CVE-2026-20277
Received Received - Intake

Protection Mechanism Failure in Cisco IOS XR Software

Publication date: 2026-09-02

Last updated on: 2026-09-02

Assigner: Cisco Systems, Inc.

Description
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20277 are related to protection mechanism failure issues that are grouped under the Common Weakness Enumeration (CWE) CWE-693.

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Meta Information

Published
2026-09-02
Last Modified
2026-09-02
Generated
2026-09-02
AI Q&A
2026-09-02
EPSS Evaluated
N/A
NVD
CVE-2026-20277
EUVD
EUVD-2026-70202

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
cisco ios_xr_software *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-693 The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.

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Executive Summary

CVE-2026-20277 is a vulnerability in Cisco IOS XR Software where protection mechanisms fail, allowing unauthorized modifications or disruptions. It is classified under CWE-693, indicating issues with insufficient protection mechanisms.

Impact Analysis

This vulnerability could allow attackers to bypass security controls, leading to unauthorized access or system disruptions. The CVSS score of 8.2 indicates high impact on integrity and availability.

Mitigation Strategies

Apply the latest Cisco IOS XR Software security updates provided by Cisco to address the protection mechanism failure issues. Monitor Cisco PSIRT advisories for patches and follow their recommended mitigation steps.

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