CVE-2024-28871: LibHTP is a security-aware parser for the HTTP protocol and the related bits and pieces

This month

HIGH 7.5REMOTEDOWNGRADE

CVE-2024-28871 is a high-severity flaw (CVSS 7.5) affecting libhtp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

LibHTP is a security-aware parser for the HTTP protocol and the related bits and pieces. Version 0.5.46 may parse malformed request traffic, leading to excessive CPU usage. Version 0.5.47 contains a patch for the issue. No known workarounds are available.

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 42%)
CISA exploited list	No
Weakness	CWE-770
Published	2024-04-04
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: oisf

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-04-04 15:15 UTCPublished CVE record published
2026-06-17 07:21 UTCUpdated Record last modified

oisf libhtp DOWNGRADE

Affected: 0.5.46

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.5.46

1. Check installed version

apt-cache policy libhtp || rpm -q libhtp || libhtp --version

2. No fixed release: DOWNGRADE to a release before 0.5.46 (Debian / Ubuntu)

apt-cache madison libhtp sudo apt install libhtp=<VERSION_BEFORE_0.5.46> sudo apt-mark hold libhtp

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list libhtp sudo dnf downgrade libhtp-<VERSION_BEFORE_0.5.46> sudo dnf versionlock add libhtp

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-28871?

libhtp: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2024-28871 being exploited?

CVE-2024-28871 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-28871 affect?

CVE-2024-28871 affects libhtp. Severity is high (CVSS 7.5). LibHTP is a security-aware parser for the HTTP protocol and the related bits and pieces. Version 0.5.46 may parse malformed request traffic, leading to excessive CPU usage. Version 0.5.47 contains a patch for the issue. No known workarounds

How urgent is CVE-2024-28871?

Priority 46/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-53537 HIGH 7.5 UPGRADE LibHTP is a security-aware parser for the HTTP protocol and its related bits and pieces
CVE-2024-45797 HIGH 7.5 UPGRADE LibHTP is a security-aware parser for the HTTP protocol and the related bits and pieces
CVE-2024-23837 HIGH 7.5 UPGRADE MITIGATE LibHTP is a security-aware parser for the HTTP protocol
CVE-2019-17420 MEDIUM 5.3 UPGRADE DOWNGRADE In OISF LibHTP before 0.5.31, as used in Suricata 4.1.4 and other products, an HTTP protocol parsing error cau
CVE-2018-10243 CRITICAL 9.8 DOWNGRADE htp_parse_authorization_digest in htp_parsers.c in LibHTP 0.5.26 allows remote attackers to cause a heap-based

References

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