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.
https://bugzilla.mozilla.org/show_bug.cgi?id=1590001
https://www.mozilla.org/security/advisories/mfsa2020-01/
https://usn.ubuntu.com/4234-1/
Source: MITRE
Published: 2020-01-08
Updated: 2023-01-27
Type: CWE-287
Base Score: 4.3
Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N
Impact Score: 2.9
Exploitability Score: 8.6
Severity: MEDIUM
Base Score: 6.5
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Impact Score: 3.6
Exploitability Score: 2.8
Severity: MEDIUM