Is CVE-2023-43239 actively exploited?

No active exploitation of CVE-2023-43239 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2023-43239 be exploited remotely?

Yes. CVE-2023-43239 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2023-43239?

CVE-2023-43239 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2023-43239

CRITICAL

CVE-2023-43239

CWE-787Published: September 21, 2023· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

D-Link DIR-816 A2 v1.10CNB05 was discovered to contain a stack overflow via parameter flag_5G in showMACfilterMAC.

NVD Source

Risk Analysis

The D-Link DIR-816 A2 contains a stack overflow vulnerability in its MAC filtering functionality. This critical flaw allows for remote exploitation, potentially leading to full device compromise.

There is no public exploit information available, and it is not included in the CISA KEV. The vulnerability is remotely exploitable.

Recommended Action

Update the D-Link DIR-816 A2 firmware to the latest available version.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2023-43239 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

From a weakness classification perspective (CWE-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.