In Wireshark 2.6.0 to 2.6.5 and 2.4.0 to 2.4.11, the RTSE dissector and other ASN.1 dissectors could crash. This was addressed in epan/charsets.c by adding a get_t61_string length check.
https://www.wireshark.org/security/wnpa-sec-2019-03.html
https://www.oracle.com/security-alerts/cpujan2020.html
https://www.debian.org/security/2019/dsa-4416
https://seclists.org/bugtraq/2019/Mar/35
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=15373
http://www.securityfocus.com/bid/106482
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00027.html