Home/CVE/A weakness has been identified in D-Link DNS-120, DNR-202L, DNS-315L, DNS-320, DNS-320L, DNS-320LW, DNS-321, DNR-322L, D
CVE

CVE-2026-4211

A weakness has been identified in D-Link DNS-120, DNR-202L, DNS-315L, DNS-320, DNS-320L, DNS-320LW, DNS-321, DNR-322L, D

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.

HIGH · CVSS 8.8 EPSS 0.00069
Act now
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-121Stack-based Buffer Overflow
CWE-787Out-of-bounds Write
▤

Affected Products & Versions

20
dlink dnr-202l firmware<= 2026-02-05
dlink dnr-326 firmware<= 2026-02-05
dlink dns-1100-4 firmware<= 2026-02-05
dlink dns-120 firmware<= 2026-02-05
dlink dns-1200-05 firmware<= 2026-02-05
dlink dns-1550-04 firmware<= 2026-02-05
dlink dns-315l firmware<= 2026-02-05
dlink dns-320 firmware<= 2026-02-05
⚠

Public Exploits & PoCs

1
pocgithub.com · 160.mdgithub.com
▣

Scoring & Timeline

8.8
HIGH · CVSS v3.1 · cna@vuldb.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD16 Mar 2026 · 02:20 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
poc
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

4
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://vuldb.com/?ctiid.351122Permissions RequiredVDB Entry
https://vuldb.com/?id.351122Third Party AdvisoryVDB Entry
https://vuldb.com/?submit.770441Third Party AdvisoryVDB Entry
https://www.dlink.com/Product
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