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CVE-2026-5212

D-Link Dnr-202l Firmware buffer overflow

8.8 HIGHPublic exploitEPSS 1.16%
  1. Published31 Mar 2026

Description

A vulnerability 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. This issue affects the function Webdav_Upload_File of the file /cgi-bin/webdav_mgr.cgi. The manipulation of the argument f_file leads to stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit has been disclosed to the public and may be used.

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-2026-5212 being actively exploited?

CVE-2026-5212 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 1.16%.

How severe is CVE-2026-5212?

CVE-2026-5212 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 1.16% probability of exploitation.

Which products are affected by CVE-2026-5212?

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-2026-5212?

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-2026-5212 against the real software inventory on every managed device, as each hourly inventory arrives. 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.