Is CVE-2007-4991 being actively exploited?

CVE-2007-4991 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2007-4991?

CVE-2007-4991 has a CVSS 2.0 base score of 5.0 (MEDIUM).

CVE-2007-4991

MEDIUM · CVSS 5.0EPSS 16.1%EU EUVD

The SOCKS4 Proxy in Microsoft Internet Security and Acceleration (ISA) Server 2004 SP1 and SP2 allows remote attackers to obtain potentially sensitive information (the destination IP address of another user's session) via an empty packet.

Key facts

CVSS score: 5.0 (v2.0)
Severity: MEDIUM
CVSS vector: AV:N/AC:L/Au:N/C:P/I:N/A:N
Weakness (CWE): CWE-200
EPSS score: 16.1% (97th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2007-4972)
Published: September 21, 2007
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2007-4972 in the EU Vulnerability Database. Last updated in EUVD on August 7, 2024.

View on the EU Vulnerability Database

Affected products

microsoft / isa server
microsoft / isa server

References

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

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