Is CVE-2016-1961 in the CISA KEV catalog?

No. CVE-2016-1961 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-1961?

CVE-2016-1961 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2016-1961?

CVE-2016-1961 has an EPSS score of 2.90% (85th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-1961?

Upgrade firefox on debian unstable to 45.0-1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2016-1961

HIGHEPSS 85th pctl

8.8

CVSS v3

NVD

Description

Use-after-free vulnerability in the nsHTMLDocument::SetBody function in dom/html/nsHTMLDocument.cpp in Mozilla Firefox before 45.0 and Firefox ESR 38.x before 38.7 allows remote attackers to execute arbitrary code by leveraging mishandling of a root element, aka ZDI-CAN-3574.

How to fix

Remediation Available

firefoxDebian

Fixed in:45.0-1CVE-2016-1961

firefoxUbuntu

Fixed in:45.0+build2-0ubuntu0.14.04.1USN-2917-1

thunderbirdUbuntu

Fixed in:1:38.7.2+build1-0ubuntu0.14.04.1USN-2934-1

Fixed in:1:38.7.2+build1-0ubuntu0.16.04.1USN-2934-1

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 InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

2.90%probability of exploitation in 30 days

85thpercentile

Elevated risk: more likely to be exploited than 85% of all known CVEs.

References

Vendor Advisory1

mozilla.org

Third-Party Advisory5

Issue Tracking1

bugzilla.mozilla.org

Other references17

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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.