CVE-2026-76490: Out-of-bounds Write in Cisco Cisco TelePresence Video Communication Server (VCS) Expressway
Description
CVE-2026-76490 is a high-severity vulnerability in Cisco TelePresence Video Communication Server (VCS) Expressway involving an out-of-bounds write. This vulnerability was identified during Cisco's internal security review and is classified under CWE-787. It has a CVSS 3.1 base score of 8.6, indicating a network exploitable flaw that requires no privileges or user interaction but can cause a significant availability impact. No affected versions or patch information are provided in the current data.
CVSS v3.1
Score 8.6high
Affected software
Cisco
Cisco TelePresence Video Communication Server (VCS) Expressway
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Cisco TelePresence Video Communication Server (VCS) Expressway contains an out-of-bounds write vulnerability (CVE-2026-76490) discovered during an internal security review. This vulnerability is categorized under CWE-787 and can be exploited remotely without authentication or user interaction. The CVSS 3.1 score of 8.6 reflects a high severity with a critical impact on availability. No specific affected versions or remediation details are available in the provided information.
Potential Impact
The vulnerability allows an unauthenticated attacker to cause an out-of-bounds write remotely, potentially leading to denial of service or system instability. There is no indication of confidentiality or integrity impact. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch or workaround information is provided, monitoring Cisco's official advisories for updates and applying any forthcoming security updates promptly is recommended.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- cisco
- Date Reserved
- 2026-08-19T12:02:03.640Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ad8e8d64d27ba8daac3b6cd
Added to database: 10/21/2026, 16:31:18 UTC
Last enriched: 10/21/2026, 16:45:51 UTC
Last updated: 10/21/2026, 16:46:20 UTC
Views: 5
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.