CVE-2026-4211 | D-Link DNS-1550-04 up to 20260205 local_backup_mgr.cgi Local_Backup_Info f_idx stack-based overflow

A vulnerability, which was classified as critical, has been found in D-Link DNS-120, DNR-202L, DNS-315L, DNS-320, DNS-320L, DNS-320LW, DNS-321, DNR-322L, DNS-323, DNS-325, DNS-326, DNS-327L, DNR-326, DNS-340L, DNS-343, DNS-345, DNS-726-4, DNS-1100-4, DNS-1200-05 and DNS-1550-04 up to 20260205. Affected by this issue is the function Local_Backup_Info of the file /cgi-bin/local_backup_mgr.cgi. This manipulation of the argument f_idx causes stack-based buffer overflow.

This vulnerability is handled as CVE-2026-4211. The attack can be initiated remotely. Additionally, an exploit exists.