CVE-2025-21617 json
Guzzle OAuth Subscriber has insufficient nonce entropy
published 2025-01-06 22 mo ago modified 2026-07-15 3 mo ago also GHSA-237r-r8m4-4q88 , EUVD-2025-0003
- cvss
- 6.3
- version 4.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 41%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- packagist guzzlehttp/oauth-subscriber 0.8.1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 22 mo ago
Exploit prediction
0.48% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 6.3 | CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N |
| CNA | 4.0 | 6.3 | CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | guzzlehttp/oauth-subscriber | <0.8.1 |
0.8.1 |
Affected products
- guzzle oauth-subscriber
Classification
- Weakness
-
- CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
References
-
github.com
/guzzle/oauth-subscriber/commit/92b619b03bd21396e51c62e6bce83467d2ce8f53
web
-
github.com
/guzzle/oauth-subscriber/security/advisories/GHSA-237r-r8m4-4q88
web
-
github.com
/guzzle/oauth-subscriber/blob/0.8.0/src/Oauth1.php#L192
web
-
github.com
/guzzle/oauth-subscriber/releases/tag/0.8.1
web
-
nvd.nist.gov
/vuln/detail/CVE-2025-21617
advisory
-
github.com
/FriendsOfPHP/security-advisories/blob/master/guzzlehttp/oauth-subscriber/CVE-2025-21617.yaml
web
-
github.com
/guzzle/oauth-subscriber
package
Sources
- CVE List CVE-2025-21617
- GitHub Advisory GHSA-237r-r8m4-4q88
- NVD CVE-2025-21617
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