CVE-2001-1056

Severity: high (CVSS 7.5 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2001-07-30 · updated 2026-06-16

Description

IRC DCC helper in the ip_masq_irc IP masquerading module 2.2 allows remote attackers to bypass intended firewall restrictions by causing the target system to send a "DCC SEND" request to a malicious server which listens on port 6667, which may cause the module to believe that the traffic is a valid request and allow the connection to the port specified in the DCC SEND request.

Affected products

Linux kernel: from 2.0.1 (excl.) through 2.0.18; from 2.2.0 through 2.2.18

References

http://archives.neohapsis.com/archives/bugtraq/2001-07/0733.html
http://archives.neohapsis.com/archives/bugtraq/2001-07/0750.html
http://www.iss.net/security_center/static/6923.php
http://www.osvdb.org/1916
http://www.securityfocus.com/bid/3117
http://archives.neohapsis.com/archives/bugtraq/2001-07/0733.html
http://archives.neohapsis.com/archives/bugtraq/2001-07/0750.html
http://www.iss.net/security_center/static/6923.php
http://www.osvdb.org/1916
http://www.securityfocus.com/bid/3117

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