The remote host is missing an update to the system as announced in the referenced advisory.

Update your system with the appropriate patches or software upgrades. https://www.mozilla.org/security/announce/2012/mfsa2012-11.html http://www.vuxml.org/freebsd/d7dbd2db-599c-11e1-a2fb-14dae9ebcf89.html

The following packages are affected: firefox linux-firefox linux-seamonkey linux-thunderbird seamonkey thunderbird CVE-2011-3026 Integer overflow in libpng, as used in Google Chrome before 17.0.963.56, allows remote attackers to cause a denial of service or possibly have unspecified other impact via unknown vectors that trigger an integer truncation.