Vulnerability in Apache Apr-Util
CVE-2025-49506
APR-util versions 1.6.3 (and earlier) function apr_password_validate() was not constant-time with regards to hashes or passwords comparisons, potentially leaking their content via a side channel timing attack particularly on platforms without crypt() such as Windows, BeOS, NetWare, or Android. Users are recommended to upgrade to version 1.6.4, which fixes this issue.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (32.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 32.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Apache Apr-Util
- Apache Software Foundation Portable Runtime Utility — versions 1.2.0
Weakness classification (CWE)
References
- lists.apache.org/thread/2v8o3bj9pb7lfcr57bdnjg9xfkj04mg5 (vendor-advisory, Mailing List, Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2025-49506?
- CVE-2025-49506 is a high-severity vulnerability in Apache Apr-Util, classified under CWE-208. CVSS score: 7.5/10. Published 2026-08-06.
- How severe is CVE-2025-49506?
- High severity. CVSS v3 base score is 7.5 out of 10.