CVE-2011-1248Windows Server 2003 Vulnerability
WINS in Microsoft Windows Server 2003 SP2 and Server 2008 Gold, SP2, R2, and R2 SP1 does not properly handle socket send exceptions, which allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via crafted packets, related to…
Published May 13, 2011 · Updated Apr 28, 2026
Key Facts
Patch immediately- CVE-2011-1248 is a critical-severity vulnerability (CVSS 9.3 v2) affecting Windows Server 2003 (Microsoft), Windows Server 2008 (Microsoft).
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 48% 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)
48%
Higher than 98.8% of all scored CVEs
Exploit maturity
Proof of concept
ATLAS score
40/100
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
1
Proof-of-concept links
In-the-wild evidence
0
Reports of active use
Description
WINS in Microsoft Windows Server 2003 SP2 and Server 2008 Gold, SP2, R2, and R2 SP1 does not properly handle socket send exceptions, which allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via crafted packets, related to unintended stack-frame values and buffer passing, aka "WINS Service Failed Response Vulnerability."
Affected Products
6 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Windows Server 2003Microsoft | See advisory | n/a |
| Windows Server 2008Microsoft | r2 | n/a |
Timeline
Publicly disclosed
May 13, 2011
Last updated
Apr 28, 2026
Weakness Type
- CWE-20 Improper Input Validation
References
- exploitExploitDB-17830
- otherMS11-035
- otheroval:org.mitre.oval:def:12724
FAQ
Common Questions.
WINS in Microsoft Windows Server 2003 SP2 and Server 2008 Gold, SP2, R2, and R2 SP1 does not properly handle socket send exceptions, which allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via crafted packets, related to unintended stack-frame values and buffer passing,…
Affected: Windows Server 2003 (Microsoft); Windows Server 2008 (Microsoft) versions r2. 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-2011-1248 On Your Attack Surface?
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