PRNG Seed Error Affecting nss package, versions <2:3.39-1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-ECHOLATEST-NSS-18169851
- published22 Jul 2026
- disclosed29 Apr 2019
Introduced: 29 Apr 2019
CVE-2018-12384 (opens in a new tab)How to fix?
Upgrade Echo:latest nss to version 2:3.39-1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream nss package and not the nss package as distributed by Echo.
See How to fix? for Echo:latest relevant fixed versions and status.
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.