CVE-2021-26893

CVE-2021-26893

Critical · published March 11, 2021

CVSS v3.1
9.8
EPSS
7%
Percentile
94.2
In the wild
Unconfirmed
What it is

🚨 A remote code execution vulnerability lurks in the Windows DNS Server, ready to unleash chaos with just one crafted DNS request! 🔥 Think of it as a service desk that accepts any caller's request without verifying their identity—an open invitation to anyone looking to wreak havoc. With this flaw, cyber villains can send commands that the server will execute without question, leading to a potential security disaster. If exploited, attackers could gain control of the server, executing malicious code that could compromise sensitive data, alter configurations, or even disrupt services. The consequences could be absolutely devastating for organizations relying on the DNS server for their operations.

Put simply

Think of it as a service desk that accepts any caller's request without verifying their identity—an open invitation to anyone looking to wreak havoc. With this flaw, cyber villains can send commands that the server will execute without question, leading to a potential security disaster. This vulnerability allows an attacker to send specially crafted packets to the Windows DNS server, which processes them without proper validation, leading to the execution of arbitrary code.

What to do

If exploited, attackers could gain control of the server, executing malicious code that could compromise sensitive data, alter configurations, or even disrupt services. The consequences could be absolutely devastating for organizations relying on the DNS server for their operations. To safeguard your systems, immediately update Windows DNS Server to the latest patch that addresses this vulnerability. Ensure your systems are configured with strict access controls to limit who can send requests to the server. Regularly audit your security settings to stay ahead of any potential threats. You've got this! With these steps, you'll strengthen your defenses and keep your network secure. 🛡️

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
0.07020 · 94.2th percentile
Published
2021-03-11T21:15Z
Affected products (9)
ProductVersionsFixed in
microsoft/windows_server_2008all versions—
microsoft/windows_server_2008all versions—
microsoft/windows_server_2012all versions—
microsoft/windows_server_2012all versions—
microsoft/windows_server_2016all versions—
microsoft/windows_server_2016all versions—
microsoft/windows_server_2016all versions—
microsoft/windows_server_2016all versions—
microsoft/windows_server_2019all versions—
References (2)
EPSS history
Timeline
  • 11 MAR 15:42Z
    Windows DNS Server Remote Code Execution Vulnerability
    cvelistv5