user_login.cgi on Draytek Vigor2620 devices before 3.9.8.4 (and on all versions of Vigor2925 devices) allows attackers to send a crafted payload to modify the content of the code segment, insert shellcode, and execute arbitrary code.
https://gist.github.com/rrrrrrri/013c9eef64b265af4163478bfcf29ff4
https://www.forescout.com/resources/draybreak-draytek-research/
https://draytek.com
Source: Mitre, NVD
Published: 2023-08-21
Updated: 2026-06-17
Base Score: 10
Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C
Severity: Critical
Base Score: 9.8
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.00884