CVE-2024-21647

HIGH EPSS 57.0%
Published Jan 8, 20242y ago · Modified Jun 17, 20262w ago
7.5 CVSS 3.1
High
Find Similar
Published Jan 8, 2024 2y ago
Last Modified Jun 17, 2026 2w ago

Description

Puma is a web server for Ruby/Rack applications built for parallelism. Prior to version 6.4.2, puma exhibited incorrect behavior when parsing chunked transfer encoding bodies in a way that allowed HTTP request smuggling. Fixed versions limits the size of chunk extensions. Without this limit, an attacker could cause unbounded resource (CPU, network bandwidth) consumption. This vulnerability has been fixed in versions 6.4.2 and 5.6.8.

CVSS Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
57.0% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-444

Affected Products 2

VendorProductVersionRange
pumapuma* <5.6.8
pumapuma*≥6.0.0  –  <6.4.2

References 3

  • github.com https://github.com/puma/puma/commit/5fc43d73b6ff193325e657a24ed76dec79133e93
    Patch
  • github.com https://github.com/puma/puma/security/advisories/GHSA-c2f4-cvqm-65w2
    Vendor Advisory
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2024/11/msg00004.html

Remediation

  • github.com https://github.com/puma/puma/commit/5fc43d73b6ff193325e657a24ed76dec79133e93
    Patch