Versions mentioned in the description apply to the upstream
Remediation section below for
Debian:10 relevant versions.
A vulnerability exists where it possible to force Network Security Services (NSS) to sign CertificateVerify with PKCS#1 v1.5 signatures when those are the only ones advertised by server in CertificateRequest in TLS 1.3. PKCS#1 v1.5 signatures should not be used for TLS 1.3 messages. This vulnerability affects Firefox < 68.
nss to version 2:3.42.1-1+deb10u1 or higher.