What is CVE-2026-90680?

CVE-2026-90680 is a critical-severity vulnerability in D-Link Dir-823g, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.9/10. Published 2026-09-14.

How severe is CVE-2026-90680?

Critical severity. CVSS v3 base score is 9.9 out of 10.

Buffer overflow in D-Link Dir-823g

CVE-2026-90680

A security flaw has been discovered in D-Link DIR-823G 1.0.2B05_20181207. The impacted element is the function strcpy of the file /HNAP1/SetStaticRouteSettings of the component HNAP1. The manipulation of the argument PAddress/SubnetMask/Gateway results in stack-based buffer overflow. The attack can be launched remotely.

Vulnerability class: Buffer Overflow

EPSS: 0.005 (42.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

Affected products

D-link Dir-823g — versions 1.0.2B05_20181207

Weakness classification (CWE)

References

cna@vuldb.com (related)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (technical-description, vdb-entry)
cna@vuldb.com (signature, permissions-required)
cna@vuldb.com (product)

Frequently asked questions

What is CVE-2026-90680?: CVE-2026-90680 is a critical-severity vulnerability in D-Link Dir-823g, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.9/10. Published 2026-09-14.
How severe is CVE-2026-90680?: Critical severity. CVSS v3 base score is 9.9 out of 10.