Which products and versions are affected by CVE-2011-2003?

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

Is CVE-2011-2003 being exploited in the wild?

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

Is CVE-2011-2003 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-2011-2003?

Public exploit code is available.

Is there a fix for CVE-2011-2003?

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

How urgently should CVE-2011-2003 be patched?

Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.

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WatchlistCritical

CVE-2011-2003Windows 7 Memory Corruption

Buffer overflow in win32k.sys in the kernel-mode drivers in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2, R2, and R2 SP1, and Windows 7 Gold and SP1 allows remote attackers to execute arbitrary code via a crafted .fon…

Published Oct 11, 2011 · Updated Apr 28, 2026

Key Facts

Patch immediately

CVE-2011-2003 is a critical-severity vulnerability (CVSS 9.3 v2) 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. Public exploit code is available.
EPSS estimates a 27% 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 public exploit code exists for a high-severity flaw.

Scores

CVSS v2

9.3

AV:N/AC:M/Au:N/C:C/I:C/A:C

EPSS (30-day exploit likelihood)

27%

Higher than 97.9% of all scored CVEs

Exploit maturity

Proof of concept

ATLAS score

36/100

Publication score, see How it works

Exploitation Verdict

KEV listed

Not listed

Federal due date

None

No federal due date

Ransomware use

Not reported

Attributed actors

None named

Exploit & Defence Guidance

Exploit maturity

Proof of concept

Public exploit code

Proof-of-concept links

In-the-wild evidence

Reports of active use

Description

Affected Products

13 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
Oct 11, 2011
Last updated
Apr 28, 2026

Weakness Type

CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

FAQ

Common Questions.

Buffer overflow in win32k.sys in the kernel-mode drivers in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2, R2, and R2 SP1, and Windows 7 Gold and SP1 allows remote attackers to execute arbitrary code via a crafted .fon file, aka "Font Library File Buffer Overrun…
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.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.

Is CVE-2011-2003 On Your Attack Surface?

Brandefense matches it against the products discovered on your perimeter and opens a finding the day a CVE like this is listed.