CVE-2026-76524 Cisco CVE debrief

Who should care

Defenders responsible for Open Source Snort 3 deployments, especially those with local users having low privileges, should assess exposure and prioritize remediation. Defenders should prioritize verifying and remediating this vulnerability in Open Source Snort 3 deployments, especially where local users with low privileges have access to the system.

Why it matters

This vulnerability allows an authenticated, local attacker with low privileges to execute arbitrary commands as the Snort 3 process user, potentially impacting system confidentiality, integrity, and availability. Defenders should prioritize verifying and remediating this vulnerability in Open Source Snort 3 deployments.

• Verify and remediate vulnerable Open Source Snort 3 instances to prevent command execution.
• Monitor systems for suspicious activity indicating potential exploitation.
• Review and restrict local user access and privileges to the Open Source Snort 3 system.
• Assess the impact of successful exploitation on the system's confidentiality, integrity, and availability.

Technical summary

The vulnerability exists in the control channel socket implementation of Open Source Snort 3. An authenticated, local attacker with low privileges can exploit this vulnerability to execute arbitrary commands as the Snort 3 process user. The exploit involves connecting to the Snort 3 control channel socket as a local user. This vulnerability allows an authenticated, local attacker with low privileges to execute arbitrary commands as the Snort 3 process user, potentially impacting system confidentiality, integrity, and availability.

Defensive priority

Defenders should prioritize verifying and remediating this vulnerability in Open Source Snort 3 deployments, especially where local users with low privileges have access to the system.

Recommended defensive actions

• Verify Open Source Snort 3 deployments for exposure, especially where local users have low privileges.
• Remediate vulnerable Open Source Snort 3 instances by applying patches or mitigations.
• Monitor Open Source Snort 3 systems for suspicious activity.
• Review local user access and privileges to the Open Source Snort 3 system.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Evidence notes

The CVE Program record and NVD vulnerability detail provide information on the vulnerability, including its description, CVSS score, and affected products. The vulnerability is due to a lack of authentication when a local user connects to the Snort control channel socket. The CVE Program record was published on 2026-10-21T16:18:12.052Z and has not been modified since then. The NVD vulnerability detail page provides additional information on the vulnerability, including its CVSS score and affected products.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.