Vulnerability Report

CVE-2024-21647

Title: Puma

Other

Proof Of Concept

No public PoC currently indexed for CVE-2024-21647.

CWE Category CWE-444
Published Date Jan 08, 2024
Modified Date Nov 03, 2025
Exploit Status Not Found
Score 5.9 CVSS v3.1
Exploit Probability (EPSS)
2.46%

Vulnerability Summary

CVE-2024-21647: 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.

Impacted Vendors

P
psywerks 1
P
puma 1

Reference Links

https://github.com/puma/puma/commit/5fc43d73b6ff193325e657a24ed76dec79133e93 https://github.com/puma/puma/security/advisories/GHSA-c2f4-cvqm-65w2 https://github.com/puma/puma/commit/5fc43d73b6ff193325e657a24ed76dec79133e93 https://github.com/puma/puma/security/advisories/GHSA-c2f4-cvqm-65w2 https://lists.debian.org/debian-lts-announce/2024/11/msg00004.html
CVSS v3.1
Source Entity [email protected]
Severity MEDIUM
5.9
Attack Vector
NETWORK
Complexity
HIGH
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v3.1
Source Entity [email protected]
Severity HIGH
7.5
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2024-21647 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

MODIFIED

Vulnerability data or affected products updated.

PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity HIGH
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Stack

No specific products linked.