CVE-2026-76447 Cisco CVE debrief

Who should care

Defenders responsible for Cisco ISE and Cisco ISE-PIC deployments should assess exposure and verify configurations to prevent potential reloads of the OCSP responder certificate and key material.

Why it matters

CVE-2026-76447 allows unauthenticated remote attackers to cause OCSP responder certificate and key material reload in Cisco ISE and Cisco ISE-PIC. Defenders should verify configurations and update affected products to prevent potential security consequences.

• Verify and update Cisco ISE and Cisco ISE-PIC to prevent potential reloads
• Review and implement secure configuration and authentication for the OCSP responder
• Monitor for potential crafted requests to the OCSP responder

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 vulnerability by sending a crafted request to an affected device, potentially causing the OCSP responder to reload certificate and key material on demand. Defenders should prioritize verifying and updating Cisco ISE and Cisco ISE-PIC to prevent potential reloads of the OCSP responder certificate and key material. This vulnerability has a CVSS score of 5.3 and is considered MEDIUM severity.

Defensive priority

Defenders should prioritize verifying and updating Cisco ISE and Cisco ISE-PIC to prevent potential reloads of the OCSP responder certificate and key material.

Recommended defensive actions

• Verify and update Cisco ISE and Cisco ISE-PIC to the latest version
• Review and implement secure configuration and authentication for the OCSP responder
• Monitor for potential crafted requests to the OCSP responder
• Review 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
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD vulnerability detail provide information on the vulnerability, including its description, CVSS score, and affected products. Defenders should verify configurations and review potential reloads of the OCSP responder certificate and key material. Evidence is limited to public sources, and defenders should exercise caution when assessing exposure.

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.