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.
Published 2021-11-03 20:15:08
Updated 2023-01-20 02:04:18
Source HackerOne
View at NVD,   CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2021-22960

Probability of exploitation activity in the next 30 days: 0.26%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 64 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2021-22960

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source
5.8
MEDIUM AV:N/AC:M/Au:N/C:P/I:P/A:N
8.6
4.9
NIST
6.5
MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
3.9
2.5
NIST

CWE ids for CVE-2021-22960

  • The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.
    Assigned by:
    • nvd@nist.gov (Primary)
    • support@hackerone.com (Secondary)

References for CVE-2021-22960

Products affected by CVE-2021-22960

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