7.5

CVE-2025-53537: oisf libhtp

CVSS: 7.5v3.1HighAnalyzed
AliasesUBUNTU-CVE-2025-53537DEBIAN-CVE-2025-53537
Published 23-07-2025Last modified 23-07-2025
Open JSON

Vulnerability summary

CVE-2025-53537 is a high (CVSS 7.5) vulnerability in oisf libhtp. EPSS estimates a 0.47% chance of exploitation in the next 30 days, higher than 39.4% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.47%
0%100%
Low · +0.05 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
USN-7814-1

Timeline

  1. 23-07-2025
    PublishedVulnerability first disclosed.
  2. 23-07-2025
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.47%

Chance of exploitation in the next 30 days

Percentile

39%

Versus all other CVEs

30-day change

+0.05 pp

From 0.42% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.47%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • libhtp< 1:0.5.50-1+deb13u1
Oisf1 product
Ubuntu1 product
  • libhtp< 0.5.15-1ubuntu0.1~esm1 | < 1:0.5.26-1ubuntu0.1~esm1 | < 1:0.5.32-1ubuntu0.1~esm1 | < 1:0.5.39-1ubuntu0.1~esm1 | < 1:0.5.46-1ubuntu2+esm1 | All versions (No fix recorded)

3 vendors · 3 products

References

6 links