CVE-2025-1103Public exploitNetwork attack vector

Authenticated router crash via malformed macList parameter

Published Feb 7, 2025 · Updated Feb 7, 2025

Null pointer dereference in D-Link DIR-823X firmware 240126 and 240802 allows remote authenticated users to crash the router. The set_wifi_blacklists handler at /goform/set_wifi_blacklists dereferences a null pointer while processing a crafted macList POST parameter. Low-privileged management access is required, and successful exploitation interrupts routing availability without reported data disclosure or modification.

CVSS severity7.1
High
EPSS probability14.07%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Null pointer dereference in D-Link DIR-823X firmware 240126 and 240802 allows remote authenticated users to crash the router. The set_wifi_blacklists handler at /goform/set_wifi_blacklists dereferences a null pointer while processing a crafted macList POST parameter. Low-privileged management access is required, and successful exploitation interrupts routing availability without reported data disclosure or modification.

The record

CVE
CVE-2025-1103
Published
Feb 7, 2025
Updated
Feb 7, 2025
Vendor
D-Link
Product
DIR-823X
Classifications
CWE-476, CWE-404, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 7, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 7, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=240126
  2. Affected versionversion=240802

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

D-Link · DIR-823Xversion=240126; version=240802

Published CVSS scores

6.5VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.8VulDBAV:N/AC:L/Au:S/C:N/I:N/A:C
7.1VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
CWE-404Improper Resource Shutdown or Release
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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