Is CVE-2013-1661 being actively exploited?

CVE-2013-1661 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2013-1661?

CVE-2013-1661 has a CVSS 2.0 base score of 4.3 (MEDIUM).

CVE-2013-1661

MEDIUM · CVSS 4.3EPSS 1.1%EU EUVD

VMware ESXi 4.0 through 5.1, and ESX 4.0 and 4.1, does not properly implement the Network File Copy (NFC) protocol, which allows man-in-the-middle attackers to cause a denial of service (unhandled exception and application crash) by modifying the client-server data stream.

Key facts

CVSS score: 4.3 (v2.0)
Severity: MEDIUM
CVSS vector: AV:N/AC:M/Au:N/C:N/I:N/A:P
Weakness (CWE): CWE-20
EPSS score: 1.1% (66th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2013-1690)
Published: September 4, 2013
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2013-1690 in the EU Vulnerability Database. Last updated in EUVD on September 16, 2024.

View on the EU Vulnerability Database

Affected products

vmware / esx
vmware / esx
vmware / esxi
vmware / esxi
vmware / esxi
vmware / esxi
vmware / esxi
vmware / esxi
vmware / esxi
vmware / esxi
vmware / esxi
vmware / esxi
vmware / esxi
vmware / esxi

References

http://www.vmware.com/security/advisories/VMSA-2013-0011.html(Vendor Advisory)

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

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