CVE-2026-4205D-Link DNS-1550-04 app_mgr.cgi FTP_Server_BlockIP_Del command injection

5.3MediumCVSS base score
4.5%Exploitation in 30 daysEPSS · top 8.3% of all CVEs
NoKnown exploitednot in CISA's KEV catalog
YesPublic exploitsa reference or SSVC says so

Description

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.

Public exploit

An exploit or proof of concept is public: anyone can try it against an unpatched system. A reference of the record is tagged as an exploit. CISA's SSVC rates its exploitation: a proof of concept is public.

Show the exploits1

References tagged exploit1 reference

https://github.com/wudipjq/my_vuln/blob/main/D-Link8/vuln_132/132.md (opens in a new tab)exploit

Timeline

2026
15 Mar 2026
15 Mar 2026
ID reserved
By VulDB
16 Mar 20261 day later
16 Mar 2026· 1 day later
Published

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-4205, by who scored it
Scored by	CVSS	Score	Vector
VulDBCNA (assigner)	4.0	Medium5.3	CVSS: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
VulDBCNA (assigner)	3.1	Medium6.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
VulDBCNA (assigner)	3.0	Medium6.3	CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
VulDBCNA (assigner)	2.0	Medium6.5	AV:N/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:ND/RC:UR
NVDNVD · Analyzed	4.0	Low2.1	CVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS (exploitation in 30 days): 4.5% · top 8.3% of all CVEs (12 Nov 2026)
CISA SSVC: Exploitation: poc · Automatable: no · Technical impact: total

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.

Affected products

D-Link · DNS-120
- affected 20260205
D-Link · DNR-202L
- affected 20260205
D-Link · DNS-315L
- affected 20260205
D-Link · DNS-320
- affected 20260205
D-Link · DNS-320L
- affected 20260205
D-Link · DNS-320LW
- affected 20260205
D-Link · DNS-321
- affected 20260205
D-Link · DNR-322L
- affected 20260205
D-Link · DNS-323
- affected 20260205
D-Link · DNS-325
- affected 20260205
D-Link · DNS-326
- affected 20260205
D-Link · DNS-327L
- affected 20260205
D-Link · DNR-326
- affected 20260205
D-Link · DNS-340L
- affected 20260205
D-Link · DNS-343
- affected 20260205
D-Link · DNS-345
- affected 20260205
D-Link · DNS-726-4
- affected 20260205
D-Link · DNS-1100-4
- affected 20260205
D-Link · DNS-1200-05
- affected 20260205
D-Link · DNS-1550-04
- affected 20260205

References8

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

[![CVE-2026-4205](https://cveledger.app/badge/CVE-2026-4205.svg)](https://cveledger.app/cve/CVE-2026-4205)

Record last updated 16 Mar 2026, 14:40 UTC.