RCE in D-Link Dnr-202l
CVE-2026-4205
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. The impacted element is the function cgi_refresh_db/FTP_Server_BlockIP_Add/FTP_Server_BlockIP_Del of the file /cgi-bin/app_mgr.cgi. Such manipulation leads to command injection. The attack can be executed remotely. The exploit has been disclosed to the public and may be used.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.051 (92.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 92nd percentile — 92.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.038 · newest: 0.051 · change: +0.012
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
- vuldb.com/ (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- vuldb.com/ (signature, Permissions Required, permissions-required, VDB Entry)
- vuldb.com/ (VDB Entry, Third Party Advisory, third-party-advisory)
- vuldb.com/ (VDB Entry, Third Party Advisory, third-party-advisory)
- vuldb.com/ (VDB Entry, Third Party Advisory, third-party-advisory)
- github.com/wudipjq/my_vuln/blob/main/D-Link8/vuln_131/131.md (related, Exploit, Third Party Advisory)
- github.com/wudipjq/my_vuln/blob/main/D-Link8/vuln_132/132.md (Exploit, Third Party Advisory, exploit)
- www.dlink.com/ (Product, product)
Frequently asked questions
- What is CVE-2026-4205?
- CVE-2026-4205 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-2026-4205?
- Medium severity. CVSS v3 base score is 6.3 out of 10.