CVE-2021-22959
MEDIUMCVSS 6.5/10EPSS 2.94%
Last modified
CVE-2021-22959 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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.. EPSS estimates a 2.94% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Llhttp | Llhttp | < 2.1.4 |
| Llhttp | Llhttp | >= 3.0.0, < 6.0.6 |
| Oracle | Graalvm | 20.3.4 |
| Oracle | Graalvm | 21.3.0 |
| Debian | Debian Linux | 11.0 |
References
- https://hackerone.com/reports/1238709Exploit, Issue Tracking, Third Party Advisory
- https://www.debian.org/security/2022/dsa-5170Mailing List, Third Party Advisory
- https://www.oracle.com/security-alerts/cpujan2022.htmlPatch, Third Party Advisory
- https://hackerone.com/reports/1238709Exploit, Issue Tracking, Third Party Advisory
- https://www.debian.org/security/2022/dsa-5170Mailing List, Third Party Advisory
- https://www.oracle.com/security-alerts/cpujan2022.htmlPatch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-22959?
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.
How severe is CVE-2021-22959?
CVE-2021-22959 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 2.94% probability of exploitation in the next 30 days.
How do I fix CVE-2021-22959?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-22959?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST