{"cve":"CVE-2019-11727","nvd":{"published":"2019-07-23T14:15:16.450","modified":"2026-06-17T02:13:30.853","status":"Modified","description":"A vulnerability exists where it possible to force Network Security Services (NSS) to sign CertificateVerify with PKCS#1 v1.5 signatures when those are the only ones advertised by server in CertificateRequest in TLS 1.3. PKCS#1 v1.5 signatures should not be used for TLS 1.3 messages. This vulnerability affects Firefox < 68.","cvss_v4":null,"cvss_v3":{"version":"3.0","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":5.3},"cwes":["CWE-295"],"references":["http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.html","http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.html","http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00011.html","http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00017.html","http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00006.html"],"products":["mozilla:firefox"],"source":"nvd","synced_at":"2026-10-19T20:58:11.797917892+00:00"},"epss":{"cve":"CVE-2019-11727","score":0.01812,"percentile":0.78641,"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."]}