CVE-2025-27371

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).

Category

6.9
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.07%
Affected: IETF RFC 7523
Published at:
Updated at:

References

Link Tags
https://openid.net/wp-content/uploads/2025/01/OIDF-Responsible-Disclosure-Notice-on-Security-Vulnerability-for-private_key_jwt.pdf
https://openid.net/notice-of-a-security-vulnerability/
https://talks.secworkshop.events/osw2025/talk/R8D9BS/
https://github.com/OWASP/ASVS/issues/2678
https://eprint.iacr.org/2025/629

Frequently Asked Questions

What is the severity of CVE-2025-27371?
CVE-2025-27371 has been scored as a medium severity vulnerability.
How to fix CVE-2025-27371?
To fix CVE-2025-27371, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-27371 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-27371 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-27371?
CVE-2025-27371 affects IETF RFC 7523.
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