CVE-2024-33345Public exploitNetwork attack vector

Router crash via null firmware filename

Published Apr 29, 2024 · Updated Aug 2, 2024

A null-pointer dereference in upload_firmware.cgi in D-Link DIR-823G A1V1.0.2B05 allows remote attackers to crash the router. Its file-validation helper returns null when the attacker-controlled UPLOAD_FILENAME cannot be opened, and main passes that null value to strncmp. The proof of concept describes an authorized attacker, while CISA rates exploitation as requiring user interaction but no privileges.

CVSS severity6.5
Medium
EPSS probability0.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A null-pointer dereference in upload_firmware.cgi in D-Link DIR-823G A1V1.0.2B05 allows remote attackers to crash the router. Its file-validation helper returns null when the attacker-controlled UPLOAD_FILENAME cannot be opened, and main passes that null value to strncmp. The proof of concept describes an authorized attacker, while CISA rates exploitation as requiring user interaction but no privileges.

The record

CVE
CVE-2024-33345
Published
Apr 29, 2024
Updated
Aug 2, 2024
Vendor
D-Link
Product
DIR-823G
Classifications
CWE-476, T1499
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Apr 29, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=a1v1.0.2b05

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

D-Link · DIR-823Gversion=a1v1.0.2b05

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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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