CVE-2019-17023

MEDIUM

Description

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

https://bugzilla.mozilla.org/show_bug.cgi?id=1590001

https://usn.ubuntu.com/4234-1/

https://usn.ubuntu.com/4397-1/

https://www.debian.org/security/2020/dsa-4726

https://www.mozilla.org/security/advisories/mfsa2020-01/

Details

Source: MITRE

Published: 2020-01-08

Updated: 2020-07-18

Type: CWE-287

Risk Information

CVSS v2.0

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

CVSS v3.0

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