CVE-2019-11707
Mozilla Firefox and Thunderbird Type Confusion Vulnerability
What is affected
| Vendor | Mozilla |
|---|---|
| Product | Firefox and Thunderbird |
| Weakness | CWE-843 |
The 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.
Required action
Apply updates per vendor instructions.
US federal civilian agencies were required to act by 13 June 2022 under BOD 22-01. The deadline is a compliance date, not a measure of severity — it says nothing about how dangerous the flaw is to anyone else.
Where this comes from
Every field on this page is taken from the CISA Known Exploited Vulnerabilities catalog, last synced 12 Nov 2026, 00:29. Nothing here is our own assessment. For the technical scoring, see the NVD record below.
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