CVE-2023-44833Public exploitNetwork attack vector

Unauthenticated router crash via unchecked GuardInt

Published Oct 5, 2023 · Updated Sep 19, 2024

Buffer overflow in D-Link DIR-823G firmware 1.0.2B05 allows remote attackers to crash the router via a crafted GuardInt value. The SetWLanRadioSettings handler processes the untrusted GuardInt parameter without adequate bounds checking, overrunning a memory buffer. No authentication or user interaction is required, and the documented consequence is an availability-only service interruption rather than data disclosure or modification.

CVSS severity7.5
High
EPSS probability0.86%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in D-Link DIR-823G firmware 1.0.2B05 allows remote attackers to crash the router via a crafted GuardInt value. The SetWLanRadioSettings handler processes the untrusted GuardInt parameter without adequate bounds checking, overrunning a memory buffer. No authentication or user interaction is required, and the documented consequence is an availability-only service interruption rather than data disclosure or modification.

The record

CVE
CVE-2023-44833
Published
Oct 5, 2023
Updated
Sep 19, 2024
Vendor
D-Link
Product
DIR-823G
Classifications
CWE-120, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 5, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 19, 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=1.0.2b05

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

D-Link · DIR-823Gversion=1.0.2b05

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499.004Application or System Exploitation

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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