Buffer overflow in Cisco Telepresence Video Communication Server (Vcs) Expressway

CVE-2026-76490

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-2026-76490 are related to issues concerning out-of-bounds writes that are grouped under the Common Weakness Enumeration (CWE) Base CWE-787.

Vulnerability class: Buffer Overflow

Published · last modified .

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-76490?
CVE-2026-76490 is a high-severity vulnerability in Cisco Telepresence Video Communication Server (Vcs) Expressway, classified under Out-of-bounds Write. CVSS score: 8.6/10. Published 2026-10-21.
How severe is CVE-2026-76490?
High severity. CVSS v3 base score is 8.6 out of 10.