CVE-2021-44040
HIGHCVSS 7.5/10EPSS 1.91%
Last modified
CVE-2021-44040 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Improper Input Validation vulnerability in request line parsing of Apache Traffic Server allows an attacker to send invalid requests. This issue affects Apache Traffic Server 8.0.0 to 8.1.3 and 9.0.0 to 9.1.1.. EPSS estimates a 1.91% chance of exploitation in the next 30 days.
Description
Improper Input Validation vulnerability in request line parsing of Apache Traffic Server allows an attacker to send invalid requests. This issue affects Apache Traffic Server 8.0.0 to 8.1.3 and 9.0.0 to 9.1.1.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Apache | Traffic Server | >= 8.0.0, <= 8.1.3 |
| Apache | Traffic Server | >= 9.0.0, <= 9.1.1 |
| Debian | Debian Linux | 10.0 |
| Debian | Debian Linux | 11.0 |
References
- https://lists.apache.org/thread/zblwzcfs9ryhwjr89wz4osw55pxm6dx6Mailing List, Vendor Advisory
- https://www.debian.org/security/2022/dsa-5153Third Party Advisory
- https://lists.apache.org/thread/zblwzcfs9ryhwjr89wz4osw55pxm6dx6Mailing List, Vendor Advisory
- https://www.debian.org/security/2022/dsa-5153Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-44040?
Improper Input Validation vulnerability in request line parsing of Apache Traffic Server allows an attacker to send invalid requests. This issue affects Apache Traffic Server 8.0.0 to 8.1.3 and 9.0.0 to 9.1.1.
How severe is CVE-2021-44040?
CVE-2021-44040 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.91% probability of exploitation in the next 30 days.
How do I fix CVE-2021-44040?
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-2021-44040?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST