{"cve":"CVE-2019-16791","nvd":{"published":"2020-01-22T02:15:11.367","modified":"2026-06-17T02:22:48.730","status":"Modified","description":"In postfix-mta-sts-resolver before 0.5.1, All users can receive incorrect response from daemon under rare conditions, rendering downgrade of effective STS policy.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","score":5.9},"cwes":["CWE-757"],"references":["https://gist.github.com/Snawoot/b9da85d6b26dea5460673b29df1adc6b","https://github.com/Snawoot/postfix-mta-sts-resolver/security/advisories/GHSA-h92m-42h4-82f6","https://gist.github.com/Snawoot/b9da85d6b26dea5460673b29df1adc6b","https://github.com/Snawoot/postfix-mta-sts-resolver/security/advisories/GHSA-h92m-42h4-82f6"],"products":["postfix-mta-sts-resolver_project:postfix-mta-sts-resolver"],"source":"nvd","synced_at":"2026-10-19T21:01:01.339895972+00:00"},"epss":{"cve":"CVE-2019-16791","score":0.00858,"percentile":0.58464,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-h92m-42h4-82f6","url":"https://osv.dev/vulnerability/GHSA-h92m-42h4-82f6","summary":"postfix-mta-sts-resolver Algorithm Downgrade vulnerability","modified":"2026-09-10T03:47:52.688559963Z","packages":[{"ecosystem":"PyPI","name":"postfix-mta-sts-resolver","purl":"pkg:pypi/postfix-mta-sts-resolver","ranges":["<0.5.1"],"fixed":["0.5.1"]}]},{"id":"PYSEC-2020-174","url":"https://osv.dev/vulnerability/PYSEC-2020-174","summary":"","modified":"2023-11-08T04:01:21.829017Z","packages":[{"ecosystem":"PyPI","name":"postfix-mta-sts-resolver","purl":"pkg:pypi/postfix-mta-sts-resolver","ranges":["<0.5.1"],"fixed":["0.5.1"]}]}],"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."]}