CVE-2025-3820 Tenda W12/i24 httpd cgiSysUplinkCheckSet stack-based overflow
Remote attackers can trigger a stack-based buffer overflow in Tenda W12/i24 routers via the httpd service, potentially leading to arbitrary code execution.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-3820?
CVE-2025-3820 is a high-severity memory corruption vulnerability in Tenda W12, published on 19 Apr 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability was found in Tenda W12 and i24 3.0.0.4(2887)/3.0.0.5(3644) and classified as critical. Affected by this issue is the function cgiSysUplinkCheckSet of the file /bin/httpd. The manipulation of the argument hostIp1/hostIp2 leads to stack-based buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used.
Which versions are affected by CVE-2025-3820?
It affects 2 products.
Products include Tenda I24 Firmware, Tenda W12 Firmware.
How do I fix CVE-2025-3820?
No fix has been published for CVE-2025-3820 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-3820 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-3820 exists.
Other vulnerabilities in Tenda W12
- CVE-2024-57483 Memory corruption in n/a
- CVE-2025-4007 Tenda W12/i24 httpd modules cgidhcpsCfgSet stack-based overflow
- CVE-2025-3802 Tenda W12/i24 httpd cgiPingSet stack-based overflow
- CVE-2025-3803 Tenda W12/i24 httpd cgiSysScheduleRebootSet stack-based overflow
- CVE-2025-70798 Hardcoded credentials in n/a
Sources
Also known as GHSA-f9cw-7mcv-gq63.