CVE-2026-20270: Incorrect Calculation (CWE-682) in Cisco IOS XE
CVE-2026-20270 Published on August 5, 2026

Cisco IOS XE Software Security Hardening Release
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XE Software 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-2026-20270 are related to incorrect calculation issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-682.

NVD

Vulnerability Analysis

CVE-2026-20270 is exploitable with network access, and does not require authorization privileges or user interaction. 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:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
CHANGED
Confidentiality Impact:
NONE
Integrity Impact:
NONE
Availability Impact:
HIGH

Weakness Type

Incorrect Calculation

The software performs a calculation that generates incorrect or unintended results that are later used in security-critical decisions or resource management. When software performs a security-critical calculation incorrectly, it might lead to incorrect resource allocations, incorrect privilege assignments, or failed comparisons among other things. Many of the direct results of an incorrect calculation can lead to even larger problems such as failed protection mechanisms or even arbitrary code execution.


Products Associated with CVE-2026-20270

Want to know whenever a new CVE is published for Cisco IOS XE? stack.watch will email you.

Cisco IOS XE
 

Affected Versions

Cisco IOS XE Software: