CVE-2018-12384

MediumCVSS 5.9/10Last modified Jun 17, 2026

Description

When handling a SSLv2-compatible ClientHello request, the server doesn't generate a new random value but sends an all-zero value instead. This results in full malleability of the ClientHello for SSLv2 used for TLS 1.2 in all versions prior to NSS 3.39. This does not impact TLS 1.3.

Metrics

CVSS 3.0 5.9/10CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Weakness enumeration

CWE-335

Affected software

Vendor	Product	Versions
NSS	Network Security Services (NSS)	All versions prior to NSS 3.39

References

https://bugzilla.mozilla.org/show_bug.cgi?id=CVE-2018-12384Issue Tracking, Vendor Advisory
https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html
https://bugzilla.mozilla.org/show_bug.cgi?id=CVE-2018-12384Issue Tracking, Vendor Advisory
https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html

Timeline

Published: Apr 29, 2019
Last modified: Jun 17, 2026
NVD status: Modified

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