In FreeBSD 12.0-STABLE before r349622, 12.0-RELEASE before 12.0-RELEASE-p7, 11.3-PRERELEASE before r349624, 11.3-RC3 before 11.3-RC3-p1, and 11.2-RELEASE before 11.2-RELEASE-p11, a bug in iconv implementation may allow an attacker to write past the end of an output buffer. Depending on the implementation, an attacker may be able to create a denial of service, provoke incorrect program behavior, or induce a remote code execution.
https://security.FreeBSD.org/advisories/FreeBSD-SA-19:09.iconv.asc
http://packetstormsecurity.com/files/153520/FreeBSD-Security-Advisory-FreeBSD-SA-19-09.iconv.html