CVE-2023-40042

Name: CVE-2023-40042
Creator: NVD / NIST
Published: 2023-08-08T19:15:10.873+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.35%

Last modified Jun 17, 2026

CVE-2023-40042 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 1.35% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.35%

68.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Totolink	T10 V2 Firmware	5.9c.5061_b20200511

References

http://www.totolink.cnNot Applicable
https://github.com/Korey0sh1/IoT_vuln/blob/main/TOTOLINK/T10_V2/setStaticDhcpConfig.mdExploit, Third Party Advisory
https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/172/ids/36.htmlProduct
http://www.totolink.cnNot Applicable
https://github.com/Korey0sh1/IoT_vuln/blob/main/TOTOLINK/T10_V2/setStaticDhcpConfig.mdExploit, Third Party Advisory
https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/172/ids/36.htmlProduct

Timeline

Published: Aug 8, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-40042?

How severe is CVE-2023-40042?

CVE-2023-40042 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.35% probability of exploitation in the next 30 days.

How do I fix CVE-2023-40042?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-40042?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST