CVE-2021-37149 json
Request Smuggling - multiple attacks
published 2021-11-03 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-23723
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.7%
- EPSS 2.7% chance of exploitation in 30 days, percentile 86%
- public exploits
- 0
- none known
Summary
Improper Input Validation vulnerability in header parsing of Apache Traffic Server allows an attacker to smuggle requests. This issue affects Apache Traffic Server 8.0.0 to 8.1.2 and 9.0.0 to 9.1.0.
Patch / fix
- trafficserver Debian 12 9.1.1+ds-1
debian advisories DEBIAN-CVE-2021-37149
Exploit prediction
2.70% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:P/A:N |
Affected products
- Apache Software Foundation Apache Traffic Server
Classification
- Weakness
-
- CWE-20 Improper Input Validation
References
-
lists.apache.org
/thread/k01797hyncx53659wr3o72s5cvkc3164
mailing-list, patch, vendor-advisory
-
debian.org
/security/2022/dsa-5153
vendor-advisory, third-party-advisory
Sources
- CVE List CVE-2021-37149
- NVD CVE-2021-37149
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.