6.3

CVE-2025-21617: guzzle oauth-subscriber

CVSS: 6.3v4.0MediumDeferred
Published 06-01-2025Last modified 06-01-2025
Open JSON

Vulnerability summary

CVE-2025-21617 is a medium (CVSS 6.3) vulnerability in guzzle oauth-subscriber. EPSS estimates a 0.48% chance of exploitation in the next 30 days, higher than 40.3% of scored vulnerabilities.

Overall risk
25/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.3/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.48%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 06-01-2025
    PublishedVulnerability first disclosed.
  2. 06-01-2025
    Last modifiedVulnerability information updated.

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.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.48%

Chance of exploitation in the next 30 days

Percentile

40%

Versus all other CVEs

30-day change

+0.02 pp

From 0.46% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.48%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Guzzle1 product

1 vendor · 1 product

References

4 links