All vulnerabilities
CVE-2026-76491

Cisco Expressway Series Software Hardening Release: October 2026 - Denial of Service Vulnerabilities

Cisco Cisco TelePresence Video Communication Server (VCS) ExpresswayNetwork & edge
Open in ThreatlineRecord JSON
CVSS
7.5High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.26%Chance of exploitation activity in the next 30 days, higher than 17% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published21 Oct 2026Updated 22 Oct 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Reports 1

1 outlet mention it. Reports are not confirmation; each links to its source.

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.

Text from CVE List

Affected versions 30

  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.11.2CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.6CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.11.3CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.2.2CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.8.3CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.11.0CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X12.5.2CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.1.1CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.9CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X12.5.1CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X12.5.6CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.7.3CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X12.6.0CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.11.1CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.5CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.9.1CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.10.2CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.8.2CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.5.3CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.1CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.9.2CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.11.4CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X12.5.4CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.8.1CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.2.1CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.5.1CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.6.1CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.1.2CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.8CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.10.0CVE List

References 1