How severe is CVE-2025-49506?

CVE-2025-49506 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2025-49506 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-49506?

CVE-2025-49506 affects Apache Apr-util. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-49506?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2025-49506 published?

CVE-2025-49506 was published on 2026-08-06 and last updated on 2026-08-07.

CVE-2025-49506

CVE-2025-49506 is a high-severity vulnerability in Apache Apr-util with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-208.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (33rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-208
Affected product: Apache Apr-util
Published: 2026-08-06
Last modified: 2026-08-07

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.

Frequently asked questions

What is 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.
How severe is CVE-2025-49506?: CVE-2025-49506 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2025-49506 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-49506?: CVE-2025-49506 affects Apache Apr-util. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-49506?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2025-49506 published?: CVE-2025-49506 was published on 2026-08-06 and last updated on 2026-08-07.

References

Affected products (1)

cpe:2.3:a:apache:apr-util:*:*:*:*:*:*:*:*

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