CVE-2026-76447: A vulnerability in the Online Certificate Status Protocol (OCSP) responder of Cisco ISE and Cisco ISE-PIC coul

Q: How do I fix CVE-2026-76447?

identity services engine passive identity connector: upgrade to 3.3.0; identity services engine: upgrade to 3.3.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-76447 being exploited?

CVE-2026-76447 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-76447 affect?

CVE-2026-76447 affects identity services engine passive identity connector, identity services engine. Severity is medium (CVSS 5.3). A vulnerability in the Online Certificate Status Protocol (OCSP) responder of Cisco ISE and Cisco ISE-PIC could allow an unauthenticated, remote attacker to cause an administrative reload of the OCSP responder certificate and key material.

Q: How urgent is CVE-2026-76447?

Priority 31/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.3REMOTEUPGRADEUPGRADE

CVE-2026-76447 is a medium-severity flaw (CVSS 5.3) affecting identity services engine passive identity connector, identity services engine. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability in the Online Certificate Status Protocol (OCSP) responder of Cisco ISE and Cisco ISE-PIC could allow an unauthenticated, remote attacker to cause an administrative reload of the OCSP responder certificate and key material. This vulnerability is due to missing authentication on a function of the OCSP responder. An attacker could exploit this vulnerability by sending a crafted request to an affected device. A successful exploit

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-306
Published	2026-09-16
Last modified	2026-09-28

Publisher (CNA): Cisco Systems, Inc. · Vendor: cisco

Last updated 2026-09-28 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-16 21:17 UTCPublished CVE record published
2026-09-28 13:09 UTCUpdated Record last modified

cisco identity services engine passive identity connector UPGRADE

Affected: < 3.3.0 · 3.3.0 patch1 · 3.3.0 patch10 · 3.3.0 patch11 · 3.3.0 patch2 · 3.3.0 patch3 · 3.3.0 patch4 · 3.3.0 patch5

Fixed in: 3.3.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy identity-services-engine-passive-identity-connector || rpm -q identity-services-engine-passive-identity-connector || identity-services-engine-passive-identity-connector --version

2. UPGRADE to 3.3.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade identity-services-engine-passive-identity-connector

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade identity-services-engine-passive-identity-connector

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

cisco identity services engine UPGRADE

Affected: < 3.3.0 · 3.3.0 patch1 · 3.3.0 patch10 · 3.3.0 patch11 · 3.3.0 patch2 · 3.3.0 patch3 · 3.3.0 patch4 · 3.3.0 patch5

Fixed in: 3.3.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy identity-services-engine || rpm -q identity-services-engine || identity-services-engine --version

2. UPGRADE to 3.3.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade identity-services-engine

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade identity-services-engine

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Advisories and coverage

Official advisories

Cisco Security Advisories: Cisco Identity Services Engine Authentication Bypass Vulnerabilities 2026-09-24

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-76447?

identity services engine passive identity connector: upgrade to 3.3.0; identity services engine: upgrade to 3.3.0. Exact commands for each OS are on this page.

Is CVE-2026-76447 being exploited?

CVE-2026-76447 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-76447 affect?

CVE-2026-76447 affects identity services engine passive identity connector, identity services engine. Severity is medium (CVSS 5.3). A vulnerability in the Online Certificate Status Protocol (OCSP) responder of Cisco ISE and Cisco ISE-PIC could allow an unauthenticated, remote attacker to cause an administrative reload of the OCSP responder certificate and key material.

How urgent is CVE-2026-76447?

Priority 31/100. Remotely exploitable, no login, no user action

Software pages

Cisco vulnerabilities · Cisco ISE vulnerabilities

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References

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