{"cve":"CVE-2019-12855","nvd":{"published":"2019-06-16T12:29:00.227","modified":"2026-06-17T02:15:37.527","status":"Modified","description":"In words.protocols.jabber.xmlstream in Twisted through 19.2.1, XMPP support did not verify certificates when used with TLS, allowing an attacker to MITM connections.","cvss_v4":null,"cvss_v3":{"version":"3.0","vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","score":7.4},"cwes":["CWE-295"],"references":["http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00013.html","http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00028.html","https://github.com/twisted/twisted/pull/1147","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PLTZDMFBNFSJMBXYJNGJHENJA4H2TSMZ/","https://twistedmatrix.com/trac/ticket/9561"],"products":["twisted:twisted"],"source":"nvd","synced_at":"2026-10-19T20:57:00.690689396+00:00"},"epss":{"cve":"CVE-2019-12855","score":0.01809,"percentile":0.78607,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-65rm-h285-5cc5","url":"https://osv.dev/vulnerability/GHSA-65rm-h285-5cc5","summary":"Improper Certificate Validation in Twisted","modified":"2024-12-06T05:26:31.559414Z","packages":[{"ecosystem":"PyPI","name":"twisted","purl":"pkg:pypi/twisted","ranges":["<19.7.0rc1"],"fixed":["19.7.0rc1"]}]},{"id":"PYSEC-2019-129","url":"https://osv.dev/vulnerability/PYSEC-2019-129","summary":"","modified":"2023-11-08T04:01:06.614992Z","packages":[{"ecosystem":"PyPI","name":"twisted","purl":"pkg:pypi/twisted","ranges":["<19.7.0rc1"],"fixed":["19.7.0rc1"]}]}],"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."]}