CVE-2026-76447 Cisco CVE debrief

Who should care

Security teams responsible for Cisco ISE and Cisco ISE-PIC configurations and security updates should assess potential exposure and verify configurations. Teams should review compensating controls, monitor for potential exposure, and apply patches or updates if available. Operators of affected systems must prioritize verification and remediation efforts to prevent exploitation.

Why it matters

CVE-2026-76447 is a medium-severity vulnerability in Cisco ISE and Cisco ISE-PIC that could allow an unauthenticated, remote attacker to cause an administrative reload of the OCSP responder certificate and key material. Security teams should verify configurations and monitor for potential exposure.

• Verification of Cisco ISE and Cisco ISE-PIC configurations for potential exposure
• Potential reload of OCSP responder certificate and key material
• Monitoring OCSP responder logs for suspicious activity
• Applying security updates or patches if available

Technical summary

The vulnerability is due to missing authentication on a function of the OCSP responder in Cisco ISE and Cisco ISE-PIC. An unauthenticated, remote attacker could exploit this by sending a crafted request to cause the OCSP responder to reload certificate and key material on demand. This could allow the attacker to cause an administrative reload of the OCSP responder certificate and key material. Security teams should assess potential exposure and verify configurations to prevent exploitation of Cisco ISE and Cisco ISE-PIC.

Defensive priority

Medium-priority verification of Cisco ISE and Cisco ISE-PIC configurations and updates is recommended.

Recommended defensive actions

• Verify Cisco ISE and Cisco ISE-PIC configurations for potential exposure
• Check for and apply any available security updates or patches
• Monitor OCSP responder logs for suspicious activity
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but additional verification is needed to confirm affected versions and remediation. Security teams should verify configurations, review compensating controls, and monitor for potential exposure. Cisco ISE and Cisco ISE-PIC users must assess potential exposure and apply patches or updates if available.

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.