How severe is CVE-2025-61581?

CVE-2025-61581 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 none, integrity none, and availability high.

Is CVE-2025-61581 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-61581?

CVE-2025-61581 affects Apache Traffic Control. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-61581?

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.

Does CVE-2025-61581 have an EU (EUVD) identifier?

Yes. CVE-2025-61581 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-34739.

When was CVE-2025-61581 published?

CVE-2025-61581 was published on 2025-10-16 and last updated on 2026-06-17.

CVE-2025-61581

CVE-2025-61581 is a high-severity vulnerability in Apache Traffic Control 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-1333.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-34739
Weakness: CWE-1333
Affected product: Apache Traffic Control
Published: 2025-10-16
Last modified: 2026-06-17

Description

** UNSUPPORTED WHEN ASSIGNED ** Inefficient Regular Expression Complexity vulnerability in Apache Traffic Control. This issue affects Apache Traffic Control: all versions. People with access to the management interface of the Traffic Router component could specify malicious patterns and cause unavailability. As this project is retired, we do not plan to release a version that fixes this issue. Users are recommended to find an alternative or restrict access to the instance to trusted users. NOTE: This vulnerability only affects products that are no longer supported by the maintainer.

Frequently asked questions

What is CVE-2025-61581?: ** UNSUPPORTED WHEN ASSIGNED ** Inefficient Regular Expression Complexity vulnerability in Apache Traffic Control. This issue affects Apache Traffic Control: all versions. People with access to the management interface of the Traffic Router component could specify malicious patterns and cause unavailability. As this project is retired, we do not plan to release a version that fixes this issue. Users are recommended to find an alternative or restrict access to the instance to trusted users. NOTE: This vulnerability only affects products that are no longer supported by the maintainer.
How severe is CVE-2025-61581?: CVE-2025-61581 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 none, integrity none, and availability high.
Is CVE-2025-61581 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-61581?: CVE-2025-61581 affects Apache Traffic Control. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-61581?: 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.
Does CVE-2025-61581 have an EU (EUVD) identifier?: Yes. CVE-2025-61581 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-34739.
When was CVE-2025-61581 published?: CVE-2025-61581 was published on 2025-10-16 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:apache:traffic_control:*:*:*:*:*:*:*:*

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CVE-2022-23206 — High (CVSS 7.5): In Apache Traffic Control Traffic Ops prior to 6.1.0 or 5.1.6, an unprivileged user who can reach Traffic Ops over…
CVE-2017-7670 — High (CVSS 7.5): The Traffic Router component of the incubating Apache Traffic Control project is vulnerable to a Slowloris style Denial…
CVE-2020-17522 — Medium (CVSS 5.8): When ORT (now via atstccfg) generates ip_allow.config files in Apache Traffic Control 3.0.0 to 3.1.0 and 4.0.0 to…

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