CVE-2026-76491: Reachable Assertion in Cisco Cisco TelePresence Video Communication Server (VCS) Expressway
Description
CVE-2026-76491 is a high-severity vulnerability in Cisco TelePresence Video Communication Server (VCS) Expressway involving reachable assertions. The issue was identified during Cisco's internal security review and relates to reachable assertions categorized under CWE-617. The vulnerability has a CVSS score of 7.5 with an impact on availability but no confidentiality or integrity impact. No affected versions or patch information are provided.
CVSS v3.1
Score 7.5high
Affected software
Cisco
Cisco TelePresence Video Communication Server (VCS) Expressway
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Cisco's internal security review discovered multiple vulnerabilities including CVE-2026-76491, which concerns reachable assertions in Cisco TelePresence Video Communication Server (VCS) Expressway software. Reachable assertions (CWE-617) can cause the software to terminate unexpectedly, impacting availability. The CVSS 3.1 vector indicates the vulnerability is remotely exploitable without privileges or user interaction, affecting availability only. No specific affected versions or remediation details are provided in the available data.
Potential Impact
The vulnerability can cause denial of service conditions by triggering reachable assertions that terminate the affected software, impacting availability. There is no impact on confidentiality or integrity. No known exploits are reported in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch or workaround information is provided, users should monitor Cisco advisories for updates and apply any official fixes once available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- cisco
- Date Reserved
- 2026-08-19T12:02:03.640Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ad8e8d64d27ba8daac3b6cf
Added to database: 10/21/2026, 16:31:18 UTC
Last enriched: 10/21/2026, 16:45:45 UTC
Last updated: 10/21/2026, 16:46:20 UTC
Views: 5
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