CVE-2021-42237KEV · OVERDUE

Sitecore XP Remote Command Execution Vulnerability

Critical · published November 5, 2021

Patch now

Confirmed exploited, and the score agrees

CVSS calls it critical at 9.8. It is confirmed in active exploitation. It sits in the 99.9th percentile for exploit probability.

1654
days past CISA
deadline
CVSS v3.1
9.8
EPSS
98%
Percentile
99.9
In the wild
Confirmed
What it is

🚨 An insecure deserialization vulnerability in Sitecore could let attackers execute commands on your server without breaking a sweat! 🔥 Think of it as a restaurant that prepares any dish just from a handwritten note without checking the recipe—anyone can submit their order and get a gourmet meal made from the chef's kitchen! An attacker can exploit this weakness to remotely execute any command on your system, potentially compromising sensitive data or taking complete control over the server. The consequences could be absolutely devastating, leaving your systems vulnerable to data breaches, service interruptions, and catastrophic trust breakdowns with your users.

Put simply

Think of it as a restaurant that prepares any dish just from a handwritten note without checking the recipe—anyone can submit their order and get a gourmet meal made from the chef's kitchen! This vulnerability is due to insecure deserialization in Sitecore XP versions from 7.5 to 8.2 Update-7, allowing remote command execution without any authentication required, making it a prime target for attackers.

What to do

An attacker can exploit this weakness to remotely execute any command on your system, potentially compromising sensitive data or taking complete control over the server. The consequences could be absolutely devastating, leaving your systems vulnerable to data breaches, service interruptions, and catastrophic trust breakdowns with your users. To protect your systems, urgently upgrade to Sitecore XP version 8.2 Update-8 or later. Make sure to review your configurations and implement security best practices around deserialization. Don't forget to monitor for any suspicious activity post-upgrade! You've got this! By taking these steps, you'll be one step closer to securing your environment. 🛡️

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.97566 · 99.9th percentile
Published
2021-11-05T09:51Z
KEV added
2022-03-25 · due 2022-04-15
EPSS history
Timeline
  • 25 MAR 00:00Z
    Added to CISA KEV — remediate by Apr 15
    kev
  • 05 NOV 09:51Z
    Sitecore XP 7.5 Initial Release to Sitecore XP 8.2 Update-7 is vulnerable to an insecure deserialization attack where it is possible to achieve remote command…
    cvelistv5