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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.009 (59.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 60th percentile — 59.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
- D-Link Dir-823g — versions 1.0.2B05_20181207
Weakness classification (CWE)
References
- github.com/Amalll-Sec/router-vulnerability-research/blob/main/advisories/d-link… (related)
- vuldb.com/cve/CVE-2026-90680 (third-party-advisory)
- vuldb.com/submit/914902 (third-party-advisory)
- vuldb.com/vuln/403213 (technical-description, vdb-entry)
- vuldb.com/vuln/403213/cti (signature, permissions-required)
- www.dlink.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.