CVE-2026-90693 D-Link DIR-878 - Buffer Overflow

D-Link DIR-878 120B05 contains a stack-based buffer overflow caused by manipulation of the Primary/Secondary argument in SetWan3Settings of WAN Settings, letting remote attackers execute arbitrary code, exploit requires network access.

CVSS base score 9.9 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.91% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Buffer Overflow
Impact
Remote Code Execution
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Published
14 September 2026
Updated
15 October 2026
Weakness
CWE-119

Vendor fix

Update to the latest firmware version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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