CVE-2021-22959

Advisory lineage Upstream: 0 Downstream: 26
Modified
Published: 15 Nov 2021, 14:45
Last modified:30 Apr 2025, 22:24

Vulnerability Summary

Overall Risk (default)
medium
36/100
CVSS Score
6.5 MEDIUM
v3.1 (nvd)
EPSS Score
0.16% LOW
0% probability -0.05%
KEV
Not listed
Ransomware
No reports
Public exploits
1 found
Dark Web
Not detected

Timeline

15 Nov 2021, 14:45
Published
Vulnerability first disclosed
30 Apr 2025, 22:24
Last Modified
Vulnerability information updated

Description

The parser in accepts requests with a space (SP) right after the header name before the colon. This can lead to HTTP Request Smuggling (HRS) in llhttp < v2.1.4 and < v6.0.6.

CVSS Metrics

  • v3.1•MEDIUM•Score: 6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
  • v2.0•MEDIUM•Score: 6.4AV:N/AC:L/Au:N/C:P/I:P/A:N

EPSS Trends

Current EPSS score: 0.16%• Percentile: 37%

Techniques & Countermeasures

  • CWE-444•Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

    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.

Affected Systems

  • debian•debian_linux

    11.0

  • llhttp•llhttp

    < 2.1.4 | ≥ 3.0.0, < 6.0.6

  • nodejs•node

    ≥ 4.0, < 4.* | ≥ 5.0, < 5.* | ≥ 6.0, < 6.* | ≥ 7.0, < 7.* | ≥ 8.0, < 8.* | ≥ 9.0, < 9.* | ≥ 10.0, < 10.* | ≥ 11.0, < 11.* | ≥ 12.0, < 12.22.7 | ≥ 13.0, < 13.* | ≥ 14.0, < 14.18.1 | ≥ 15.0, < 15.* | ≥ 16.0, < 16.11.1

  • oracle•graalvm

    20.3.4 | 21.3.0

References (3)