Nagios NRPE 3.2.1 has a Heap-Based Buffer Overflow, as demonstrated by interpretation of a small negative number as a large positive number during a bzero call.
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2DNGKXVDB43E3KQRA6W5QZT3Z46XZLQM/
https://herolab.usd.de/security-advisories/
https://herolab.usd.de/security-advisories/usd-2020-0001/
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6582