CVE-2025-61581Network attack vector

Authenticated service interruption via malicious regex patterns

Published Oct 16, 2025 · Updated Oct 16, 2025

Inefficient regex complexity in all versions of Apache Traffic Control allows remote authenticated users to interrupt Traffic Router service. The management interface accepts attacker-specified patterns that trigger excessive regular-expression processing; Apache has not disclosed the exact field or code path. Reachability requires management-interface access, and exploitation interrupts availability without reported data disclosure or modification.

CVSS severity7.5
High
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Inefficient regex complexity in all versions of Apache Traffic Control allows remote authenticated users to interrupt Traffic Router service. The management interface accepts attacker-specified patterns that trigger excessive regular-expression processing; Apache has not disclosed the exact field or code path. Reachability requires management-interface access, and exploitation interrupts availability without reported data disclosure or modification.

The record

CVE
CVE-2025-61581
Published
Oct 16, 2025
Updated
Oct 16, 2025
Vendor
The Apache Software Foundation
Product
Apache Traffic Control
Classifications
CWE-1333, CAPEC-492, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 16, 2025Record 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=0 <*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Apache Software Foundation · Apache Traffic Controlversion=0 <*

Published CVSS scores

7.5CISA ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
1.3GitHub Security AdvisoryCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1333Inefficient Regular Expression Complexity
CAPEC-492Regular Expression Exponential Blowup
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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