CVE-2026-76491
Cisco Expressway Series Software Hardening Release: October 2026 - Denial of Service Vulnerabilities
- Published
- Updated
- Reserved
- Assigned by
- cisco
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| ciscoCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Awaiting Analysis | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.36% · top 70% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Weakness
Affected products
Cisco · Cisco TelePresence Video Communication Server (VCS) Expressway
- affected X8.11.2
- affected X8.6
- affected X8.11.3
- affected X8.2.2
- affected X8.8.3
- affected X8.11.0
- affected X12.5.2
- affected X8.1.1
- affected X8.9
- affected X12.5.1
- affected X12.5.6
- affected X8.7.3
- affected X12.6.0
- affected X8.11.1
- affected X8.5
- affected X8.9.1
- affected X8.10.2
- affected X8.8.2
- affected X8.5.3
- affected X8.1
- affected X8.9.2
- affected X8.11.4
- affected X12.5.4
- affected X8.8.1
- affected X8.2.1
- affected X8.5.1
- affected X8.6.1
- affected X8.1.2
- affected X8.8
- affected X8.10.0
- affected X12.5.3
- affected X8.10.1
- affected X12.5.7
- affected X8.10.3
- affected X8.7.1
- affected X8.2
- affected X12.5.8
- affected X8.7
- affected X8.5.2
- affected X12.5.9
- and 54 more
What to do
Exploitation: The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.
References (1)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-76491)Record last updated .