CVE-2026-90680

D-Link DIR-823G HNAP1 SetStaticRouteSettings strcpy stack-based overflow

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Published Sep 14, 2026 CVSS 4.0 · 9.4 Critical EPSS < 1% KEV · Not listed
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.

Analysis

AI-generated

Technical 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. The EPSS score of < 1% indicates a very low probability of exploitation, 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.

Remediation

No solution or workaround provided in the CVE record.

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 15, 2026 at 15:28 UTC.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}
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'}
Weaknesses
  • CWE-119

    Improper Restriction of Operations within the Bounds of a Memory Buffer

  • CWE-121

    Stack-based Buffer Overflow

Sources

Status
PUBLISHED
Assigner
VulDB
Published
Updated
Sep 16, 2026, 2:43 PM
Reserved
Sep 13, 2026, 4:47 AM

View source JSON

Updated
Sep 16, 2026, 2:43 PM

JSON

Status
Deferred
Published
Sep 14, 2026, 4:16 AM
Modified
Sep 16, 2026, 3:18 PM

View source JSON

No data.

Updated
Sep 15, 2026, 3:30 PM

JSON