Vulnerability in Mozilla Firefox
CVE-2019-11727
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.
Vulnerability class: Improper Certificate Validation
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.018 (77.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 77.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.017 · newest: 0.018 · change: +0.001
Affected products
- Mozilla Firefox — versions unspecified
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.mozilla.org/security/advisories/mfsa2019-21/ (Vendor Advisory)
- bugzilla.mozilla.org/show_bug.cgi (Permissions Required, Issue Tracking, Vendor Advisory)
- access.redhat.com/errata/RHSA-2019:1951 (vendor-advisory)
- security.gentoo.org/glsa/201908-12 (vendor-advisory)
- lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.html (vendor-advisory)
- lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.html (vendor-advisory)
- lists.opensuse.org/opensuse-security-announce/2019-10/msg00011.html (vendor-advisory)
- lists.opensuse.org/opensuse-security-announce/2019-10/msg00017.html (vendor-advisory)
- lists.opensuse.org/opensuse-security-announce/2020-01/msg00006.html (vendor-advisory)
Frequently asked questions
- What is CVE-2019-11727?
- CVE-2019-11727 is a medium-severity vulnerability in Mozilla Firefox, classified under Improper Certificate Validation. CVSS score: 5.3/10. Published 2019-07-23.
- How severe is CVE-2019-11727?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2019-11727 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.