Is CVE-2026-4204 actively exploited?

No active exploitation of CVE-2026-4204 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-4204 be exploited remotely?

Yes. CVE-2026-4204 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-4204?

CVE-2026-4204 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2026-4204

CWE-74Published: March 16, 2026· Updated: Jun 17, 2026

9.8

CVSS v3.1

EPSS:0.63%probability of exploitation in 30 daysPercentile:69.9th

Official Description

A flaw 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. The affected element is the function cgi_myfavorite_add/cgi_myfavorite_set/cgi_myfavorite_del/cgi_myfavorite_set_sort_info/cgi_myfavorite_remove_apkg/cgi_myfavorite_compare_apkg/cgi_mycloud_auto_downlaod of the file /cgi-bin/gui_mgr.cgi. This manipulation of the argument f_user causes command injection. Remote exploitation of the attack is possible. The exploit has been published and may be used.

NVD Source

Risk Analysis

This critical vulnerability allows an unauthenticated attacker to execute arbitrary commands on D-Link devices by injecting commands into functions related to GUI and user favorites management. With a CVSS score of 9.8, this flaw poses a severe risk, potentially leading to full system compromise. The absence of an EPSS score means its exploitation likelihood is not currently assessed by that metric, but the critical CVSS score emphasizes its urgency.

No public exploit is currently known for this vulnerability. The attack is remotely exploitable with low complexity, meaning an attacker can exploit it without requiring local access or specific conditions.

Recommended Action

To address this command injection vulnerability, update D-Link DNR-202L, DNR-326, and DNS-1100-4 devices to the latest available firmware. If updates are not available, consider isolating or removing affected devices from the network.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2026-4204 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

dlink40 product(s)

dnr-202l firmwarednr-202ldnr-326 firmwarednr-326dns-1100-4 firmwaredns-1100-4dns-120 firmwaredns-120dns-1200-05 firmwaredns-1200-05dns-1550-04 firmwaredns-1550-04+28

Source: NVD CPE · 40 total CPE entries