{"cve":"CVE-2021-37147","nvd":{"published":"2021-11-03T16:15:07.987","modified":"2026-06-17T04:00:08.457","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","score":7.5},"cwes":["CWE-20","CWE-444"],"references":["https://lists.apache.org/thread/k01797hyncx53659wr3o72s5cvkc3164","https://www.debian.org/security/2022/dsa-5153","https://lists.apache.org/thread/k01797hyncx53659wr3o72s5cvkc3164","https://www.debian.org/security/2022/dsa-5153"],"products":["apache:traffic_server","debian:debian_linux"],"source":"nvd","synced_at":"2026-10-19T21:24:39.218183596+00:00"},"epss":{"cve":"CVE-2021-37147","score":0.02519,"percentile":0.84843,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}