Is CVE-2016-1978 in the CISA KEV catalog?

No. CVE-2016-1978 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-1978?

CVE-2016-1978 has a CVSS v3 base score of 7.3 (HIGH).

What is the EPSS score for CVE-2016-1978?

CVE-2016-1978 has an EPSS score of 2.39% (82th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-1978?

Upgrade nss on debian 11 to 2:3.21-1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2016-1978

HIGHEPSS 82th pctl

7.3

CVSS v3

NVD

Description

Use-after-free vulnerability in the ssl3_HandleECDHServerKeyExchange function in Mozilla Network Security Services (NSS) before 3.21, as used in Mozilla Firefox before 44.0, allows remote attackers to cause a denial of service or possibly have unspecified other impact by making an SSL (1) DHE or (2) ECDHE handshake at a time of high memory consumption.

How to fix

Remediation Available

nssDebian

Fixed in:2:3.21-1CVE-2016-1978

thunderbirdUbuntu

Fixed in:1:38.8.0+build1-0ubuntu0.14.04.1USN-2973-1

Fixed in:1:38.8.0+build1-0ubuntu0.16.04.1USN-2973-1

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 ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityLow

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

Exploit Intelligence

2.39%probability of exploitation in 30 days

82ndpercentile

Elevated risk: more likely to be exploited than 82% of all known CVEs.

References

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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 2026-05-06.