CVE-2025-49506

HIGH

7.5

CVSS v3

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.

CWE-208

How to fix

Remediation Available

apr-utilDebian

Fixed in:1.6.3-1+deb12u1CVE-2025-49506

Fixed in:1.6.3-3+deb13u1CVE-2025-49506

Fixed in:1.6.4-1CVE-2025-49506

aprRocky

Fixed in:util-main@aarch64RHSA-2026:58474

Fixed in:util-main@x86_64RHSA-2026:58474

Fixed in:util-main@srcRHSA-2026:58474

aprRed Hat / RHEL

Fixed in:util-main@srcRHSA-2026:58474

Fixed in:util-main@x86_64RHSA-2026:58474

Fixed in:util-main@aarch64RHSA-2026:58474

apr-utilRed Hat / RHEL

Fixed in:0:1.6.3-23.el10_2.1RHSA-2026:66392

Fixed in:0:1.6.1-23.el9_8.1RHSA-2026:66341

apr-utilRocky

Fixed in:0:1.6.3-23.el10_2.1RHSA-2026:66392

Fixed in:0:1.6.1-23.el9_8.1RHSA-2026:66341

apr-util-bdbRocky

Fixed in:0:1.6.1-23.el9_8.1RHSA-2026:66341

apr-util-bdbRed Hat / RHEL

Fixed in:0:1.6.1-23.el9_8.1RHSA-2026:66341

apr-util-bdb-debuginfoRocky

Fixed in:0:1.6.1-23.el9_8.1RHSA-2026:66341

apr-util-bdb-debuginfoRed Hat / RHEL

Fixed in:0:1.6.1-23.el9_8.1RHSA-2026:66341

apr-util-debuginfoRocky

Fixed in:0:1.6.3-23.el10_2.1RHSA-2026:66392

Fixed in:0:1.6.1-23.el9_8.1RHSA-2026:66341

apr-util-debuginfoRed Hat / RHEL

Fixed in:0:1.6.3-23.el10_2.1RHSA-2026:66392

Fixed in:0:1.6.1-23.el9_8.1RHSA-2026:66341

apr-util-debugsourceRocky

Fixed in:0:1.6.3-23.el10_2.1RHSA-2026:66392

Fixed in:0:1.6.1-23.el9_8.1RHSA-2026:66341

apr-util-debugsourceRed Hat / RHEL

Fixed in:0:1.6.3-23.el10_2.1RHSA-2026:66392

Fixed in:0:1.6.1-23.el9_8.1RHSA-2026:66341

apr-util-develRed Hat / RHEL

Fixed in:0:1.6.3-23.el10_2.1RHSA-2026:66392

Fixed in:0:1.6.1-23.el9_8.1RHSA-2026:66341

apr-util-develRocky

Fixed in:0:1.6.3-23.el10_2.1RHSA-2026:66392

Fixed in:0:1.6.1-23.el9_8.1RHSA-2026:66341

apr-util-ldapRocky

Fixed in:0:1.6.3-23.el10_2.1RHSA-2026:66392

Fixed in:0:1.6.1-23.el9_8.1RHSA-2026:66341

apr-util-ldapRed Hat / RHEL

Fixed in:0:1.6.3-23.el10_2.1RHSA-2026:66392

Fixed in:0:1.6.1-23.el9_8.1RHSA-2026:66341

apr-util-ldap-debuginfoRed Hat / RHEL

Fixed in:0:1.6.3-23.el10_2.1RHSA-2026:66392

Fixed in:0:1.6.1-23.el9_8.1RHSA-2026:66341

apr-util-ldap-debuginfoRocky

Fixed in:0:1.6.3-23.el10_2.1RHSA-2026:66392

Fixed in:0:1.6.1-23.el9_8.1RHSA-2026:66341

apr-util-lmdbRocky

Fixed in:0:1.6.3-23.el10_2.1RHSA-2026:66392

apr-util-lmdbRed Hat / RHEL

Fixed in:0:1.6.3-23.el10_2.1RHSA-2026:66392

apr-util-lmdb-debuginfoRed Hat / RHEL

Fixed in:0:1.6.3-23.el10_2.1RHSA-2026:66392

apr-util-lmdb-debuginfoRocky

Fixed in:0:1.6.3-23.el10_2.1RHSA-2026:66392

apr-util-mysqlRed Hat / RHEL

Fixed in:0:1.6.3-23.el10_2.1RHSA-2026:66392

Fixed in:0:1.6.1-23.el9_8.1RHSA-2026:66341

apr-util-mysqlRocky

Fixed in:0:1.6.3-23.el10_2.1RHSA-2026:66392

Fixed in:0:1.6.1-23.el9_8.1RHSA-2026:66341

apr-util-mysql-debuginfoRed Hat / RHEL

Fixed in:0:1.6.3-23.el10_2.1RHSA-2026:66392

Fixed in:0:1.6.1-23.el9_8.1RHSA-2026:66341

apr-util-mysql-debuginfoRocky

Fixed in:0:1.6.3-23.el10_2.1RHSA-2026:66392

Fixed in:0:1.6.1-23.el9_8.1RHSA-2026:66341

apr-util-odbcRocky

Fixed in:0:1.6.3-23.el10_2.1RHSA-2026:66392

Fixed in:0:1.6.1-23.el9_8.1RHSA-2026:66341

apr-util-odbcRed Hat / RHEL

Fixed in:0:1.6.3-23.el10_2.1RHSA-2026:66392

Fixed in:0:1.6.1-23.el9_8.1RHSA-2026:66341

apr-util-odbc-debuginfoRocky

Fixed in:0:1.6.3-23.el10_2.1RHSA-2026:66392

Fixed in:0:1.6.1-23.el9_8.1RHSA-2026:66341

This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Exploit Intelligence

0.38%probability of exploitation in 30 days

31stpercentile

Low risk: more likely to be exploited than 31% of all known CVEs.

References

Vendor Advisory1

lists.apache.org

Third-Party Advisory1

openwall.com

Related Vulnerabilities

Other CWE-208 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-9494	Medium	5.9	3.9%	-	Fix
CVE-2019-16782	Medium	6.3	3.7%	-	Fix
CVE-2025-53940	High	8.5	3.2%	-	-
CVE-2020-1926	Medium	5.9	2.5%	-	Fix
CVE-2021-43298	Critical	9.8	2.3%	-	Fix
CVE-2024-29995	High	8.1	1.5%	-	Fix

Common questions

How do I fix CVE-2025-49506?

Published advisories record a fix for 46 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2025-49506 being actively exploited?

Not that we know of. CVE-2025-49506 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.38% is the estimated probability that it will be exploited in the next 30 days. That is higher than 31% of all scored CVEs.

How severe is CVE-2025-49506?

CVE-2025-49506 has a CVSS v3 base score of 7.5, rated important. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2025-49506 affect?

Published advisories record a fix for apr-util (Debian), apr (Rocky), apr (Red Hat / RHEL), apr-util (Red Hat / RHEL), and 42 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-08-07.