CVE-2012-3964

Use-after-free vulnerability in the gfxTextRun::GetUserData function in Mozilla Firefox before 15.0, Firefox ESR 10.x before 10.0.7, Thunderbird before 15.0…

published August 29, 2012

CVSS
—
EPSS
5%
Percentile
92.5
In the wild
Unconfirmed
What it is

⚠️ A crafty use-after-free flaw in Mozilla Firefox and Thunderbird could turn your trusted browser into a hostile playground for attackers! 🔥 Think of this vulnerability as a library where books are returned but not properly shelved. If someone sneaks in and grabs a book that's being processed, they could read whatever's inside, possibly rewriting the whole story! 📚 An attacker could exploit this vulnerability to execute arbitrary code, leading to full control over your system—or worse, outright crashes that halt your browsing and productivity. Imagine your favorite website crashing, while your data hangs in the balance!

Put simply

Think of this vulnerability as a library where books are returned but not properly shelved. If someone sneaks in and grabs a book that's being processed, they could read whatever's inside, possibly rewriting the whole story! 📚 This use-after-free vulnerability in the gfxTextRun::GetUserData function allows attackers to manipulate memory that has already been freed, potentially causing heap corruption, which can be exploited for code execution.

What to do

An attacker could exploit this vulnerability to execute arbitrary code, leading to full control over your system—or worse, outright crashes that halt your browsing and productivity. Imagine your favorite website crashing, while your data hangs in the balance! To safeguard your system, upgrade Firefox and Thunderbird to versions 15.0 or later, and ensure SeaMonkey is updated to at least 2.12. Regularly check for updates to keep your software safe! 🛡️ You've got this! By staying updated, you can protect yourself and keep your browsing safe and sound. 🚀

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.05238 · 92.5th percentile
Published
2012-08-29T10:00Z
EPSS history
Timeline
  • 29 AUG 10:00Z
    Use-after-free vulnerability in the gfxTextRun::GetUserData function in Mozilla Firefox before 15.0, Firefox ESR 10.x before 10.0.7, Thunderbird before 15.0…
    cvelistv5