CVE-2019-11707 | BDVDB-2026-119653 Detail

MozillaFirefox ESR

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.

Impact#

Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact high. Attack vector: network.

Weaknesses#

CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')

References#

Exploit#

No public exploit known

History#

Version 12019-07-23Record published in the CVE List.
Version 22025-10-21Most recent update recorded in the CVE List.

Published

Published: 2019-07-23
Last modified: 2025-10-21

Vendor information

Vendor: Mozilla
Product: Firefox ESR

All Mozilla vulnerabilities

Score

8.8 High

EPSS

37.9%, Moderate

Estimated chance of exploitation in the next 30 days. EPSS percentile: 98.6.

KEV

Yes

Listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Type Confusion

Action

Apply updates per vendor instructions.

Affected Systems

Vulnerable
< 60.7.1
Fixed
60.7.1

Scoring System

CVSS v4.0

Not available

CVSS v3.1

8.8 High

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

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Privileges Required	None
User Interaction	Required
Scope	Unchanged
Confidentiality	High
Integrity	High
Availability	High

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).