CVE-2025-49506
Apache Portable Runtime Utility: apr_password_validate() vulnerable to timing attack
Description
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.
INFO
Published Date :
Aug. 6, 2026, 3:16 p.m.
Last Modified :
Aug. 7, 2026, 7:44 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2025-49506
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Upgrade APR-util to version 1.6.4.
- Ensure constant-time comparison for password hashes.
- Apply patches if upgrading is not immediately possible.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-49506.
| URL | Resource |
|---|---|
| https://lists.apache.org/thread/2v8o3bj9pb7lfcr57bdnjg9xfkj04mg5 | Mailing List Vendor Advisory |
| http://www.openwall.com/lists/oss-security/2026/08/06/8 | Mailing List Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-49506 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-49506
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-49506 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-49506 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Aug. 07, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:apache:apr-util:*:*:*:*:*:*:*:* versions from (including) 1.2.0 up to (excluding) 1.6.4 Added Reference Type Apache Software Foundation: https://lists.apache.org/thread/2v8o3bj9pb7lfcr57bdnjg9xfkj04mg5 Types: Mailing List, Vendor Advisory Added Reference Type CVE: http://www.openwall.com/lists/oss-security/2026/08/06/8 Types: Mailing List, Third Party Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 06, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Added SSVC {'id': 'CVE-2025-49506', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-06T17:45:19.290280Z'} -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Aug. 06, 2026
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2026/08/06/8 -
New CVE Received by [email protected]
Aug. 06, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Apache Software Foundation', 'product': 'Apache Portable Runtime Utility', 'versions': [{'status': 'affected', 'version': '1.2.0', 'versionType': 'semver', 'lessThanOrEqual': '1.6.3'}], 'packageName': 'APR-util', 'defaultStatus': 'unaffected'}] Added Description 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. Added CWE CWE-208 Added Reference https://lists.apache.org/thread/2v8o3bj9pb7lfcr57bdnjg9xfkj04mg5