An issue was discovered in tnef before 1.4.13. Two OOB Writes have been identified in src/mapi_attr.c:mapi_attr_read(). These might lead to invalid read and write operations, controlled by an attacker.
https://www.x41-dsec.de/lab/advisories/x41-2017-004-tnef/
https://security.gentoo.org/glsa/201708-02
https://github.com/verdammelt/tnef/commit/1a17af1ed0c791aec44dbdc9eab91218cc1e335a
https://github.com/verdammelt/tnef/blob/master/ChangeLog