CVE-2025-53537

Name: CVE-2025-53537
Creator: NVD / NIST
Published: 2025-07-23T21:15:26.613+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.42%

Last modified Jun 17, 2026

CVE-2025-53537 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. LibHTP is a security-aware parser for the HTTP protocol and its related bits and pieces. In versions 0.5.50 and below, there is a traffic-induced memory leak that can starve the process of memory, leading to loss of visibility. EPSS estimates a 0.42% chance of exploitation in the next 30 days.

Description

LibHTP is a security-aware parser for the HTTP protocol and its related bits and pieces. In versions 0.5.50 and below, there is a traffic-induced memory leak that can starve the process of memory, leading to loss of visibility. To workaround this issue, set `suricata.yaml app-layer.protocols.http.libhtp.default-config.lzma-enabled` to false. This issue is fixed in version 0.5.51.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.42%

33.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-401

Affected Software

Vendor	Product	Versions
Oisf	Libhtp	< 0.5.51

References

https://github.com/OISF/libhtp/commit/9037ea35110a0d97be5cedf8d31fb4cd9a38c7a7Patch
https://github.com/OISF/libhtp/security/advisories/GHSA-v3qq-h8mh-vph7Mitigation, Vendor Advisory

Timeline

Published: Jul 23, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-53537?

How severe is CVE-2025-53537?

CVE-2025-53537 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.42% probability of exploitation in the next 30 days.

How do I fix CVE-2025-53537?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-53537?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST