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.

CVSS v3 8.6 HIGH

8.6^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 4.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope CHANGED

References

Link	Resource
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-exwy-hardening-FhcqBVcs

Configurations

No configuration.

History

21 Oct 2026, 17:19

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-21 17:19

Updated : 2026-10-22 14:17

NVD link : CVE-2026-76490

Mitre link : CVE-2026-76490

CVE.ORG link : CVE-2026-76490

JSON object : View

Products Affected

No product.

CWE

CWE-787

Out-of-bounds Write

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{"status": "affected", "version": "X12.6.1"}, {"status": "affected", "version": "X12.6.2"}, {"status": "affected", "version": "X12.6.3"}, {"status": "affected", "version": "X12.6.4"}, {"status": "affected", "version": "X12.7.0"}, {"status": "affected", "version": "X12.7.1"}, {"status": "affected", "version": "X14.0.0"}, {"status": "affected", "version": "X14.0.1"}, {"status": "affected", "version": "X14.0.2"}, {"status": "affected", "version": "X14.0.3"}, {"status": "affected", "version": "X14.0.4"}, {"status": "affected", "version": "X14.0.5"}, {"status": "affected", "version": "X14.0.6"}, {"status": "affected", "version": "X14.0.7"}, {"status": "affected", "version": "X14.0.8"}, {"status": "affected", "version": "X14.2.0"}, {"status": "affected", "version": "X14.0.9"}, {"status": "affected", "version": "X14.2.1"}, {"status": "affected", "version": "X14.2.2"}, {"status": "affected", "version": "X14.0.11"}, {"status": "affected", "version": "X14.2.5"}, {"status": "affected", "version": "X14.0.10"}, {"status": "affected", "version": "X14.2.6"}, {"status": "affected", "version": "X14.2.7"}, {"status": "affected", "version": "X14.3.0"}, {"status": "affected", "version": "X14.3.1"}, {"status": "affected", "version": "X14.3.2"}, {"status": "affected", "version": "X14.3.3"}, {"status": "affected", "version": "X15.0.0"}, {"status": "affected", "version": "X14.3.4"}, {"status": "affected", "version": "X14.3.5"}, {"status": "affected", "version": "X15.0.1"}, {"status": "affected", "version": "X15.0.2"}, {"status": "affected", "version": "X15.0.3"}, {"status": "affected", "version": "X14.3.6"}, {"status": "affected", "version": "X15.2.0"}, {"status": "affected", "version": "X15.2.1"}, {"status": "affected", "version": "X15.2.2"}, {"status": "affected", "version": "X15.2.3"}, {"status": "affected", "version": "X14.3.7"}, {"status": "affected", "version": "X15.2.4."}, {"status": "affected", "version": "X15.2.4"}, {"status": "affected", "version": "X15.3.0"}, {"status": "affected", "version": "X15.3.1"}, {"status": "affected", "version": "X15.3.2"}, {"status": "affected", "version": "X15.4.0"}, {"status": "affected", "version": "X15.5.0"}, {"status": "affected", "version": "X15.5.1"}, {"status": "affected", "version": "X15.5.2"}], "defaultStatus": "unknown"}]}], "published": "2026-10-21T17:19:08.340", "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-exwy-hardening-FhcqBVcs", "source": "psirt@cisco.com"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "psirt@cisco.com", "description": [{"lang": "en", "value": "CWE-787"}]}], "descriptions": [{"lang": "en", "value": "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.  \r\n\r\nThe 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."}], "lastModified": "2026-10-22T14:17:47.227", "sourceIdentifier": "psirt@cisco.com"}