Back to Database
Status published
Medium
CVE-2025-21617
Guzzle OAuth Subscriber has insufficient nonce entropy
Vulnerability 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.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
THREAT MONITOR
Am I Vulnerable?
Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2025-21617
Credits & Attribution
No credits recorded in the NVD database.
References
- 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
More from guzzle
View All →CVE-2023-29197
Improper header name validation in guzzlehttp/psr7
Medium
5.3
CVE-2022-31091
Change in port should be considered a change in origin in Guzzle
High
7.7
CVE-2022-31090
CURLOPT_HTTPAUTH option not cleared on change of origin in Guzzle
High
7.7
CVE-2022-31043
Fix failure to strip Authorization header on HTTP downgrade in Guzzle
High
7.5
CVE-2022-31042
Failure to strip the Cookie header on change in host or HTTP downgrade in Guzzle
High
7.5
Affected Vendor
guzzle
View all reports →Affected Software
oauth-subscriber
Vulnerable Versions:
< 0.8.1
Timeline
Official Publish:
January 6th, 2025
Last Modified:
January 6th, 2025
Added to House:
July 22nd, 2026
CVSS Vectors
Weaknesses (CWE)
MITRE ATT&CK TTPs
No associated TTPs found for this vulnerability.