CVE-2026-76491
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Reachable Assertion Vulnerability in Cisco Expressway Series

Vulnerability report for CVE-2026-76491, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.

Publication date: 2026-10-21

Last updated on: 2026-11-07

Assigner: Cisco Systems, Inc.

Description

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Expressway Series 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-2026-76491 are related to issues concerning reachable assertions that are grouped under the Common Weakness Enumeration (CWE) Base CWE-617.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-10-21
Last Modified
2026-11-07
Generated
2026-11-10
AI Q&A
2026-10-22
EPSS Evaluated
2026-11-09
NVD
EUVD

Affected Vendors & Products

Showing 94 associated CPEs
Vendor Product Version / Range
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.11.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.6
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.11.3
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.2.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.8.3
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.11.0
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.5.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.1.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.9
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.5.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.5.6
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.7.3
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.6.0
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.11.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.5
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.9.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.10.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.8.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.5.3
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.9.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.11.4
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.5.4
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.8.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.2.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.5.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.6.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.1.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.8
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.10.0
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.5.3
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.10.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.5.7
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.10.3
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.7.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.5.8
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.7
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.5.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.5.9
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.5.0
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.10.4
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.7.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.5.5
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.6.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.6.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.6.3
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.6.4
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.7.0
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.7.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.0
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.3
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.4
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.5
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.6
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.7
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.8
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.2.0
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.9
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.2.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.2.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.11
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.2.5
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.10
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.2.6
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.2.7
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.3.0
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.3.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.3.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.3.3
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.0.0
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.3.4
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.3.5
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.0.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.0.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.0.3
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.3.6
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.2.0
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.2.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.2.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.2.3
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.3.7
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.2.4.
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.2.4
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.3.0
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.3.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.3.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.4.0
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.5.0
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.5.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.5.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.5.3

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-617 The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.

Attack-Flow Graph

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Executive Summary

CVE-2026-76491 is a vulnerability in Cisco Expressway Series software related to reachable assertions, classified under CWE-617. It was discovered during Cisco's internal security review and is part of a broader set of vulnerabilities addressed in a software hardening release.

Impact Analysis

This vulnerability could allow an attacker to cause a denial of service condition on affected Cisco Expressway Series devices. The high CVSS score indicates significant potential impact, though no active exploitation is currently known.

Mitigation Strategies
  • Upgrade to the fixed software release provided by Cisco for Cisco Expressway-C and Expressway-E devices as soon as possible.
  • Monitor Cisco's security advisories for updates and apply patches promptly.

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