9.8
CRITICAL CVSS 3.1
CVE-2026-4209
D-Link DNS-1550-04 account_mgr.cgi cgi_chg_admin_pw command injection
Description

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.

INFO

Published Date :

March 16, 2026, 2:20 p.m.

Last Modified :

March 19, 2026, 2:27 p.m.

Remotely Exploit :

Yes !
Affected Products

The following products are affected by CVE-2026-4209 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Dlink dns-320_firmware
2 Dlink dnr-322l_firmware
3 Dlink dns-320l_firmware
4 Dlink dns-320l
5 Dlink dns-120_firmware
6 Dlink dns-120
7 Dlink dnr-202l_firmware
8 Dlink dnr-202l
9 Dlink dns-315l_firmware
10 Dlink dns-315l
11 Dlink dns-320
12 Dlink dns-320lw_firmware
13 Dlink dns-320lw
14 Dlink dns-321_firmware
15 Dlink dns-321
16 Dlink dns-323_firmware
17 Dlink dns-323
18 Dlink dns-325_firmware
19 Dlink dns-325
20 Dlink dns-326_firmware
21 Dlink dns-326
22 Dlink dns-327l_firmware
23 Dlink dns-327l
24 Dlink dnr-326_firmware
25 Dlink dnr-326
26 Dlink dns-340l_firmware
27 Dlink dns-340l
28 Dlink dns-343_firmware
29 Dlink dns-343
30 Dlink dns-345_firmware
31 Dlink dns-345
32 Dlink dns-726-4_firmware
33 Dlink dns-726-4
34 Dlink dns-1100-4_firmware
35 Dlink dns-1100-4
36 Dlink dns-1200-05_firmware
37 Dlink dns-1200-05
38 Dlink dns-1550-04_firmware
39 Dlink dns-1550-04
40 Dlink dns-322l
41 Dlink dns-322l_firmware
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 2.0 MEDIUM [email protected]
CVSS 3.1 MEDIUM [email protected]
CVSS 3.1 CRITICAL [email protected]
CVSS 4.0 MEDIUM [email protected]
Solution
Update firmware to patch command injection vulnerability in account management CGI scripts.
  • Update firmware on affected devices.
  • Apply vendor patches when available.
  • Review account management configurations.
  • Restrict remote access to management interfaces.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-4209.

URL Resource
https://github.com/wudipjq/my_vuln/blob/main/D-Link8/vuln_148/148.md Exploit Third Party Advisory
https://github.com/wudipjq/my_vuln/blob/main/D-Link8/vuln_149/149.md Exploit Third Party Advisory
https://vuldb.com/?ctiid.351120 Permissions Required VDB Entry
https://vuldb.com/?id.351120 Third Party Advisory VDB Entry
https://vuldb.com/?submit.770429 Third Party Advisory VDB Entry
https://vuldb.com/?submit.770430 Third Party Advisory VDB Entry
https://vuldb.com/?submit.770431 Third Party Advisory VDB Entry
https://vuldb.com/?submit.770432 Third Party Advisory VDB Entry
https://vuldb.com/?submit.770433 Third Party Advisory VDB Entry
https://vuldb.com/?submit.770434 Third Party Advisory VDB Entry
https://vuldb.com/?submit.770435 Third Party Advisory VDB Entry
https://vuldb.com/?submit.770436 Third Party Advisory VDB Entry
https://vuldb.com/?submit.770437 Third Party Advisory VDB Entry
https://vuldb.com/?submit.770438 Third Party Advisory VDB Entry
https://www.dlink.com/ Product
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-4209 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-4209 weaknesses.

CAPEC-3: Using Leading 'Ghost' Character Sequences to Bypass Input Filters Using Leading 'Ghost' Character Sequences to Bypass Input Filters CAPEC-6: Argument Injection Argument Injection CAPEC-7: Blind SQL Injection Blind SQL Injection CAPEC-8: Buffer Overflow in an API Call Buffer Overflow in an API Call CAPEC-9: Buffer Overflow in Local Command-Line Utilities Buffer Overflow in Local Command-Line Utilities CAPEC-10: Buffer Overflow via Environment Variables Buffer Overflow via Environment Variables CAPEC-13: Subverting Environment Variable Values Subverting Environment Variable Values CAPEC-14: Client-side Injection-induced Buffer Overflow Client-side Injection-induced Buffer Overflow CAPEC-24: Filter Failure through Buffer Overflow Filter Failure through Buffer Overflow CAPEC-28: Fuzzing Fuzzing CAPEC-34: HTTP Response Splitting HTTP Response Splitting CAPEC-42: MIME Conversion MIME Conversion CAPEC-43: Exploiting Multiple Input Interpretation Layers Exploiting Multiple Input Interpretation Layers CAPEC-45: Buffer Overflow via Symbolic Links Buffer Overflow via Symbolic Links CAPEC-46: Overflow Variables and Tags Overflow Variables and Tags CAPEC-47: Buffer Overflow via Parameter Expansion Buffer Overflow via Parameter Expansion CAPEC-51: Poison Web Service Registry Poison Web Service Registry CAPEC-52: Embedding NULL Bytes Embedding NULL Bytes CAPEC-53: Postfix, Null Terminate, and Backslash Postfix, Null Terminate, and Backslash CAPEC-64: Using Slashes and URL Encoding Combined to Bypass Validation Logic Using Slashes and URL Encoding Combined to Bypass Validation Logic CAPEC-67: String Format Overflow in syslog() String Format Overflow in syslog() CAPEC-71: Using Unicode Encoding to Bypass Validation Logic Using Unicode Encoding to Bypass Validation Logic CAPEC-72: URL Encoding URL Encoding CAPEC-76: Manipulating Web Input to File System Calls Manipulating Web Input to File System Calls CAPEC-78: Using Escaped Slashes in Alternate Encoding Using Escaped Slashes in Alternate Encoding CAPEC-79: Using Slashes in Alternate Encoding Using Slashes in Alternate Encoding CAPEC-80: Using UTF-8 Encoding to Bypass Validation Logic Using UTF-8 Encoding to Bypass Validation Logic CAPEC-83: XPath Injection XPath Injection CAPEC-84: XQuery Injection XQuery Injection CAPEC-101: Server Side Include (SSI) Injection Server Side Include (SSI) Injection CAPEC-105: HTTP Request Splitting HTTP Request Splitting CAPEC-108: Command Line Execution through SQL Injection Command Line Execution through SQL Injection CAPEC-120: Double Encoding Double Encoding CAPEC-135: Format String Injection Format String Injection CAPEC-250: XML Injection XML Injection CAPEC-267: Leverage Alternate Encoding Leverage Alternate Encoding CAPEC-273: HTTP Response Smuggling HTTP Response Smuggling CAPEC-15: Command Delimiters Command Delimiters CAPEC-40: Manipulating Writeable Terminal Devices Manipulating Writeable Terminal Devices CAPEC-43: Exploiting Multiple Input Interpretation Layers Exploiting Multiple Input Interpretation Layers CAPEC-75: Manipulating Writeable Configuration Files Manipulating Writeable Configuration Files CAPEC-76: Manipulating Web Input to File System Calls Manipulating Web Input to File System Calls CAPEC-136: LDAP Injection LDAP Injection CAPEC-183: IMAP/SMTP Command Injection IMAP/SMTP Command Injection CAPEC-248: Command Injection Command Injection

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-4209 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2026-4209 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Mar. 19, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Added CWE CWE-77
    Added CPE Configuration AND OR *cpe:2.3:o:dlink:dnr-202l_firmware:*:*:*:*:*:*:*:* versions up to (including) 2026-02-05 OR cpe:2.3:h:dlink:dnr-202l:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dlink:dnr-326_firmware:*:*:*:*:*:*:*:* versions up to (including) 2026-02-05 OR cpe:2.3:h:dlink:dnr-326:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dlink:dns-1100-4_firmware:*:*:*:*:*:*:*:* versions up to (including) 2026-02-05 OR cpe:2.3:h:dlink:dns-1100-4:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dlink:dns-120_firmware:*:*:*:*:*:*:*:* versions up to (including) 2026-02-05 OR cpe:2.3:h:dlink:dns-120:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dlink:dns-1200-05_firmware:*:*:*:*:*:*:*:* versions up to (including) 2026-02-05 OR cpe:2.3:h:dlink:dns-1200-05:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dlink:dns-1550-04_firmware:*:*:*:*:*:*:*:* versions up to (including) 2026-02-05 OR cpe:2.3:h:dlink:dns-1550-04:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dlink:dns-315l_firmware:*:*:*:*:*:*:*:* versions up to (including) 2026-02-05 OR cpe:2.3:h:dlink:dns-315l:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dlink:dns-320_firmware:*:*:*:*:*:*:*:* versions up to (including) 2026-02-05 OR cpe:2.3:h:dlink:dns-320:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dlink:dns-320l_firmware:*:*:*:*:*:*:*:* versions up to (including) 2026-02-05 OR cpe:2.3:h:dlink:dns-320l:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dlink:dns-320lw_firmware:*:*:*:*:*:*:*:* versions up to (including) 2026-02-05 OR cpe:2.3:h:dlink:dns-320lw:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dlink:dns-321_firmware:*:*:*:*:*:*:*:* versions up to (including) 2026-02-05 OR cpe:2.3:h:dlink:dns-321:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dlink:dns-322l_firmware:*:*:*:*:*:*:*:* versions up to (including) 2026-02-05 OR cpe:2.3:h:dlink:dns-322l:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dlink:dns-323_firmware:*:*:*:*:*:*:*:* versions up to (including) 2026-02-05 OR cpe:2.3:h:dlink:dns-323:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dlink:dns-325_firmware:*:*:*:*:*:*:*:* versions up to (including) 2026-02-05 OR cpe:2.3:h:dlink:dns-325:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dlink:dns-326_firmware:*:*:*:*:*:*:*:* versions up to (including) 2026-02-05 OR cpe:2.3:h:dlink:dns-326:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dlink:dns-327l_firmware:*:*:*:*:*:*:*:* versions up to (including) 2026-02-05 OR cpe:2.3:h:dlink:dns-327l:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dlink:dns-340l_firmware:*:*:*:*:*:*:*:* versions up to (including) 2026-02-05 OR cpe:2.3:h:dlink:dns-340l:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dlink:dns-343_firmware:*:*:*:*:*:*:*:* versions up to (including) 2026-02-05 OR cpe:2.3:h:dlink:dns-343:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dlink:dns-345_firmware:*:*:*:*:*:*:*:* versions up to (including) 2026-02-05 OR cpe:2.3:h:dlink:dns-345:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dlink:dns-726-4_firmware:*:*:*:*:*:*:*:* versions up to (including) 2026-02-05 OR cpe:2.3:h:dlink:dns-726-4:-:*:*:*:*:*:*:*
    Added Reference Type VulDB: https://github.com/wudipjq/my_vuln/blob/main/D-Link8/vuln_148/148.md Types: Exploit, Third Party Advisory
    Added Reference Type VulDB: https://github.com/wudipjq/my_vuln/blob/main/D-Link8/vuln_149/149.md Types: Exploit, Third Party Advisory
    Added Reference Type VulDB: https://vuldb.com/?ctiid.351120 Types: Permissions Required, VDB Entry
    Added Reference Type VulDB: https://vuldb.com/?id.351120 Types: Third Party Advisory, VDB Entry
    Added Reference Type VulDB: https://vuldb.com/?submit.770429 Types: Third Party Advisory, VDB Entry
    Added Reference Type VulDB: https://vuldb.com/?submit.770430 Types: Third Party Advisory, VDB Entry
    Added Reference Type VulDB: https://vuldb.com/?submit.770431 Types: Third Party Advisory, VDB Entry
    Added Reference Type VulDB: https://vuldb.com/?submit.770432 Types: Third Party Advisory, VDB Entry
    Added Reference Type VulDB: https://vuldb.com/?submit.770433 Types: Third Party Advisory, VDB Entry
    Added Reference Type VulDB: https://vuldb.com/?submit.770434 Types: Third Party Advisory, VDB Entry
    Added Reference Type VulDB: https://vuldb.com/?submit.770435 Types: Third Party Advisory, VDB Entry
    Added Reference Type VulDB: https://vuldb.com/?submit.770436 Types: Third Party Advisory, VDB Entry
    Added Reference Type VulDB: https://vuldb.com/?submit.770437 Types: Third Party Advisory, VDB Entry
    Added Reference Type VulDB: https://vuldb.com/?submit.770438 Types: Third Party Advisory, VDB Entry
    Added Reference Type VulDB: https://www.dlink.com/ Types: Product
  • New CVE Received by [email protected]

    Mar. 16, 2026

    Action Type Old Value New Value
    Added Description 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.
    Added CVSS V4.0 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
    Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
    Added CVSS V2 (AV:N/AC:L/Au:S/C:P/I:P/A:P)
    Added CWE CWE-77
    Added CWE CWE-74
    Added Reference https://github.com/wudipjq/my_vuln/blob/main/D-Link8/vuln_148/148.md
    Added Reference https://github.com/wudipjq/my_vuln/blob/main/D-Link8/vuln_149/149.md
    Added Reference https://vuldb.com/?ctiid.351120
    Added Reference https://vuldb.com/?id.351120
    Added Reference https://vuldb.com/?submit.770429
    Added Reference https://vuldb.com/?submit.770430
    Added Reference https://vuldb.com/?submit.770431
    Added Reference https://vuldb.com/?submit.770432
    Added Reference https://vuldb.com/?submit.770433
    Added Reference https://vuldb.com/?submit.770434
    Added Reference https://vuldb.com/?submit.770435
    Added Reference https://vuldb.com/?submit.770436
    Added Reference https://vuldb.com/?submit.770437
    Added Reference https://vuldb.com/?submit.770438
    Added Reference https://www.dlink.com/
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.