CVE-2020-17144KEV · OVERDUE

Microsoft Exchange Remote Code Execution Vulnerability

High · published December 9, 2020

Patch now

Confirmed exploited, and the score agrees

CVSS calls it high at 8.4. It is confirmed in active exploitation. It sits in the 98.5th percentile for exploit probability.

1635
days past CISA
deadline
CVSS v3.1
8.4
EPSS
37%
Percentile
98.5
In the wild
Confirmed
What it is

🚨 Microsoft Exchange has a remote code execution vulnerability that’s currently being exploited in the wild—think of it as an open door for attackers! 🔥 Imagine a restaurant where the chef doesn’t check the orders coming in. An attacker can send a fake order, and suddenly, they’re cooking up malicious meals instead! This vulnerability allows an attacker to run arbitrary code on the affected server. They could potentially access confidential data, modify emails, or even take full control of your Exchange environment—absolutely devastating!

Put simply

Imagine a restaurant where the chef doesn’t check the orders coming in. An attacker can send a fake order, and suddenly, they’re cooking up malicious meals instead! CVE-2020-17144 is a remote code execution vulnerability that occurs when the Microsoft Exchange server fails to properly handle requests. An authenticated attacker can exploit this flaw to execute arbitrary code with elevated privileges.

What to do

This vulnerability allows an attacker to run arbitrary code on the affected server. They could potentially access confidential data, modify emails, or even take full control of your Exchange environment—absolutely devastating! To protect your systems, immediately apply the latest security patches from Microsoft. Upgrade to at least the version 15.2 (Build 1024.0) or later, and ensure that your security protocols are robust and well-monitored. You’ve got this! By following these steps, you’ll fortify your defenses and keep your Exchange server secure! 🛡️

The record
Technical detail
CVSS v3.1
8.4 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C
CVSS v4.0
Not supplied
EPSS
0.36514 · 98.5th percentile
Published
2020-12-09T23:36Z
KEV added
2021-11-03 · due 2022-05-03
EPSS history
Timeline
  • 03 NOV 00:00Z
    Added to CISA KEV — remediate by May 3
    kev
  • 09 DEC 23:36Z
    Microsoft Exchange Remote Code Execution Vulnerability
    cvelistv5