CVE-2011-0657

DNSAPI.dll in the DNS client in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, R2, and R2…

Critical · published April 13, 2011

Patch now

High probability of exploitation

CVSS calls it critical at 9.8. It sits in the 99.2th percentile for exploit probability.

CVSS v3.1
9.8
EPSS
62%
Percentile
99.2
In the wild
Unconfirmed
What it is

🔥 A crafted LLMNR broadcast can turn your Windows systems into unwitting accomplices for attackers! Think of it like a delivery driver who accepts any package without verifying the sender — they might just deliver something malicious right to your doorstep! An attacker can execute arbitrary code on your system, leading to absolute chaos: stealing sensitive data, installing malware, or taking over your entire machine. This vulnerability is a ticket to a backdoor that can compromise your network security!

Put simply

Think of it like a delivery driver who accepts any package without verifying the sender — they might just deliver something malicious right to your doorstep! The DNSAPI.dll in multiple Windows versions fails to properly process DNS queries, allowing attackers to exploit this weakness through crafted requests, resulting in remote code execution without proper validation.

What to do

An attacker can execute arbitrary code on your system, leading to absolute chaos: stealing sensitive data, installing malware, or taking over your entire machine. This vulnerability is a ticket to a backdoor that can compromise your network security! Update your Windows systems to the latest security patches immediately, specifically targeting the affected versions (Windows XP SP2/SP3, Server 2003 SP2, Vista SP1/SP2, Server 2008, and Windows 7 SP1). Additionally, reinforce your network defenses by disabling LLMNR if it's not needed. You can tackle this vulnerability! Follow the steps to secure your systems and keep those pesky attackers at bay. 🛡️

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
0.62495 · 99.2th percentile
Published
2011-04-13T18:00Z
EPSS history
Timeline
  • 13 APR 18:00Z
    DNSAPI.dll in the DNS client in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, R2, and R2…
    cvelistv5