Is CVE-2023-40899 actively exploited?

No active exploitation of CVE-2023-40899 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2023-40899 be exploited remotely?

Yes. CVE-2023-40899 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2023-40899?

CVE-2023-40899 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2023-40899

CRITICAL

CVE-2023-40899

CWE-787Published: August 24, 2023· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

Tenda AC8 v4 US_AC8V4.0si_V16.03.34.06_cn was discovered to contain a stack overflow via parameter macFilterType and parameter deviceList at /goform/setMacFilterCfg.

NVD Source

Risk Analysis

A stack overflow vulnerability exists in the Tenda AC8 firmware due to improper processing of the macFilterType and deviceList parameters. This critical flaw carries a 9.8 CVSS score and allows unauthenticated attackers to potentially execute arbitrary code.

No public exploit is known for this issue, and it is not in the CISA KEV database. The vulnerability is remotely exploitable with low attack complexity.

Recommended Action

Apply the latest firmware updates provided by Tenda for the AC8 v4. Restrict access to the router's web management interface to trusted internal networks only.

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-2023-40899 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.