CVE-2026-76490
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Out-of-Bounds Write in Cisco Expressway Series

Publication date: 2026-10-21

Last updated on: 2026-11-07

Assigner: Cisco Systems, Inc.

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.

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Meta Information

Published
2026-10-21
Last Modified
2026-11-07
Generated
2026-11-10
AI Q&A
2026-10-22
EPSS Evaluated
2026-11-09
NVD
CVE-2026-76490
EUVD
EUVD-2026-107353

Affected Vendors & Products

Showing 93 associated CPEs
Vendor Product Version / Range
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.11.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.6
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.11.3
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.2.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.8.3
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.11.0
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.5.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.1.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.9
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.5.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.5.6
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.7.3
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.6.0
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.11.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.5
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.9.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.10.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.8.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.5.3
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.9.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.11.4
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.5.4
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.8.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.2.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.5.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.6.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.1.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.8
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.10.0
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.5.3
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.10.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.5.7
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.10.3
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.7.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.5.8
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.7
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.5.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.5.9
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.5.0
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.10.4
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.7.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.5.5
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.6.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.6.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.6.3
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.6.4
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.7.0
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X12.7.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.0
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.3
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.4
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.5
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.6
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.7
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.8
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.2.0
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.9
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.2.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.2.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.11
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.2.5
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.10
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.2.6
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.2.7
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.3.0
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.3.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.3.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.3.3
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.0.0
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.3.4
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.3.5
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.0.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.0.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.0.3
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.3.6
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.2.0
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.2.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.2.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.2.3
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X14.3.7
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.2.4.
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.2.4
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.3.0
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.3.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.3.2
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.4.0
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.5.0
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.5.1
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X15.5.2

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-787 The product writes data past the end, or before the beginning, of the intended buffer.

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Executive Summary

CVE-2026-76490 involves out-of-bounds write vulnerabilities in Cisco Expressway Series software. These flaws occur when software writes data outside the intended memory buffer, potentially allowing attackers to execute arbitrary code or cause system crashes.

Impact Analysis

This vulnerability could lead to denial of service, unauthorized code execution, or data corruption on affected Cisco Expressway Series systems. Attackers might exploit it remotely without authentication to disrupt services or gain control of vulnerable devices.

Mitigation Strategies

Apply the latest security patches or updates provided by Cisco for the Expressway Series software to address the out-of-bounds write vulnerabilities.

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