CVE-2026-76490CWE-787

CVE-2026-76490

High · published October 21, 2026

CVSS v3.1
8.6
EPSS
0%
Percentile
26.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.6 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00346 · 26.9th percentile
Weakness
CWE-787 · Out-of-bounds Write
Published
2026-10-21T21:19Z
References (1)
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-exwy-hardening-FhcqBVcs · [email protected]
EPSS history
Timeline
  • 23 OCT 04:07Z
    EPSS moved — → 0%
    epss
  • 21 OCT 16:17Z
    Cisco Expressway Series Software Hardening Release: October 2026 - Out-of-bounds Write Vulnerabilities
    cvelistv5
  • 21 OCT 16:17Z
    Cisco Expressway Series Software Hardening Release: October 2026 - Out-of-bounds Write Vulnerabilities
    cvelistv5