What is CVE-2026-4209?

CVE-2026-4209 is a medium-severity vulnerability in D-Link Dnr-202l, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.3/10. Published 2026-03-16.

How severe is CVE-2026-4209?

Medium severity. CVSS v3 base score is 6.3 out of 10.

RCE in D-Link Dnr-202l

CVE-2026-4209

A vulnerability was 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 is the function cgi_create_import_users/cgi_user_batch_create/cgi_user_set_quota/cgi_user_del/cgi_user_modify/cgi_group_set_quota/cgi_group_modify/cgi_group_add/cgi_user_add/cgi_get_modify_group_info/cgi_chg_admin_pw of the file /cgi-bin/account_mgr.cgi. The manipulation leads to command injection. It is possible to initiate the attack remotely. The exploit is publicly available and might be used.

EPSS: 0.045 (90.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.

Affected products

D-link Dnr-202l — versions 20260205
D-link Dnr-322l — versions 20260205
D-link Dnr-326 — versions 20260205
D-link Dns-1100-4 — versions 20260205
D-link Dns-120 — versions 20260205
D-link Dns-1200-05 — versions 20260205
D-link Dns-1550-04 — versions 20260205
D-link Dns-315l — versions 20260205
D-link Dns-320 — versions 20260205
D-link Dns-320l — versions 20260205

Weakness classification (CWE)

References

cna@vuldb.com (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
cna@vuldb.com (signature, Permissions Required, permissions-required, VDB Entry)
cna@vuldb.com (VDB Entry, Third Party Advisory, third-party-advisory)
cna@vuldb.com (VDB Entry, Third Party Advisory, third-party-advisory)
cna@vuldb.com (VDB Entry, Third Party Advisory, third-party-advisory)
cna@vuldb.com (VDB Entry, Third Party Advisory, third-party-advisory)
cna@vuldb.com (VDB Entry, Third Party Advisory, third-party-advisory)
cna@vuldb.com (VDB Entry, Third Party Advisory, third-party-advisory)
cna@vuldb.com (VDB Entry, Third Party Advisory, third-party-advisory)
cna@vuldb.com (VDB Entry, Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2026-4209?: CVE-2026-4209 is a medium-severity vulnerability in D-Link Dnr-202l, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.3/10. Published 2026-03-16.
How severe is CVE-2026-4209?: Medium severity. CVSS v3 base score is 6.3 out of 10.