CVE-2025-49506: Apache Portable Runtime Utility: apr_password_validate() vulnerable to timing attack
CSIRTS triage
- What
- The apr_password_validate() function is vulnerable to timing attacks that can leak password information through response time analysis.
- Who is affected
- Applications using Apache APR Utility for password validation, particularly in authentication systems.
- Urgency
- High severity (CVSS 7.5); timing attacks can compromise password security even without direct exploitation reported.
- Action
- Update Apache Portable Runtime Utility to a patched version with constant-time password comparison.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-49506
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2025-495060.38% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 31% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2025-49506 | coverage & exploitation status | NVD · CVE.org |
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