CVE-2024-28871 | Excessive CPU used on malformed traffic

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.

Published: 2024-04-04 Last update: 2025-06-30 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-28871 is rated Moderate Risk (49.2/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.84%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2024-28871

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.13% 0.84% +0.71%
2 2026-03-07 0.19% 0.13% -0.05%
3 2025-11-21 — 0.19% —

Full EPSS history (15 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-28871

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]

Weakness enumeration for CVE-2024-28871

OS Trackers for CVE-2024-28871

vendor priority summary link
debian unimportant CVE-2024-28871 unimportant priority: Debian including 1 source packages (libhtp), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2024-28871
suse high CVE-2024-28871 severity important: SUSE including 2 source package names (libhtp-devel-0.5.48-2.1, libhtp2-0.5.48-2.1), 2 product×package rows across 1 product lines (openSUSE Tumbleweed): Fixed 2. https://www.suse.com/security/cve/CVE-2024-28871/
ubuntu medium CVE-2024-28871 medium priority: Ubuntu including 1 source packages (libhtp), 10 status rows across 10 suites (bionic, focal, jammy, mantic, noble, oracular, plucky, questing, upstream, xenial): not-affected 4, released 4, ignored 2. https://ubuntu.com/security/CVE-2024-28871

Affected software / configurations for CVE-2024-28871

Vendor Product Version Raw CPE
oisf libhtp 0.5.46 cpe:2.3:a:oisf:libhtp:0.5.46:*:*:*:*:*:*:*

References for CVE-2024-28871

cvelogic Threat Intelligence