CVE-2026-2181 Tenda RX3 openSchedWifi stack-based overflow
Remote attackers can trigger a stack-based buffer overflow in the Tenda RX3 router via the openSchedWifi endpoint, potentially leading to code execution or service disruption.
- 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-2026-2181?
CVE-2026-2181 is a high-severity memory corruption vulnerability in Tenda RX3, published on 8 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A security flaw has been discovered in Tenda RX3 16.03.13.11. Affected by this vulnerability is an unknown functionality of the file /goform/openSchedWifi. Performing a manipulation of the argument schedStartTime/schedEndTime results in stack-based buffer overflow. The attack may be initiated remotely. The exploit has been released to the public and may be used for attacks.
Which versions are affected by CVE-2026-2181?
It affects 1 product.
Products include Tenda Rx3 Firmware.
How do I fix CVE-2026-2181?
No fix has been published for CVE-2026-2181 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-2026-2181 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2181 exists.
Other vulnerabilities in Tenda RX3
- CVE-2025-44899 Memory corruption in n/a
- CVE-2026-2180 Tenda RX3 fast_setting_wifi_set stack-based overflow
- CVE-2026-2185 Tenda RX3 MAC Filtering Configuration Endpoint setBlackRule set_device_name stack-based overflow
- CVE-2026-2186 Tenda RX3 SetIpMacBind fromSetIpMacBind stack-based overflow
- CVE-2026-2187 Tenda RX3 formSetQosBand set_qosMib_list stack-based overflow
Sources
Also known as GHSA-hcmw-7h84-qr3x.