CVE-2009-1920

The JScript scripting engine 5.1, 5.6, 5.7, and 5.8 in JScript.dll in Microsoft Windows, as used in Internet Explorer, does not properly load decoded scripts…

published September 8, 2009

CVSS
—
EPSS
22%
Percentile
97.6
In the wild
Unconfirmed
What it is

🚨 A twisted web of memory corruption is lurking in JScript versions 5.1 to 5.8! Remote attackers can exploit this flaw through crafted websites, and it can lead to arbitrary code execution. 🔥 Think of it like a restaurant that serves food without checking for allergens. If the chef doesn’t verify the ingredients, a sneaky attacker could slip in a dangerous substance, leading to a disastrous meal for the unsuspecting diners. An attacker could craft a malicious website that, when visited, could execute arbitrary code on the victim's machine. This means they could essentially take control of your computer, steal sensitive information, or wreak havoc, all thanks to a flaw in the way JScript processes scripts in memory.

Put simply

Think of it like a restaurant that serves food without checking for allergens. If the chef doesn’t verify the ingredients, a sneaky attacker could slip in a dangerous substance, leading to a disastrous meal for the unsuspecting diners. The vulnerability arises because the JScript scripting engine does not properly load decoded scripts into memory before execution. This mishap can result in memory corruption, thus allowing attackers to run harmful code remotely.

What to do

An attacker could craft a malicious website that, when visited, could execute arbitrary code on the victim's machine. This means they could essentially take control of your computer, steal sensitive information, or wreak havoc, all thanks to a flaw in the way JScript processes scripts in memory. To mitigate this risk, ensure that your environment is updated to use the latest version of JScript and Internet Explorer. It's also a good idea to implement a robust web filtering solution to block access to potentially malicious websites. You've got this! Stay vigilant, keep your systems updated, and you'll thwart those hackers in no time! 🛡️

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.21507 · 97.6th percentile
Published
2009-09-08T22:00Z
EPSS history
Timeline
  • 08 SEP 22:00Z
    The JScript scripting engine 5.1, 5.6, 5.7, and 5.8 in JScript.dll in Microsoft Windows, as used in Internet Explorer, does not properly load decoded scripts…
    cvelistv5