 17.2.2 is affected.
- Version 17.2.3 is affected.
- Version 17.3.1 is affected.
- Version 17.3.2 is affected.
- Version 17.3.3 is affected.
- Version 17.3.1a is affected.
- Version 17.3.1w is affected.
- Version 17.3.2a is affected.
- Version 17.3.1x is affected.
- Version 17.3.1z is affected.
- Version 17.3.4 is affected.
- Version 17.3.5 is affected.
- Version 17.3.4a is affected.
- Version 17.3.6 is affected.
- Version 17.3.4b is affected.
- Version 17.3.4c is affected.
- Version 17.3.5a is affected.
- Version 17.3.5b is affected.
- Version 17.3.7 is affected.
- Version 17.3.8 is affected.
- Version 17.3.8a is affected.
- Version 17.4.1 is affected.
- Version 17.4.2 is affected.
- Version 17.4.1a is affected.
- Version 17.4.1b is affected.
- Version 17.4.2a is affected.
- Version 17.5.1 is affected.
- Version 17.5.1a is affected.
- Version 17.6.1 is affected.
- Version 17.6.2 is affected.
- Version 17.6.1w is affected.
- Version 17.6.1a is affected.
- Version 17.6.1x is affected.
- Version 17.6.3 is affected.
- Version 17.6.1y is affected.
- Version 17.6.1z is affected.
- Version 17.6.3a is affected.
- Version 17.6.4 is affected.
- Version 17.6.1z1 is affected.
- Version 17.6.5 is affected.
- Version 17.6.6 is affected.
- Version 17.6.6a is affected.
- Version 17.6.5a is affected.
- Version 17.6.7 is affected.
- Version 17.6.8 is affected.
- Version 17.6.8a is affected.
- Version 17.7.1 is affected.
- Version 17.7.1a is affected.
- Version 17.7.1b is affected.
- Version 17.7.2 is affected.
- Version 17.10.1 is affected.
- Version 17.10.1a is affected.
- Version 17.10.1b is affected.
- Version 17.8.1 is affected.
- Version 17.8.1a is affected.
- Version 17.9.1 is affected.
- Version 17.9.1w is affected.
- Version 17.9.2 is affected.
- Version 17.9.1a is affected.
- Version 17.9.1x is affected.
- Version 17.9.1y is affected.
- Version 17.9.3 is affected.
- Version 17.9.2a is affected.
- Version 17.9.1x1 is affected.
- Version 17.9.3a is affected.
- Version 17.9.4 is affected.
- Version 17.9.1y1 is affected.
- Version 17.9.5 is affected.
- Version 17.9.4a is affected.
- Version 17.9.5a is affected.
- Version 17.9.5b is affected.
- Version 17.9.6 is affected.
- Version 17.9.6a is affected.
- Version 17.9.7 is affected.
- Version 17.9.5e is affected.
- Version 17.9.5f is affected.
- Version 17.9.8 is affected.
- Version 17.9.7a is affected.
- Version 17.9.7b is affected.
- Version 17.11.1 is affected.
- Version 17.11.1a is affected.
- Version 17.12.1 is affected.
- Version 17.12.1w is affected.
- Version 17.12.1a is affected.
- Version 17.12.1x is affected.
- Version 17.12.2 is affected.
- Version 17.12.3 is affected.
- Version 17.12.2a is affected.
- Version 17.12.1y is affected.
- Version 17.12.1z is affected.
- Version 17.12.4 is affected.
- Version 17.12.3a is affected.
- Version 17.12.1z1 is affected.
- Version 17.12.1z2 is affected.
- Version 17.12.4a is affected.
- Version 17.12.5 is affected.
- Version 17.12.4b is affected.
- Version 17.12.1z3 is affected.
- Version 17.12.5a is affected.
- Version 17.12.1z4 is affected.
- Version 17.12.6 is affected.
- Version 17.12.5b is affected.
- Version 17.12.5c is affected.
- Version 17.12.6a is affected.
- Version 17.12.5d is affected.
- Version 17.12.6b is affected.
- Version 17.13.1 is affected.
- Version 17.13.1a is affected.
- Version 17.14.1 is affected.
- Version 17.14.1a is affected.
- Version 17.15.1 is affected.
- Version 17.15.1w is affected.
- Version 17.15.1a is affected.
- Version 17.15.2 is affected.
- Version 17.15.1b is affected.
- Version 17.15.1x is affected.
- Version 17.15.1z is affected.
- Version 17.15.3 is affected.
- Version 17.15.2c is affected.
- Version 17.15.2a is affected.
- Version 17.15.1y is affected.
- Version 17.15.2b is affected.
- Version 17.15.3a is affected.
- Version 17.15.4 is affected.
- Version 17.15.3b is affected.
- Version 17.15.4d is affected.
- Version 17.15.4e is affected.
- Version 17.16.1 is affected.
- Version 17.16.1a is affected.
- Version 17.17.1 is affected.
- Version 17.18.1 is affected.
- Version 17.18.1w is affected.
- Version 17.18.1a is affected.