Which products and versions are affected by CVE-2011-0657?

Affected: Windows 2003 Server (Microsoft); Windows 7 (Microsoft); Windows Server 2003 (Microsoft), among others. The full list is in the CVE brief.

Is CVE-2011-0657 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2011-0657 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2011-0657?

No public exploit code is known.

Is there a fix for CVE-2011-0657?

No fixed version is listed yet; check the vendor advisory for mitigations.

How urgently should CVE-2011-0657 be patched?

Brandefense priority: patch immediately, because it is very likely to be exploited soon.

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Vulnerability Intelligence

CVE-2011-0657

Critical

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 SP1, and Windows 7 Gold and SP1 does not properly process DNS queries, which allows remote attackers to execute…

Published Apr 13, 2011 · Updated Apr 28, 2026

Key Facts

Patch immediately

CVE-2011-0657 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Windows 2003 Server (Microsoft), Windows 7 (Microsoft), Windows Server 2003 (Microsoft) and 3 more products.
It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
EPSS estimates a 62% probability of exploitation in the next 30 days.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

CVSS v3.1

9.8

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS (30-day exploit likelihood)

62%

Higher than 99.1% of all scored CVEs

Exploited in the wild

No known

Not in a known-exploited catalog

Public exploit code

None known

Get the full CVE-2011-0657 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

Affected Products

18 affected entries in total

Product	Affected versions	Fixed in
Windows 2003 ServerMicrosoft	See advisory	n/a
Windows 7Microsoft	See advisory	n/a
Windows Server 2003Microsoft	See advisory	n/a
Windows Server 2008Microsoft	r2	n/a
Windows VistaMicrosoft	See advisory	n/a

1 more affected products in the full CVE brief

Timeline

Publicly disclosed
Apr 13, 2011
Last updated
Apr 28, 2026

Weakness Type

CWE-20 Improper Input Validation

References

3 more references in the full CVE brief

FAQ

Common Questions.

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 SP1, and Windows 7 Gold and SP1 does not properly process DNS queries, which allows remote attackers to execute arbitrary code via (1) a crafted LLMNR broadcas…
Affected: Windows 2003 Server (Microsoft); Windows 7 (Microsoft); Windows Server 2003 (Microsoft), among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

Is CVE-2011-0657 Running On Your Attack Surface?

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