CVE-2023-39669Network attack vector

Unauthenticated service interruption via NULL pointer dereference

Published Aug 18, 2023 · Updated Oct 7, 2024

NULL pointer dereference in D-Link DIR-880L A1 firmware 1.07WWb08 allows remote attackers to interrupt the router service. The undocumented FUN_00010824 function dereferences a NULL pointer, but the published record does not identify the request or input that supplies the invalid value. Network access is sufficient without authentication or user interaction; the documented consequence is an availability-only service interruption.

CVSS severity7.5
High
EPSS probability1.28%
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-880L A1 firmware 1.07WWb08 allows remote attackers to interrupt the router service. The undocumented FUN_00010824 function dereferences a NULL pointer, but the published record does not identify the request or input that supplies the invalid value. Network access is sufficient without authentication or user interaction; the documented consequence is an availability-only service interruption.

The record

CVE
CVE-2023-39669
Published
Aug 18, 2023
Updated
Oct 7, 2024
Vendor
D-Link
Product
DIR-880L
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 18, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 7, 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=a1_fw107wwb08

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

D-Link · DIR-880Lversion=a1_fw107wwb08

Published CVSS scores

7.5NVDCVSS: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 exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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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