How severe is CVE-2026-4204?

CVE-2026-4204 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2026-4204 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-4204?

CVE-2026-4204 primarily affects Dlink Dnr-202l Firmware. In total, 20 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-4204?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-4204 have an EU (EUVD) identifier?

Yes. CVE-2026-4204 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-12277.

When was CVE-2026-4204 published?

CVE-2026-4204 was published on 2026-03-16 and last updated on 2026-06-17.

CVE-2026-4204

CVE-2026-4204 is a medium-severity vulnerability in Dlink Dnr-202l Firmware with a CVSS 3.x base score of 6.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-77.

Key facts

Severity: Medium (CVSS 3.x base score 6.3)
CVSS v2: 6.5
CVSS v4: 2.1
EPSS exploit prediction: 3% (87th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-12277
Weakness: CWE-77
Affected product: Dlink Dnr-202l Firmware
Published: 2026-03-16
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-4204?: 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.
How severe is CVE-2026-4204?: CVE-2026-4204 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2026-4204 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-4204?: CVE-2026-4204 primarily affects Dlink Dnr-202l Firmware. In total, 20 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-4204?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-4204 have an EU (EUVD) identifier?: Yes. CVE-2026-4204 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-12277.
When was CVE-2026-4204 published?: CVE-2026-4204 was published on 2026-03-16 and last updated on 2026-06-17.

References

Affected products (20)

cpe:2.3:o:dlink:dnr-202l_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dnr-326_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dns-1100-4_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dns-120_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dns-1200-05_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dns-1550-04_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dns-315l_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dns-320_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dns-320l_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dns-320lw_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dns-321_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dns-322l_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dns-323_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dns-325_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dns-326_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dns-327l_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dns-340l_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dns-343_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dns-345_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dns-726-4_firmware:*:*:*:*:*:*:*:*

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