What is the CVSS score of CVE-2021-22960?

CVE-2021-22960 has a CVSS 3.1 base score of 6.5 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N. EPSS exploitation probability: 2.3%.

Is there a public PoC exploit available for CVE-2021-22960?

Yes, a public proof-of-concept exploit is available for CVE-2021-22960. Prioritise patching immediately. EPSS: 2.3%.

Is there a patch available for CVE-2021-22960?

Yes, a patch is available for CVE-2021-22960. Update the affected software to the latest version immediately.

Llhttp CVE-2021-22960

MEDIUM

HTTP Request/Response Smuggling (CWE-444)

2021-11-03 support@hackerone.com

Request Smuggling Information Disclosure Llhttp Graalvm Debian Linux

6.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

6.5 MEDIUM

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

CVE Published

Nov 03, 2021 - 20:15 nvd

MEDIUM 6.5

DescriptionNVD

The parse function in llhttp < 2.1.4 and < 6.0.6. ignores chunk extensions when parsing the body of chunked requests. This leads to HTTP Request Smuggling (HRS) under certain conditions.

AnalysisAI

The parse function in llhttp < 2.1.4 and < 6.0.6. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.

Technical ContextAI

This vulnerability is classified as HTTP Request/Response Smuggling (CWE-444), which allows attackers to manipulate HTTP request interpretation between frontend and backend servers. The parse function in llhttp < 2.1.4 and < 6.0.6. ignores chunk extensions when parsing the body of chunked requests. This leads to HTTP Request Smuggling (HRS) under certain conditions. Affected products include: Llhttp, Oracle Graalvm, Debian Debian Linux.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Enforce strict HTTP parsing, normalize requests at proxy layer, use HTTP/2 end-to-end, reject ambiguous headers.