CVE-2025-21617

Guzzle OAuth Subscriber has insufficient nonce entropy

Description

Guzzle OAuth Subscriber signs Guzzle requests using OAuth 1.0. Prior to 0.8.1, Nonce generation does not use sufficient entropy nor a cryptographically secure pseudorandom source. This can leave servers vulnerable to replay attacks when TLS is not used. This vulnerability is fixed in 0.8.1.

Category

6.3
CVSS
Severity: Medium
CVSS 4.0 •
EPSS 0.10%
Affected: guzzle oauth-subscriber
Published at:
Updated at:

References

Link Tags
https://github.com/guzzle/oauth-subscriber/security/advisories/GHSA-237r-r8m4-4q88
https://github.com/guzzle/oauth-subscriber/commit/92b619b03bd21396e51c62e6bce83467d2ce8f53
https://github.com/guzzle/oauth-subscriber/blob/0.8.0/src/Oauth1.php#L192
https://github.com/guzzle/oauth-subscriber/releases/tag/0.8.1

Frequently Asked Questions

What is the severity of CVE-2025-21617?
CVE-2025-21617 has been scored as a medium severity vulnerability.
How to fix CVE-2025-21617?
To fix CVE-2025-21617, 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-2025-21617 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-21617 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-2025-21617?
CVE-2025-21617 affects guzzle oauth-subscriber.
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