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Vulnerability · Published Mar 16, 2026 · Assigned by VulDB

CVE-2026-4211D-Link DNS-1550-04 local_backup_mgr.cgi Local_Backup_Info stack-based overflow

High 8.8

In plain English

A high-severity stack buffer overflow in DNR-202L from D-Link. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 58% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.8%top 42.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

VendorProductVersions
D-Link DNS-120 20260205
D-Link DNR-202L 20260205
D-Link DNS-315L 20260205
D-Link DNS-320 20260205
D-Link DNS-320L 20260205
D-Link DNS-320LW 20260205
D-Link DNS-321 20260205
D-Link DNR-322L 20260205
D-Link DNS-323 20260205
D-Link DNS-325 20260205
D-Link DNS-326 20260205
D-Link DNS-327L 20260205
D-Link DNR-326 20260205
D-Link DNS-340L 20260205
D-Link DNS-343 20260205
D-Link DNS-345 20260205
D-Link DNS-726-4 20260205
D-Link DNS-1100-4 20260205
D-Link DNS-1200-05 20260205
D-Link DNS-1550-04 20260205

Weakness: CWE-121, CWE-119 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R

References