CVE-2019-11703

A flaw in Thunderbird's implementation of iCal causes a heap buffer overflow in parser_get_next_char when processing certain email messages, resulting in a…

published July 23, 2019

CVSS
—
EPSS
11%
Percentile
95.8
In the wild
Unconfirmed
What it is

⚠️ A heap buffer overflow is lurking in Thunderbird's iCal implementation! This little bug can pop up when processing certain email messages, and it affects versions below 60.7.1. 🔥 Think of this vulnerability as a crowded restaurant trying to serve too many diners at once; the kitchen can overflow with orders and potentially cause chaos. If things go awry, the servers might even trip over each other and crash! If exploited, this could lead to Thunderbird crashing unexpectedly, which means you might lose access to your emails temporarily. While no exploits are known yet, it's best to tackle this one before it becomes a problem.

Put simply

Think of this vulnerability as a crowded restaurant trying to serve too many diners at once; the kitchen can overflow with orders and potentially cause chaos. If things go awry, the servers might even trip over each other and crash! In Thunderbird, a flaw in the iCal parser can trigger a heap buffer overflow in the function parser_get_next_char when processing specially crafted email messages. This could lead to a denial of service via application crashes.

What to do

If exploited, this could lead to Thunderbird crashing unexpectedly, which means you might lose access to your emails temporarily. While no exploits are known yet, it's best to tackle this one before it becomes a problem. To stay safe, immediately upgrade Thunderbird to version 60.7.1 or later. Regularly check for updates to ensure your software is protected against such vulnerabilities. You’ve got this! Keep your software updated and stay ahead of potential threats. 🛡️

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.10527 · 95.8th percentile
Published
2019-07-23T13:20Z
EPSS history
Timeline
  • 23 JUL 13:20Z
    A flaw in Thunderbird's implementation of iCal causes a heap buffer overflow in parser_get_next_char when processing certain email messages, resulting in a…
    cvelistv5