Is CVE-2019-11707 in the CISA KEV catalog?

Yes. CVE-2019-11707 is on the CISA Known Exploited Vulnerabilities list, added 2022-05-23.

What is the CVSS severity of CVE-2019-11707?

CVE-2019-11707 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2019-11707?

CVE-2019-11707 has an EPSS score of 37.95% (98th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2019-11707?

Upgrade firefox on debian unstable to 67.0.3-1 or later. Fixes are available for 6 affected products.

CVE & CISA-KEV Catalog

CVE-2019-11707

HIGHCISA KEVEPSS 98th pctl

8.8

CVSS v3

NVD

Description

A type confusion vulnerability can occur when manipulating JavaScript objects due to issues in Array.pop. This can allow for an exploitable crash. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Firefox ESR < 60.7.1, Firefox < 67.0.3, and Thunderbird < 60.7.2.

CWE-843Type Confusion

How to fix

Remediation Available

firefoxDebian

Fixed in:67.0.3-1CVE-2019-11707

firefoxUbuntu

Fixed in:67.0.3+build1-0ubuntu0.16.04.1USN-4020-1

Fixed in:67.0.3+build1-0ubuntu0.18.04.1USN-4020-1

thunderbirdUbuntu

Fixed in:1:60.7.2+build2-0ubuntu0.16.04.1USN-4045-1

Fixed in:1:60.7.2+build2-0ubuntu0.18.04.1USN-4045-1

DeveloperEditionWindows application

Affected:67.0.3Fixed in:67.0.3Mozilla

Affected:60.7.1Fixed in:60.7.1Mozilla

Mozilla Firefox (en-US)Windows application

Affected:67.0.3Fixed in:67.0.3Mozilla

Affected:60.7.1Fixed in:60.7.1Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:60.7.2Fixed in:60.7.2Mozilla

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 ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploit Intelligence

37.95%probability of exploitation in 30 days

98thpercentile

Very high risk: more likely to be exploited than 98% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Mozilla Firefox and Thunderbird Type Confusion Vulnerability

Mozilla Firefox and Thunderbird contain a type confusion vulnerability that can occur when manipulating JavaScript objects due to issues in Array.pop, allowing for an exploitable crash.

Apply updates per vendor instructions.

Remediation due: 2022-06-13

References

Vendor Advisory3

Third-Party Advisory1

security.gentoo.org

Government Resource1

cisa.gov

Related Vulnerabilities

Other CWE-843 (Type Confusion) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2011-0611	High	8.8	99%	KEV	Fix
CVE-2012-0507	Critical	9.8	98%	KEV + Ransom	-
CVE-2017-8291	High	7.8	97%	KEV	Fix
CVE-2019-0752	High	7.5	82%	KEV + Ransom	-
CVE-2017-0037	High	8.1	80%	KEV	-
CVE-2016-7201	High	8.8	80%	KEV	-

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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 2025-10-27.