CVE-2021-3461

Session persistence via failed SAML backchannel logout

Published Apr 1, 2022 · Updated Aug 3, 2024

Insufficient session expiration in Red Hat Single Sign-On 7.4.7 allows local users to retain access after SAML logout. Red Hat identifies the affected locus as backchannel logout but has not published the code-level operation that fails to terminate the session. The condition requires an external SAML identity provider configured with Attribute [Name] as its Principal Type, leaving the authenticated session usable after logout.

CVSS severity7.1
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Insufficient session expiration in Red Hat Single Sign-On 7.4.7 allows local users to retain access after SAML logout. Red Hat identifies the affected locus as backchannel logout but has not published the code-level operation that fails to terminate the session. The condition requires an external SAML identity provider configured with Attribute [Name] as its Principal Type, leaving the authenticated session usable after logout.

The record

CVE
CVE-2021-3461
Published
Apr 1, 2022
Updated
Aug 3, 2024
Vendor
Red Hat
Product
Red Hat Single Sign-On
Classifications
CWE-613, T1078
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 1, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=rh-sso7-keycloak 9.0.13

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Red Hat · Red Hat Single Sign-Onversion=rh-sso7-keycloak 9.0.13

Published CVSS scores

3.3NIST NVDAV:L/AC:M/Au:N/C:P/I:P/A:N
7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-613Insufficient Session Expiration
T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo