socat 1.2.0.0 before 1.7.2.2 and 2.0.0-b1 before 2.0.0-b6, when used for a listen type address and the fork option is enabled, allows remote attackers to cause a denial of service (file descriptor consumption) via multiple request that are refused based on the (1) sourceport, (2) lowport, (3) range, or (4) tcpwrap restrictions.

References

• https://nvd.nist.gov/vuln/detail/CVE-2013-3571
• http://www.dest-unreach.org/socat/contrib/socat-secadv4.html
• http://www.mandriva.com/security/advisories?name=MDVSA-2013:169
• http://www.openwall.com/lists/oss-security/2013/05/26/1