CVE-2006-2559

critical

Description

Linksys WRT54G Wireless-G Broadband Router allows remote attackers to bypass access restrictions and conduct unauthorized operations via a UPnP request with a modified InternalClient parameter, which is not validated, as demonstrated by using AddPortMapping to forward arbitrary traffic.

References

https://exchange.xforce.ibmcloud.com/vulnerabilities/26707

http://www.vupen.com/english/advisories/2006/1909

http://www.securityview.org/how-does-the-upnp-flaw-works.html

http://www.securityview.org/dutch-student-finds-a-bug-in-upnp.html

http://securitytracker.com/id?1016134

http://secunia.com/advisories/20161

Details

Source: Mitre, NVD

Published: 2006-05-24

Updated: 2026-06-16

Risk Information

CVSS v2

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Severity: High

CVSS v3

Base Score: 9.1

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Severity: Critical

EPSS

EPSS: 0.00531