CVE-2019-9795

A vulnerability where type-confusion in the IonMonkey just-in-time (JIT) compiler could potentially be used by malicious JavaScript to trigger a potentially…

published April 26, 2019

CVSS
—
EPSS
2%
Percentile
77.0
In the wild
Unconfirmed
What it is

⚠️ A crafty mix-up in the IonMonkey JIT compiler could let malicious JavaScript cause unexpected crashes! Think of it like a chef mixing up the ingredients in a recipe — using salt instead of sugar. The dish might end up inedible, but it could also just ruin dinner for everyone at the table! If exploited, this vulnerability could lead to crashes in affected applications like Thunderbird and Firefox, causing frustrating interruptions for users. While it may not grant full control to an attacker, the potential for disruption is definitely present, so it shouldn’t be taken lightly.

Put simply

Think of it like a chef mixing up the ingredients in a recipe — using salt instead of sugar. The dish might end up inedible, but it could also just ruin dinner for everyone at the table! This type-confusion vulnerability in the IonMonkey JIT compiler allows malicious JavaScript to potentially trigger crashes, affecting versions of Thunderbird below 60.6, Firefox ESR below 60.6, and Firefox below 66.

What to do

If exploited, this vulnerability could lead to crashes in affected applications like Thunderbird and Firefox, causing frustrating interruptions for users. While it may not grant full control to an attacker, the potential for disruption is definitely present, so it shouldn’t be taken lightly. To mitigate this risk, users should upgrade to Thunderbird 60.6 and Firefox 66 or later versions as soon as possible. Always keep your software updated to avoid vulnerabilities! You've got this! Stay vigilant and keep your software up to date for a safer browsing experience! 🛡️

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.01699 · 77.0th percentile
Published
2019-04-26T16:13Z
EPSS history
Timeline
  • 26 APR 16:13Z
    A vulnerability where type-confusion in the IonMonkey just-in-time (JIT) compiler could potentially be used by malicious JavaScript to trigger a potentially…
    cvelistv5