Medium severity · published Mar 3, 2025
CVE-2025-27371
In certain IETF OAuth 2.0-related specifications, when the JSON Web Token Profile for OAuth 2.0 Client Authentication mechanism is used, there are ambiguities in the audience…
6.9
CVSS
0.3%
EPSS
No
On KEV
Description
In certain IETF OAuth 2.0-related specifications, when the JSON Web Token Profile for OAuth 2.0 Client Authentication mechanism is used, there are ambiguities in the audience values of JWTs sent to authorization servers. The affected RFCs may include RFC 7523, and also RFC 7521, RFC 7522, RFC 9101 (JAR), and RFC 9126 (PAR).
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
High
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 28% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
R7
RFC 7523 · IETF
7523 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-27371
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-27371
eprint.iacr.org
https://eprint.iacr.org/2025/629
github.com
https://github.com/OWASP/ASVS/issues/2678
openid.net
https://openid.net/notice-of-a-security-vulnerability/
openid.net
https://openid.net/wp-content/uploads/2025/01/OIDF-Responsible-Disclosure-Notice-on-Security-Vulnerability-for-private_key_jwt.pdf
talks.secworkshop.events
https://talks.secworkshop.events/osw2025/talk/R8D9BS/