Is CVE-2023-40042 actively exploited?

No active exploitation of CVE-2023-40042 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2023-40042 be exploited remotely?

Yes. CVE-2023-40042 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2023-40042?

CVE-2023-40042 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2023-40042

CRITICAL

CVE-2023-40042

CWE-787Published: August 8, 2023· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

TOTOLINK T10_v2 5.9c.5061_B20200511 has a stack-based buffer overflow in setStaticDhcpConfig in /lib/cste_modules/lan.so. Attackers can send crafted data in an MQTT packet, via the comment parameter, to control the return address and execute code.

NVD Source

Risk Analysis

A stack-based buffer overflow exists in the TOTOLINK T10_v2 firmware due to improper handling of the comment parameter in MQTT packets. This critical flaw allows an attacker to execute arbitrary code, warranting a 9.8 CVSS score.

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 provided by the manufacturer to remediate the buffer overflow vulnerability.

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-2023-40042 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.