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Vulnerability record · CVE-2018-12384 · published 29 April 2019

CVE-2018-12384: Mozilla network security services vulnerability

Mozilla · Network Security Services

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.

5.9 CVSS 3.0 Medium EPSS 1.5% · top 27.0% CWE-335 · CWE-335
5.9CVSS 3.0 base score, v2 4.3
1.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2018-12384), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.