CVE Vulnerabilities


Use of Externally-Controlled Format String

Published: Apr 22, 2002 | Modified: Oct 18, 2016
CVSS 3.x
CVSS 2.x
7.5 HIGH

Format string vulnerability in the administration function in Cisco Secure Access Control Server (ACS) for Windows, 2.6.x and earlier and 3.x through 3.01 (build 40), allows remote attackers to crash the CSADMIN module only (denial of service of administration function) or execute arbitrary code via format strings in the URL to port 2002.


The software uses a function that accepts a format string as an argument, but the format string originates from an external source.

Affected Software

Name Vendor Start Version End Version
Secure_access_control_server Cisco 2.6 2.6
Secure_access_control_server Cisco 2.6.2 2.6.2
Secure_access_control_server Cisco 2.6.3 2.6.3
Secure_access_control_server Cisco 2.6.4 2.6.4
Secure_access_control_server Cisco 3.0 3.0
Secure_access_control_server Cisco 3.0.1 3.0.1

Extended Description

When an attacker can modify an externally-controlled format string, this can lead to buffer overflows, denial of service, or data representation problems. It should be noted that in some circumstances, such as internationalization, the set of format strings is externally controlled by design. If the source of these format strings is trusted (e.g. only contained in library files that are only modifiable by the system administrator), then the external control might not itself pose a vulnerability.

Potential Mitigations