finger allows recursive searches by using a long string of @ symbols.
https://www.cve.org/CVERecord?id=CVE-1999-0105
Source: Mitre, NVD
Published: 1997-03-01
Updated: 2022-08-17
Base Score: 2.1
Vector: CVSS2#AV:L/AC:L/Au:N/C:N/I:N/A:P
Severity: Low
Base Score: 7.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Severity: High