CVE-2021-22959
MEDIUM
6.5
CVSS Score
Published: November 15, 2021 at 02:45 PM UTC
Updated: June 17, 2026 at 03:38 AM UTC
4 products affected across 4 vendorsDebian LinuxGraalVMLlhttp
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Severity
MEDIUM6.5
Exploit prediction
EPSS 3%
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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Debian Linux· Debiandrupal
95%v < 2.1.43.0.0 ≤ v < 6.0.6
Affected range stops below 2.1.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.0.6, so it looks safe — our inference, not a vendor statement
10.0 ≤ v < 10.*11.0 ≤ v < 11.*12.0 ≤ v < 12.22.713.0 ≤ v < 13.*14.0 ≤ v < 14.18.115.0 ≤ v < 15.*16.0 ≤ v < 16.11.14.0 ≤ v < 4.*5.0 ≤ v < 5.*6.0 ≤ v < 6.*7.0 ≤ v < 7.*8.0 ≤ v < 8.*9.0 ≤ v < 9.*10.011.012.013.014.015.016.04.05.06.07.08.09.0
Affected range stops below 10.*, so it looks safe — our inference, not a vendor statement
Affected range stops below 11.*, so it looks safe — our inference, not a vendor statement
Affected range stops below 12.22.7, so it looks safe — our inference, not a vendor statement
Affected range stops below 13.*, so it looks safe — our inference, not a vendor statement
Affected range stops below 14.18.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 15.*, so it looks safe — our inference, not a vendor statement
Affected range stops below 16.11.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.*, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.*, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.*, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.*, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.*, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.*, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (3)
x_refsource_MISCExploitIssue TrackingThird Party Advisory
Source: [email protected]
https://hackerone.com/reports/1238709Vendor Advisoryx_refsource_DEBIANMailing ListThird Party Advisory
Source: [email protected]
https://www.debian.org/security/2022/dsa-5170x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://www.oracle.com/security-alerts/cpujan2022.htmlCVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- LOW
- Integrity
- LOW
- Availability
- NONE
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-444
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