Description
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.
Published: 2026-09-14
Score: 9.4 Critical
EPSS: n/a
KEV: No
Impact: Remote stack-based buffer overflow allowing arbitrary code execution
Action: Immediate Patch
AI Analysis

Impact

A remote attack can manipulate PAddress, SubnetMask, or Gateway arguments of the HNAP1 SetStaticRouteSettings API, resulting in a stack-based buffer overflow in the strcpy function. The overflow may allow arbitrary code execution on the router.

Affected Systems

D-Link DIR-823G routers running firmware 1.0.2B05_20181207 are affected. The vulnerability exists in the HNAP1 component on the device.

Risk and Exploitability

The CVSS score of 9.4 indicates critical severity. EPSS data is not available, and the vulnerability is not listed in the CISA KEV catalog. The attack vector is remote, requiring network connectivity to the router’s management interface. Based on the description, it is inferred that no special privileges are required beyond remote access to the HNAP1 service.

Generated by OpenCVE AI on September 14, 2026 at 11:33 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Upgrade the router firmware to a version that includes the HNAP1 SetStaticRouteSettings fix.
  • If a firmware update is not yet available, restrict access to the router’s management interfaces (e.g., block port 80/443 from external networks).
  • Disable the HNAP1 service or block its RPC endpoints if possible to prevent the overflow exploitation.

Generated by OpenCVE AI on September 14, 2026 at 11:33 UTC.

Tracking

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Advisories

No advisories yet.

History

Mon, 14 Sep 2026 04:15:00 +0000

Type Values Removed Values Added
Description 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.
Title D-Link DIR-823G HNAP1 SetStaticRouteSettings strcpy stack-based overflow
First Time appeared D-link
D-link dir-823g
Weaknesses CWE-119
CWE-121
CPEs cpe:2.3:h:d-link:dir-823g:*:*:*:*:*:*:*:*
Vendors & Products D-link
D-link dir-823g
References
Metrics cvssV2_0

{'score': 9, 'vector': 'AV:N/AC:L/Au:S/C:C/I:C/A:C/E:ND/RL:ND/RC:UR'}

cvssV3_0

{'score': 9.9, 'vector': 'CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:X/RL:X/RC:R'}

cvssV3_1

{'score': 9.9, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:X/RL:X/RC:R'}

cvssV4_0

{'score': 9.4, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X'}

Subscriptions

D-link Dir-823g
cve-icon MITRE

Status: PUBLISHED

Assigner: VulDB

Published:

Updated: 2026-09-14T04:00:08.963Z

Reserved: 2026-09-13T04:47:27.543Z

Link: CVE-2026-90680

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-14T04:16:36.353

Modified: 2026-09-14T04:16:36.353

Link: CVE-2026-90680

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-14T11:45:17Z

Weaknesses
  • CWE-119

    Improper Restriction of Operations within the Bounds of a Memory Buffer

  • CWE-121

    Stack-based Buffer Overflow