CVE-2019-11707KEV · OVERDUE

Mozilla Firefox and Thunderbird Type Confusion Vulnerability

High · published July 23, 2019

Patch now

Confirmed exploited, and the score agrees

CVSS calls it high at 8.8. It is confirmed in active exploitation. It sits in the 98.5th percentile for exploit probability.

1593
days past CISA
deadline
CVSS v3.1
8.8
EPSS
38%
Percentile
98.5
In the wild
Confirmed
What it is

🚨 Say hello to chaos in JavaScript! A type confusion vulnerability lurking in Array.pop can lead to crashes, and we know attackers are already taking advantage! ⚡ Think of it like a restaurant where the chef accidentally swaps the ingredients — the wrong dish could be served, causing a culinary disaster! This flaw lets attackers manipulate objects, leading to unexpected crashes. If exploited, this bug could lead not just to crashes but also to potential data corruption, leaving users with a frustrating experience and possibly exposing sensitive information. Imagine your browser suddenly freezing while you’re in the middle of something important, all thanks to a sneaky attack!

Put simply

Think of it like a restaurant where the chef accidentally swaps the ingredients — the wrong dish could be served, causing a culinary disaster! This flaw lets attackers manipulate objects, leading to unexpected crashes. This type confusion vulnerability occurs when JavaScript mishandles object manipulation due to improper checks in the Array.pop method, allowing attackers to craft scenarios that lead to an exploitable crash.

What to do

If exploited, this bug could lead not just to crashes but also to potential data corruption, leaving users with a frustrating experience and possibly exposing sensitive information. Imagine your browser suddenly freezing while you’re in the middle of something important, all thanks to a sneaky attack! To protect yourself, immediately update affected versions: Firefox ESR to 60.7.1 or higher, Firefox to 67.0.3 or higher, and Thunderbird to 60.7.2 or higher. Always ensure your software is up to date! 🛡️ You've got this! Follow these steps, and you'll keep your browsing smooth and secure! 🔥

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.37696 · 98.5th percentile
Published
2019-07-23T13:20Z
KEV added
2022-05-23 · due 2022-06-13
EPSS history
Timeline
  • 23 MAY 00:00Z
    Added to CISA KEV — remediate by Jun 13
    kev
  • 23 JUL 13:20Z
    A type confusion vulnerability can occur when manipulating JavaScript objects due to issues in Array.pop
    cvelistv5