CVE-2018-12384

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.

Category

5.9
CVSS
Severity: Medium
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.70% Top 30%
Vendor Advisory mozilla.org
Affected: NSS Network Security Services (NSS)
Published at:
Updated at:

References

Link Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=CVE-2018-12384 vendor advisory issue tracking
https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html

Frequently Asked Questions

What is the severity of CVE-2018-12384?
CVE-2018-12384 has been scored as a medium severity vulnerability.
How to fix CVE-2018-12384?
To fix CVE-2018-12384, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2018-12384 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2018-12384 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2018-12384?
CVE-2018-12384 affects NSS Network Security Services (NSS).
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.