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CVE-2020-35509

UNKNOWN
Published 2022-08-23T15:53:02.000Z
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CVSS Score

V3.1
5.4
/10
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.001
probability
of exploitation in the wild

There is a 0.1% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.294
Higher than 29.4% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED

Impact Metrics

Confidentiality
LOW
Integrity
LOW
Availability
NONE

Description

A flaw was found in keycloak affecting versions 11.0.3 and 12.0.0. An expired certificate would be accepted by the direct-grant authenticator because of missing time stamp validations. The highest threat from this vulnerability is to data confidentiality and integrity.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

✓ GitHub Reviewed MODERATE

Keycloak vulnerable to Improper Certificate Validation

GHSA-rpj2-w6fr-79hc

Advisory Details

keycloak accepts an expired certificate by the direct-grant authenticator because of missing time stamp validations. The highest threat from this vulnerability is to data confidentiality and integrity. This issue was partially fixed in version [13.0.1](https://github.com/keycloak/keycloak/pull/6330) and more completely fixed in version [14.0.0](https://github.com/keycloak/keycloak/pull/8067).

Affected Packages

Maven org.keycloak:keycloak-core
ECOSYSTEM: ≥0 <14.0.0

CVSS Scoring

CVSS Score

5.0

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2020-35509
WEB https://github.com/keycloak/keycloak/pull/6330
WEB https://github.com/keycloak/keycloak/pull/8067
WEB https://github.com/keycloak/keycloak/commit/478319348bdfdb9b6d39122f41edf2af79f679bb
WEB https://access.redhat.com/security/cve/cve-2020-35509
WEB https://bugzilla.redhat.com/show_bug.cgi?id=1912427
PACKAGE https://github.com/keycloak/keycloak
WEB https://github.com/keycloak/keycloak/blob/4f330f4a57cbfcf6202b60546518261c66e59a35/services/src/main/java/org/keycloak/authentication/authenticators/x509/ValidateX509CertificateUsername.java#L74-L76

Advisory provided by GitHub Security Advisory Database. Published: August 24, 2022, Modified: June 30, 2025

References

https://access.redhat.com/security/cve/cve-2020-35509
Published: 2022-08-23T15:53:02.000Z
Last Modified: 2025-06-30T20:17:24.662Z
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