{"cve":"CVE-2021-38189","nvd":{"published":"2021-08-08T06:15:08.893","modified":"2026-06-17T04:01:43.500","status":"Modified","description":"An issue was discovered in the lettre crate before 0.9.6 for Rust. In an e-mail message body, an attacker can place a . character after two <CR><LF> sequences and then inject arbitrary SMTP commands.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-77"],"references":["https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/lettre/RUSTSEC-2021-0069.md","https://rustsec.org/advisories/RUSTSEC-2021-0069.html","https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/lettre/RUSTSEC-2021-0069.md","https://rustsec.org/advisories/RUSTSEC-2021-0069.html"],"products":["lettre:lettre"],"source":"nvd","synced_at":"2026-10-19T21:21:13.713336758+00:00"},"epss":{"cve":"CVE-2021-38189","score":0.01494,"percentile":0.74159,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-qc36-q22q-cjw3","url":"https://osv.dev/vulnerability/GHSA-qc36-q22q-cjw3","summary":"SMTP command injection in lettre","modified":"2023-11-08T04:06:25.799670Z","packages":[{"ecosystem":"crates.io","name":"lettre","purl":"pkg:cargo/lettre","ranges":[">=0.7.0 <0.9.6"],"fixed":["0.9.6"]}]},{"id":"RUSTSEC-2021-0069","url":"https://osv.dev/vulnerability/RUSTSEC-2021-0069","summary":"SMTP command injection in body","modified":"2023-11-08T04:06:25.799670Z","packages":[{"ecosystem":"crates.io","name":"lettre","purl":"pkg:cargo/lettre","ranges":[">=0.7.0 <0.9.6",">=0.10.0-alpha.1 <0.10.0-rc.3"],"fixed":["0.9.6","0.10.0-rc.3"]}]}],"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."]}