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Vulnerability record · CVE-2007-4991 · published 21 September 2007

CVE-2007-4991: Microsoft isa server information exposure vulnerability

Microsoft · Isa Server

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.

5.0 CVSS 2.0 Medium EPSS 16% · top 3.2% CWE-200 · Information exposure
5.0CVSS 2.0 base score
16%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References
16 Jun 2026Last modified by NVD

Description

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.

AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://osvdb.org/45906
http://www.securityfocus.com/bid/25753 Patch
http://www.securitytracker.com/id?1018727
http://www.zerodayinitiative.com/advisories/ZDI-07-053.html PatchVendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/36715
http://osvdb.org/45906
http://www.securityfocus.com/bid/25753 Patch
http://www.securitytracker.com/id?1018727
http://www.zerodayinitiative.com/advisories/ZDI-07-053.html PatchVendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/36715

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2007-4991), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.