CVE-2026-4211
Description
A weakness has been identified 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. The attack can be initiated remotely. The exploit has been made available to the public and could be used for attacks.
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| dlink dnr-202l_firmware | v ≤ 2026-02-05 | — |
| dlink dnr-326_firmware | v ≤ 2026-02-05 | — |
| dlink dns-1100-4_firmware | v ≤ 2026-02-05 | — |
| dlink dns-120_firmware | v ≤ 2026-02-05 | — |
| dlink dns-1200-05_firmware | v ≤ 2026-02-05 | — |
| dlink dns-1550-04_firmware | v ≤ 2026-02-05 | — |
| dlink dns-315l_firmware | v ≤ 2026-02-05 | — |
| dlink dns-320_firmware | v ≤ 2026-02-05 | — |
| dlink dns-320l_firmware | v ≤ 2026-02-05 | — |
| dlink dns-320lw_firmware | v ≤ 2026-02-05 | — |
| dlink dns-321_firmware | v ≤ 2026-02-05 | — |
| dlink dns-322l_firmware | v ≤ 2026-02-05 | — |
| dlink dns-323_firmware | v ≤ 2026-02-05 | — |
| dlink dns-325_firmware | v ≤ 2026-02-05 | — |
| dlink dns-326_firmware | v ≤ 2026-02-05 | — |
| dlink dns-327l_firmware | v ≤ 2026-02-05 | — |
| dlink dns-340l_firmware | v ≤ 2026-02-05 | — |
| dlink dns-343_firmware | v ≤ 2026-02-05 | — |
| dlink dns-345_firmware | v ≤ 2026-02-05 | — |
| dlink dns-726-4_firmware | v ≤ 2026-02-05 | — |
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