CVE-2019-17023

nss: TLS 1.3 HelloRetryRequest downgrade request sets client into invalid state

Published Jan 8, 2020 CVSS 3.1 · 6.5 Medium EPSS 1.3% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DSA Debian DSA DSA-4726-1 nss security update
EUVD EUVD EUVD-2019-7497 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.
Ubuntu USN Ubuntu USN USN-4234-1 Firefox vulnerabilities
Ubuntu USN Ubuntu USN USN-4397-1 NSS vulnerabilities
History

No history.

Weaknesses

Sources

Status
PUBLISHED
Assigner
mozilla
Published
Updated
Aug 5, 2024, 1:24 AM
Reserved
Sep 30, 2019, 12:00 AM
Status
Modified
Published
Jan 8, 2020, 10:15 PM
Modified
Jun 17, 2026, 2:23 AM
Severity
Low
Public date
Jan 8, 2020, 12:00 AM