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Vulnerability record · CVE-2005-4499 · published 22 December 2005

CVE-2005-4499: Cisco vpn 3001 concentrator vulnerability

Cisco · Vpn 3001 Concentrator

The Downloadable RADIUS ACLs feature in Cisco PIX and VPN 3000 concentrators, when creating an ACL on the Cisco Secure Access Control Server (CS ACS), generates a random internal name for an ACL that is also used as a hidden user name and password, which allows remote attackers to gain privileges by sniffing the username from the cleartext portion of a RADIUS session, then using the password to log in to another device that uses CS ACS.

7.5 CVSS 2.0 High EPSS 2.6% · top 15.3%
7.5CVSS 2.0 base score
2.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
21Affected product versions listed by NVD
12References
16 Jun 2026Last modified by NVD

Description

The Downloadable RADIUS ACLs feature in Cisco PIX and VPN 3000 concentrators, when creating an ACL on the Cisco Secure Access Control Server (CS ACS), generates a random internal name for an ACL that is also used as a hidden user name and password, which allows remote attackers to gain privileges by sniffing the username from the cleartext portion of a RADIUS session, then using the password to log in to another device that uses CS ACS.

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

Affected products

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

References

LinkTags
http://secunia.com/advisories/18141
http://www.cisco.com/en/US/products/sw/secursw/ps2086/products_field_notice09186a00805bf1c4.shtml
http://www.osvdb.org/22193
http://www.securityfocus.com/archive/1/420020/100/0/threaded
http://www.securityfocus.com/archive/1/420103/100/0/threaded
http://www.securityfocus.com/bid/16025
http://secunia.com/advisories/18141
http://www.cisco.com/en/US/products/sw/secursw/ps2086/products_field_notice09186a00805bf1c4.shtml
http://www.osvdb.org/22193
http://www.securityfocus.com/archive/1/420020/100/0/threaded
http://www.securityfocus.com/archive/1/420103/100/0/threaded
http://www.securityfocus.com/bid/16025

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Source: NIST National Vulnerability Database (record CVE-2005-4499), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.