Is CVE-2025-1861 actively exploited?

No active exploitation of CVE-2025-1861 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2025-1861 be exploited remotely?

Yes. CVE-2025-1861 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2025-1861?

CVE-2025-1861 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2025-1861

CWE-131Published: March 30, 2025· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

In PHP from 8.1.* before 8.1.32, from 8.2.* before 8.2.28, from 8.3.* before 8.3.19, from 8.4.* before 8.4.5, when parsing HTTP redirect in the response to an HTTP request, there is currently limit on the location value size caused by limited size of the location buffer to 1024. However as per RFC9110, the limit is recommended to be 8000. This may lead to incorrect URL truncation and redirecting to a wrong location.

NVD Source

Technical Analysis

CVE-2025-1861 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.