{"cve":"CVE-2021-38371","nvd":{"published":"2021-08-10T15:15:08.310","modified":"2026-06-17T04:01:58.050","status":"Modified","description":"The STARTTLS feature in Exim through 4.94.2 allows response injection (buffering) during MTA SMTP sending.","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-74"],"references":["https://nostarttls.secvuln.info","https://www.exim.org","https://www.exim.org/static/doc/security/CVE-2021-38371.txt","https://lists.debian.org/debian-lts-announce/2024/10/msg00029.html","https://nostarttls.secvuln.info"],"products":["exim:exim"],"source":"nvd","synced_at":"2026-10-19T21:21:13.713336758+00:00"},"epss":{"cve":"CVE-2021-38371","score":0.01996,"percentile":0.80715,"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."]}