Is CVE-2023-43240 actively exploited?

No active exploitation of CVE-2023-43240 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2023-43240 be exploited remotely?

Yes. CVE-2023-43240 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2023-43240?

CVE-2023-43240 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2023-43240

CRITICAL

CVE-2023-43240

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 sip_address in ipportFilter.

NVD Source

Risk Analysis

A stack overflow vulnerability exists in the D-Link DIR-816 A2 router within the IP port filter configuration. This critical flaw could allow an unauthenticated remote attacker to compromise the device.

No public exploit is currently known, and the vulnerability is not in the CISA KEV. It is remotely exploitable with low attack complexity.

Recommended Action

Apply the latest firmware updates for the D-Link DIR-816 A2 to address this security gap.

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-2023-43240 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.