CVE-2025-49506Network attack vector

Credential inference via variable-time password validation

Published Aug 6, 2026 · Updated Aug 6, 2026

Observable timing discrepancies in Apache Portable Runtime Utility 1.2.0 through 1.6.3 allow remote attackers to infer password data. The apr_password_validate() function compares supplied passwords and computed hashes without constant-time operations, exposing input-dependent response timing. The side channel is most exposed on platforms without crypt(), including Windows and Android; network jitter creates practical barriers to extracting secrets remotely.

CVSS severity7.5
High
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Observable timing discrepancies in Apache Portable Runtime Utility 1.2.0 through 1.6.3 allow remote attackers to infer password data. The apr_password_validate() function compares supplied passwords and computed hashes without constant-time operations, exposing input-dependent response timing. The side channel is most exposed on platforms without crypt(), including Windows and Android; network jitter creates practical barriers to extracting secrets remotely.

The record

CVE
CVE-2025-49506
Published
Aug 6, 2026
Updated
Aug 6, 2026
Vendor
The Apache Software Foundation
Product
Apache Portable Runtime Utility
Classifications
CWE-208, T1555
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.2.0 <=1.6.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Portable Runtime Utilityversion=1.2.0 <=1.6.3

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-208Observable Timing Discrepancy
T1555Credentials from Password Stores

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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