CVE-2023-40042
CVE-2023-40042 is a critical-severity vulnerability in Totolink T10 V2 Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.
Key facts
- Severity: Critical (CVSS 3.x base score 9.8)
- EPSS exploit prediction: 1% (68th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-787
- Affected product: Totolink T10 V2 Firmware
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2023-40042?
- 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.
- How severe is CVE-2023-40042?
- CVE-2023-40042 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2023-40042 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2023-40042?
- CVE-2023-40042 affects Totolink T10 V2 Firmware. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2023-40042?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2023-40042 published?
- CVE-2023-40042 was published on 2023-08-08 and last updated on 2026-06-17.
References
- http://www.totolink.cn
- https://github.com/Korey0sh1/IoT_vuln/blob/main/TOTOLINK/T10_V2/setStaticDhcpConfig.md
- https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/172/ids/36.html
Affected products (1)
- cpe:2.3:o:totolink:t10_v2_firmware:5.9c.5061_b20200511:*:*:*:*:*:*:*
More vulnerabilities in Totolink T10 V2 Firmware
- CVE-2023-40041 — Critical (CVSS 9.8): TOTOLINK T10_v2 5.9c.5061_B20200511 has a stack-based buffer overflow in setWiFiWpsConfig in /lib/cste_modules/wps.so.…
- CVE-2021-43636 — Critical (CVSS 9.8): Two Buffer Overflow vulnerabilities exists in T10 V2_Firmware V4.1.8cu.5207_B20210320 in the http_request_parse…
- CVE-2022-25081 — Critical (CVSS 9.8): TOTOLink T10 V5.9c.5061_B20200511 was discovered to contain a command injection vulnerability in the "Main" function.…
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