CVE-2026-4206Public exploitNetwork attack vector

Remote command execution via unsanitized disk parameters

Published Mar 16, 2026 · Updated Mar 16, 2026

OS command injection in D-Link NAS and NVR firmware 20260205 and earlier allows remote attackers to execute commands via dsk_mgr.cgi. FMT_create_diskmgr passes attacker-controlled f_filesystem and f_sethdsize values into an OS command without neutralizing shell syntax. The public PoC reports no authentication, while the CNA's CVSS assessments require low privileges; successful exploitation grants shell access.

CVSS severity9.8
Critical
EPSS probability3.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in D-Link NAS and NVR firmware 20260205 and earlier allows remote attackers to execute commands via dsk_mgr.cgi. FMT_create_diskmgr passes attacker-controlled f_filesystem and f_sethdsize values into an OS command without neutralizing shell syntax. The public PoC reports no authentication, while the CNA's CVSS assessments require low privileges; successful exploitation grants shell access.

The record

CVE
CVE-2026-4206
Published
Mar 16, 2026
Updated
Mar 16, 2026
Vendor
D-Link
Product
DNR-322L
Classifications
CWE-77, CWE-74, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=20260205

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

D-Link · DNR-322Lversion=20260205
D-Link · DNS-325version=20260205
D-Link · DNS-726-4version=20260205
D-Link · DNS-320Lversion=20260205
D-Link · DNR-202Lversion=20260205
D-Link · DNS-340Lversion=20260205
D-Link · DNS-321version=20260205
D-Link · DNS-1550-04version=20260205
D-Link · DNS-343version=20260205
D-Link · DNS-315Lversion=20260205
D-Link · DNS-323version=20260205
D-Link · DNS-345version=20260205
D-Link · DNR-326version=20260205
D-Link · DNS-327Lversion=20260205
D-Link · DNS-326version=20260205
D-Link · DNS-120version=20260205
D-Link · DNS-320version=20260205
D-Link · DNS-1200-05version=20260205
D-Link · DNS-320LWversion=20260205

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
2.1VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
6.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
6.5VulDBAV:N/AC:L/Au:S/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
T1059.004Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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