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CVE-2026-4211

D-Link Dnr-202l Firmware buffer overflow

8.8 HIGHPublic exploitEPSS 1.41%
  1. Published16 Mar 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

D-Link Dnr-202l Firmware≤ 2026-02-05
D-Link Dnr-326 Firmware≤ 2026-02-05
D-Link Dns-1100-4 Firmware≤ 2026-02-05
D-Link Dns-1200-05 Firmware≤ 2026-02-05
D-Link Dns-120 Firmware≤ 2026-02-05
D-Link Dns-1550-04 Firmware≤ 2026-02-05
D-Link Dns-315l Firmware≤ 2026-02-05
D-Link Dns-320 Firmware≤ 2026-02-05
D-Link Dns-320l Firmware≤ 2026-02-05
D-Link Dns-320lw Firmware≤ 2026-02-05
D-Link Dns-321 Firmware≤ 2026-02-05
D-Link Dns-322l Firmware≤ 2026-02-05
D-Link Dns-323 Firmware≤ 2026-02-05
D-Link Dns-325 Firmware≤ 2026-02-05
D-Link Dns-326 Firmware≤ 2026-02-05
D-Link Dns-327l Firmware≤ 2026-02-05
D-Link Dns-340l Firmware≤ 2026-02-05
D-Link Dns-343 Firmware≤ 2026-02-05
D-Link Dns-345 Firmware≤ 2026-02-05
D-Link Dns-726-4 Firmware≤ 2026-02-05

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2026-4211 being actively exploited?

CVE-2026-4211 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 1.41%.

How severe is CVE-2026-4211?

CVE-2026-4211 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 1.41% probability of exploitation.

Which products are affected by CVE-2026-4211?

Affected products include D-Link Dnr-202l Firmware, D-Link Dnr-326 Firmware, D-Link Dns-1100-4 Firmware, D-Link Dns-1200-05 Firmware, D-Link Dns-120 Firmware, and 15 more.

How do I fix CVE-2026-4211?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-4211 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.