CVE-2018-12384

MEDIUMEPSS 72th pctl

5.9

CVSS v3

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.

CWE-335

How to fix

Remediation Available

nssDebian

Fixed in:2:3.39-1CVE-2018-12384

libnss3Ubuntu

Fixed in:2:3.28.4-0ubuntu0.14.04.4USN-3850-1

Fixed in:2:3.28.4-0ubuntu0.16.04.4USN-3850-1

Fixed in:2:3.35-2ubuntu2.1USN-3850-1

nssUbuntu

Fixed in:2:3.28.4-0ubuntu0.14.04.4USN-3850-1

Fixed in:2:3.28.4-0ubuntu0.16.04.4USN-3850-1

Fixed in:2:3.35-2ubuntu2.1USN-3850-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

1.50%probability of exploitation in 30 days

72ndpercentile

Elevated risk: more likely to be exploited than 72% of all known CVEs.

References

Vendor Advisory1

bugzilla.mozilla.org

Other references1

oracle.com

Related Vulnerabilities

Other CWE-335 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2018-14647	High	7.5	11%	-	Fix
CVE-2018-12520	High	8.1	11%	-	Fix
CVE-2016-10180	High	7.5	4.4%	-	-
CVE-2021-27211	High	7.5	3.3%	-	-
CVE-2021-41117	High	8.7	3.1%	-	Fix
CVE-2017-11519	Critical	9.8	3.1%	-	-

Common questions

How do I fix CVE-2018-12384?

Published advisories record a fix for 3 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2018-12384 being actively exploited?

Not that we know of. CVE-2018-12384 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 1.5% is the estimated probability that it will be exploited in the next 30 days. That is higher than 72% of all scored CVEs.

How severe is CVE-2018-12384?

CVE-2018-12384 has a CVSS v3 base score of 5.9, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2018-12384 affect?

Published advisories record a fix for nss (Debian), libnss3 (Ubuntu), nss (Ubuntu). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.