CVE-2026-76500 Cisco CVE debrief

Who should care

Defenders managing Cisco APIC deployments, especially those with versions listed as affected, should verify exposure and apply recommended patches or mitigations. This includes reviewing inventory for affected APIC versions, monitoring systems for unusual activity, and updating incident response plans to include this vulnerability. Security teams and vulnerability management teams should prioritize this vulnerability due to its critical severity and high-

Why it matters

CVE-2026-76500 is a critical vulnerability in Cisco APIC with a CVSS score of 9.8. Defenders should verify exposure, apply patches, and monitor systems.

• Verify and apply patches to mitigate critical vulnerability.
• Review inventory for affected APIC versions.
• Monitor systems for unusual activity.
• Update incident response plans to include this vulnerability.

Technical summary

CVE-2026-76500 is a critical vulnerability in Cisco Application Policy Infrastructure Controller (APIC) due to improper control of a resource through its lifetime. It has a CVSS score of 9.8 and is tracked under CWE-664. Cisco has listed affected versions and provided a security advisory with patches and mitigations. Defenders should prioritize verifying exposure in their APIC deployments, especially for versions listed as affected by Cisco, and apply patches or mitigations as recommended by the vendor. The vulnerability impacts APIC deployments, and defenders managing these systems should take immediate action.

Defensive priority

Defenders should prioritize verifying exposure in their APIC deployments, especially for versions listed as affected by Cisco, and apply patches or mitigations as recommended by the vendor.

Recommended defensive actions

• Verify APIC deployment versions against Cisco's list of affected versions.
• Apply patches or mitigations recommended by Cisco's security advisory.
• Monitor APIC systems for unusual activity.
• Review and update inventory of APIC deployments.
• Perform compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

Evidence is based on Cisco's security advisory and CVE Program records. Affected versions and patches are detailed in Cisco's advisory. Defenders should verify exposure by reviewing APIC deployment versions against Cisco's list of affected versions. Evidence limits are based on available information from Cisco and the CVE Program. Further verification is recommended.

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.