Related Vulnerabilities: CVE-2019-17023  

A security issue has been found in the NSS component of Firefox before 72.0. 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.

Severity Low

Remote Yes

Type Denial of service

Description

A security issue has been found in the NSS component of Firefox before 72.0. 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.

AVG-1084 firefox 71.0-1 72.0-1 Critical Fixed

https://www.mozilla.org/en-US/security/advisories/mfsa2020-01/#CVE-2019-17023
https://bugzilla.mozilla.org/show_bug.cgi?id=1590001