CVE-2021-21109

Use after free in payments in Google Chrome prior to 87.0.4280.141 allowed a remote attacker who had compromised the renderer process to potentially perform a…

published January 8, 2021

CVSS
—
EPSS
1%
Percentile
70.9
In the wild
Unconfirmed
What it is

⚠️ A simple crafted HTML page could lead to a wild ride! This use-after-free vulnerability in Google Chrome prior to version 87.0.4280.141 lets attackers potentially escape the sandbox like a magician pulling a rabbit out of a hat! 🎩 Think of it as a restaurant where the chef mistakenly keeps an old menu item in circulation. When a waiter brings it back, the chef could be serving a dish that’s gone bad—resulting in quite the unpleasant surprise for diners! In the same way, this flaw allows attackers to mishandle memory, leading to unexpected behaviors. An attacker could use this vulnerability to escape the tightly controlled environment of the browser, potentially leading to unauthorized access to sensitive information. It's a pathway that could allow the attacker to break out of the restrictions imposed on their actions, turning the browser into a playground of possibilities for malicious activities.

Put simply

Think of it as a restaurant where the chef mistakenly keeps an old menu item in circulation. When a waiter brings it back, the chef could be serving a dish that’s gone bad—resulting in quite the unpleasant surprise for diners! In the same way, this flaw allows attackers to mishandle memory, leading to unexpected behaviors. This use-after-free vulnerability occurs when the Chrome renderer process mishandles memory, allowing an attacker to exploit the flaw through a specially crafted HTML page, effectively compromising the browser's security model.

What to do

An attacker could use this vulnerability to escape the tightly controlled environment of the browser, potentially leading to unauthorized access to sensitive information. It's a pathway that could allow the attacker to break out of the restrictions imposed on their actions, turning the browser into a playground of possibilities for malicious activities. Upgrade Google Chrome to version 87.0.4280.141 or later immediately to patch this vulnerability. Regularly check for updates to ensure your browser remains secure against evolving threats. It's also wise to encourage users not to open suspicious links or pages that could be crafted to exploit this bug. You've got this! Stay vigilant and keep your browser updated to keep those pesky attackers at bay! 🛡️

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.01333 · 70.9th percentile
Published
2021-01-08T17:56Z
EPSS history
Timeline
  • 08 JAN 17:56Z
    Use after free in payments in Google Chrome prior to 87.0.4280.141 allowed a remote attacker who had compromised the renderer process to potentially perform a…
    cvelistv5