Martin Lambers mpop before 1.0.19 when OpenSSL is used does not properly handle a '\\0' character in a domain name in the (1) subject's Common Name or (2) Subject Alternative Name field of an X.509 certificate which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority a related issue to CVE-2009-2408.