Is CVE-2011-2013 being actively exploited?

CVE-2011-2013 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2011-2013?

CVE-2011-2013 has a CVSS 3.1 base score of 9.8 (CRITICAL).

CVE-2011-2013

CRITICAL · CVSS 9.8EPSS 32.3%EU EUVD

Integer overflow in the TCP/IP implementation in Microsoft Windows Vista SP2, Windows Server 2008 SP2, R2, and R2 SP1, and Windows 7 Gold and SP1 allows remote attackers to execute arbitrary code by sending a sequence of crafted UDP packets to a closed port, aka "Reference Counter Overflow Vulnerability."

Key facts

CVSS score: 9.8 (v3.1)
Severity: CRITICAL
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-189
EPSS score: 32.3% (98th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2011-2007)
Published: November 8, 2011
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2011-2007 in the EU Vulnerability Database. Last updated in EUVD on October 17, 2024.

View on the EU Vulnerability Database

Affected products

microsoft / windows 7
microsoft / windows 7
microsoft / windows 7
microsoft / windows server 2008
microsoft / windows server 2008
microsoft / windows server 2008
microsoft / windows server 2008
microsoft / windows server 2008
microsoft / windows vista

Certified products that may be affected

14 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Windows 7 BitLocker™ Drive Encryption - Microsoft Corporation - FIPS 140 1332 - historical
Microsoft Windows 7 Kernel Mode Cryptographic Primitives Library (cng.sys) - Microsoft Corporation - FIPS 140 1328 - historical
Microsoft Windows Vista Kernel Mode Security Support Provider Interface (ksecdd.sys) - Microsoft Corporation - FIPS 140 1000 - historical
Microsoft Windows Vista Cryptographic Primitives Library (bcrypt.dll) - Microsoft Corporation - FIPS 140 1001 - historical
Windows Vista Enhanced Cryptographic Provider (RSAENH) - Microsoft Corporation - FIPS 140 1002 - historical

See all 14 in the Security Certifications Explorer.

References

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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