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CVE-2019-11707

HIGH
8.8
CVSS Score
Published: July 23, 2019 at 01:20 PM UTC
Updated: June 17, 2026 at 02:13 AM UTC
3 products affected across 1 vendorFirefoxThunderbirdFirefox ESR

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Severity
HIGH8.8
Exploitation
CISA KEV
Exploit prediction
EPSS 38%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score38.0%

EPSS (Exploit Prediction Scoring System) estimates a 38.0% chance this CVE is exploited in the wild within the next 30 days — higher than 99% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

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.

Required Action
Apply updates per vendor instructions.
Ransomware Use
Unknown
Added to KEV
May 23, 2022
Remediation Due
Jun 13, 2022
1599 days overdue
Notes
https://nvd.nist.gov/vuln/detail/CVE-2019-11707

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Firefox· Mozilla
95%
v < 60.7.1v < 67.0.3
Affected range stops below 60.7.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 60.7.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 67.0.3, so it looks safe — our inference, not a vendor statement
Thunderbird· Mozilla
95%
v < 60.7.2
Affected range stops below 60.7.2, so it looks safe — our inference, not a vendor statement
Firefox ESR· Mozilla
60%
v < 60.7.1
Affected range stops below 60.7.1, so it looks safe — our inference, not a vendor statement

References (5)

x_refsource_MISCIssue TrackingPermissions RequiredVendor Advisory
Source: [email protected]
https://bugzilla.mozilla.org/show_bug.cgi?id=1544386
Vendor Advisoryx_refsource_GENTOOThird Party Advisory
Source: [email protected]
https://security.gentoo.org/glsa/201908-12
x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2019-18/
x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2019-20/
US Government Resource
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-11707

SSVC — Action Prioritization

SSVCActiveNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-843

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