CVE-2025-49506: CWE-208 Observable Timing Discrepancy in Apache Software Foundation Apache Portable Runtime Utility
CVE-2025-49506 is a timing side-channel vulnerability in the Apache Portable Runtime Utility (APR-util) affecting versions up to and including 1.6.3. The apr_password_validate() function did not perform password or hash comparisons in constant time, potentially allowing attackers to infer sensitive information via timing discrepancies on platforms lacking the crypt() function, such as Windows, BeOS, NetWare, or Android. The issue is fixed in version 1.6.4.
AI Analysis
Technical Summary
The vulnerability in APR-util versions up to 1.6.3 involves the apr_password_validate() function, which compares passwords and hashes in a non-constant-time manner. This behavior can leak information through timing side channels, especially on platforms without the crypt() function. This flaw is classified under CWE-208 (Observable Timing Discrepancy). Users are advised to upgrade to APR-util version 1.6.4 where this issue has been addressed.
Potential Impact
An attacker could potentially exploit the timing discrepancy to infer password or hash contents, leading to information disclosure. The vulnerability does not impact integrity or availability but poses a confidentiality risk. The CVSS score of 7.5 (high) reflects the network attack vector, low complexity, no privileges required, no user interaction, and high confidentiality impact.
Mitigation Recommendations
Users should upgrade to APR-util version 1.6.4, which fixes the timing discrepancy issue in apr_password_validate(). No other mitigations are indicated. Patch status is confirmed by the recommendation to upgrade to 1.6.4.
CVE-2025-49506: CWE-208 Observable Timing Discrepancy in Apache Software Foundation Apache Portable Runtime Utility
Description
CVE-2025-49506 is a timing side-channel vulnerability in the Apache Portable Runtime Utility (APR-util) affecting versions up to and including 1.6.3. The apr_password_validate() function did not perform password or hash comparisons in constant time, potentially allowing attackers to infer sensitive information via timing discrepancies on platforms lacking the crypt() function, such as Windows, BeOS, NetWare, or Android. The issue is fixed in version 1.6.4.
CVSS v3.1
Score 7.5high
Affected software
Apache Software Foundation
Apache Portable Runtime Utility
pkg:maven/org.apache.apr/apr-utilRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in APR-util versions up to 1.6.3 involves the apr_password_validate() function, which compares passwords and hashes in a non-constant-time manner. This behavior can leak information through timing side channels, especially on platforms without the crypt() function. This flaw is classified under CWE-208 (Observable Timing Discrepancy). Users are advised to upgrade to APR-util version 1.6.4 where this issue has been addressed.
Potential Impact
An attacker could potentially exploit the timing discrepancy to infer password or hash contents, leading to information disclosure. The vulnerability does not impact integrity or availability but poses a confidentiality risk. The CVSS score of 7.5 (high) reflects the network attack vector, low complexity, no privileges required, no user interaction, and high confidentiality impact.
Mitigation Recommendations
Users should upgrade to APR-util version 1.6.4, which fixes the timing discrepancy issue in apr_password_validate(). No other mitigations are indicated. Patch status is confirmed by the recommendation to upgrade to 1.6.4.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apache
- Date Reserved
- 2025-06-06T09:23:28.146Z
- State
- PUBLISHED
Threat ID: 6a749d33bf8831d539db9d17
Added to database: 08/06/2026, 14:41:55 UTC
Last enriched: 08/13/2026, 17:00:04 UTC
Last updated: 09/21/2026, 22:01:30 UTC
Views: 57
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