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High severity · published Oct 21, 2026
CVE-2026-76490
Cisco Expressway Series Software Hardening Release: October 2026 - Out-of-bounds Write Vulnerabilities
New
8.6
CVSS
0.4%
EPSS
No
On KEV
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-2026-76490 are related to issues concerning out-of-bounds writes that are grouped under the Common Weakness Enumeration (CWE) Base CWE-787.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 38% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CT
Cisco TelePresence Video Communication Server (VCS) Expressway · Cisco
X8.11.2; X8.6; X8.11.3; X8.2.2; X8.8.3; X8.11.0; +34 more · source: vendor
Affected product
CT
Cisco TelePresence Video Communication Server (VCS) Expressway
Cisco
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-76490
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-76490
sec.cloudapps.cisco.com
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-exwy-hardening-FhcqBVcs
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