Back
CVE-2018-12384
When handling a SSLv2-compatible ClientHello request, the server doesn't generate a new random value but sends an all-zero value instead.…
Medium5.9EPSS 1.5%
- Published
- Updated
- Reserved
- Assigned by
- mozilla
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.0 | Medium5.9 | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
- EPSS (exploitation in 30 days)
- 1.5% · top 26% of all CVEs (5 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.9.
Weakness
- Use of Insufficiently Random Values
- CWE-335 (opens in a new tab)All about CWE-335 and its CVEs
Affected products
NSS · Network Security Services (NSS)
- affected All versions prior to NSS 3.39
References (2)
- https://bugzilla.mozilla.org/show_bug.cgi?id=CVE-2018-12384 (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2018-12384)Record last updated .