CVE-2019-17023
MEDIUMFirefox < 72.0 - Denial of Service via TLS State Machine Mismanagement
Title source: llmDescription
After a HelloRetryRequest has been sent, the client may negotiate a lower protocol that TLS 1.3, resulting in an invalid state transition in the TLS State Machine. If the client gets into this state, incoming Application Data records will be ignored. This vulnerability affects Firefox < 72.
References (5)
Core 5
Core References
Issue Tracking, Permissions Required x_refsource_misc
https://bugzilla.mozilla.org/show_bug.cgi?id=1590001
Vendor Advisory x_refsource_confirm
https://www.mozilla.org/security/advisories/mfsa2020-01/
Third Party Advisory vendor-advisory
x_refsource_ubuntu
https://usn.ubuntu.com/4234-1/
Third Party Advisory vendor-advisory
x_refsource_ubuntu
https://usn.ubuntu.com/4397-1/
Third Party Advisory vendor-advisory
x_refsource_debian
https://www.debian.org/security/2020/dsa-4726
Scores
CVSS v3
6.5
EPSS
0.0090
EPSS Percentile
75.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Details
CWE
CWE-287
Status
published
Products (7)
canonical/ubuntu_linux
16.04
canonical/ubuntu_linux
18.04
canonical/ubuntu_linux
19.04
canonical/ubuntu_linux
19.10
canonical/ubuntu_linux
20.04
debian/debian_linux
10.0
mozilla/firefox
< 72.0
Published
Jan 08, 2020
Tracked Since
Feb 18, 2026