What’s Vulnerable › Vulnerabilities

CVE-2026-4194: D-Link DNS-1550-04 system_mgr.cgi cgi_set_wto access control

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-16 · updated 2026-06-17
• Weakness: CWE-266

Description

A vulnerability was detected 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_set_wto of the file /cgi-bin/system_mgr.cgi. Performing a manipulation results in improper access controls. Remote exploitation of the attack is possible. The exploit is now public and may be used.

Affected products

• Dlink Dnr-202L Firmware: through 2026-02-05
• Dlink Dnr-326 Firmware: through 2026-02-05
• Dlink Dns-1100-4 Firmware: through 2026-02-05
• Dlink Dns-1200-05 Firmware: through 2026-02-05
• Dlink Dns-120 Firmware: through 2026-02-05
• Dlink Dns-1550-04 Firmware: through 2026-02-05
• Dlink Dns-315L Firmware: through 2026-02-05
• D-Link DNS-320: through 2026-02-05
• Dlink Dns-320L Firmware: through 2026-02-05
• Dlink Dns-320Lw Firmware: through 2026-02-05
• Dlink Dns-321 Firmware: through 2026-02-05
• Dlink Dns-322L Firmware: through 2026-02-05
• Dlink Dns-323 Firmware: through 2026-02-05
• Dlink Dns-325 Firmware: through 2026-02-05
• Dlink Dns-326 Firmware: through 2026-02-05
• Dlink Dns-327L Firmware: through 2026-02-05
• Dlink Dns-340L Firmware: through 2026-02-05
• D-Link DNS-343 ShareCenter: through 2026-02-05
• Dlink Dns-345 Firmware: through 2026-02-05
• Dlink Dns-726-4 Firmware: through 2026-02-05

References

• https://github.com/wudipjq/my_vuln/blob/main/D-Link8/vuln_96/96.md
• https://vuldb.com/?ctiid.351106
• https://vuldb.com/?id.351106
• https://vuldb.com/?submit.769853
• https://www.dlink.com/

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