CVE-2020-15999KEV · OVERDUE

Google Chrome FreeType Heap Buffer Overflow Vulnerability

Critical · published November 3, 2020

Patch now

Confirmed exploited, and the score agrees

CVSS calls it critical at 9.6. It is confirmed in active exploitation. It sits in the 99.2th percentile for exploit probability.

1802
days past CISA
deadline
CVSS v3.1
9.6
EPSS
64%
Percentile
99.2
In the wild
Confirmed
What it is

🔥 A crafty HTML page can trigger a heap buffer overflow in Freetype that's lurking in Google Chrome versions before 86.0.4240.111! Think of it like a delivery truck that gets overloaded with too many packages, causing it to tip over and spill everywhere. In this case, an attacker can craft a page that overwhelms the heap memory, leading to unforeseen consequences. This vulnerability could allow a remote attacker to manipulate heap memory, potentially enabling them to execute arbitrary code on the user's machine. The implications are not just alarming; an attacker could gain full control of the browser, steal sensitive data, or infect the system with malware. It's absolutely devastating if exploited!

Put simply

Think of it like a delivery truck that gets overloaded with too many packages, causing it to tip over and spill everywhere. In this case, an attacker can craft a page that overwhelms the heap memory, leading to unforeseen consequences. The heap buffer overflow in Freetype allows attackers to corrupt memory through crafted HTML content, thus enabling them to execute code remotely. This flaw exists in Google Chrome prior to version 86.0.4240.111.

What to do

This vulnerability could allow a remote attacker to manipulate heap memory, potentially enabling them to execute arbitrary code on the user's machine. The implications are not just alarming; an attacker could gain full control of the browser, steal sensitive data, or infect the system with malware. It's absolutely devastating if exploited! To protect yourself, update Google Chrome to version 86.0.4240.111 or later immediately. Make sure to enable automatic updates, and consider employing additional security measures like disabling JavaScript on untrusted sites. Staying informed on browsers and their vulnerabilities is key! You've got this! Follow these steps to secure your browser and keep those pesky attackers at bay. 🛡️

The record
Technical detail
CVSS v3.1
9.6 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.63894 · 99.2th percentile
Published
2020-11-03T00:00Z
KEV added
2021-11-03 · due 2021-11-17
EPSS history
Timeline
  • 04 OCT 03:12Z
    EPSS moved 44% → 64%
    epss
  • 03 NOV 00:00Z
    Added to CISA KEV — remediate by Nov 17
    kev
  • 03 NOV 00:00Z
    Heap buffer overflow in Freetype in Google Chrome prior to 86.0.4240.111 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML…
    cvelistv5