CVE-2023-43235Public exploitNetwork attack vector

Unauthenticated code execution via HNAP parameter overflow

Published Sep 21, 2023 · Updated Sep 25, 2024

Stack overflow in D-Link DIR-823G 1.0.2B05 allows remote attackers to execute code or crash the web service via crafted HNAP requests. The goahead handler for SetWifiDownSettings uses the attacker-controlled StartTime and EndTime string length as the copy limit rather than the destination buffer capacity. An unauthenticated HTTP request to the HNAP1 endpoint is sufficient; demonstrated input crashes goahead, while carefully crafted overflow data permits code execution.

CVSS severity9.8
Critical
EPSS probability1.04%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack overflow in D-Link DIR-823G 1.0.2B05 allows remote attackers to execute code or crash the web service via crafted HNAP requests. The goahead handler for SetWifiDownSettings uses the attacker-controlled StartTime and EndTime string length as the copy limit rather than the destination buffer capacity. An unauthenticated HTTP request to the HNAP1 endpoint is sufficient; demonstrated input crashes goahead, while carefully crafted overflow data permits code execution.

The record

CVE
CVE-2023-43235
Published
Sep 21, 2023
Updated
Sep 25, 2024
Vendor
D-Link
Product
DIR-823G
Classifications
CWE-787, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 21, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=v1.0b05

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

D-Link · DIR-823Gversion=v1.0b05

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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