CVE-2026-20190: A vulnerability in Cisco ISE and ISE-PIC could allow an unauthenticated, remote attacker to view sensitive inf

This month

HIGH 7.5REMOTEDOWNGRADEDOWNGRADE

CVE-2026-20190 is a high-severity flaw (CVSS 7.5) affecting identity services engine, identity services engine passive identity connector. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability in Cisco ISE and ISE-PIC could allow an unauthenticated, remote attacker to view sensitive information on an affected device. This vulnerability is due to improper authorization checks when a resource is accessed. An attacker could exploit this vulnerability by sending crafted traffic to an affected device. A successful exploit could allow the attacker to gain access to sensitive information, including hashed credentials that c

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 57%)
CISA exploited list	No
Weakness	CWE-285
Published	2026-06-17
Last modified	2026-09-25

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

Last updated 2026-09-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-17 17:16 UTCPublished CVE record published
2026-09-25 16:41 UTCUpdated Record last modified

cisco identity services engine DOWNGRADE

Affected: 3.4.0 · 3.4.0 patch1 · 3.4.0 patch2 · 3.4.0 patch3 · 3.4.0 patch4 · 3.4.0 patch5 · 3.5.0 · 3.5.0 patch1

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.4.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.4.0 (Debian / Ubuntu)

apt-cache madison identity-services-engine sudo apt install identity-services-engine=<VERSION_BEFORE_3.4.0> sudo apt-mark hold identity-services-engine

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list identity-services-engine sudo dnf downgrade identity-services-engine-<VERSION_BEFORE_3.4.0> sudo dnf versionlock add identity-services-engine

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

cisco identity services engine passive identity connector DOWNGRADE

Affected: 3.4.0 · 3.4.0 patch1 · 3.4.0 patch2 · 3.4.0 patch3 · 3.4.0 patch4 · 3.4.0 patch5

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.4.0

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. No fixed release: DOWNGRADE to a release before 3.4.0 (Debian / Ubuntu)

apt-cache madison identity-services-engine-passive-identity-connector sudo apt install identity-services-engine-passive-identity-connector=<VERSION_BEFORE_3.4.0> sudo apt-mark hold identity-services-engine-passive-identity-connector

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list identity-services-engine-passive-identity-connector sudo dnf downgrade identity-services-engine-passive-identity-connector-<VERSION_BEFORE_3.4.0> sudo dnf versionlock add identity-services-engine-passive-identity-connector

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-20190?

identity services engine: downgrade or apply the listed mitigation; identity services engine passive identity connector: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-20190 being exploited?

CVE-2026-20190 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-2026-20190 affect?

CVE-2026-20190 affects identity services engine, identity services engine passive identity connector. Severity is high (CVSS 7.5). A vulnerability in Cisco ISE and ISE-PIC could allow an unauthenticated, remote attacker to view sensitive information on an affected device. This vulnerability is due to improper authorization checks when a resource is accessed. An atta

How urgent is CVE-2026-20190?

Priority 42/100. High severity; Remotely exploitable, no login, no user action

Software pages

Cisco vulnerabilities · Cisco ISE vulnerabilities

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References

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