CVE-2026-77946 TRENDnet TEW-821DAP NTP Timezone Configuration apply_time.cgi uci_safe_get stack-based overflow
Remote attackers can trigger a stack-based buffer overflow in the NTP timezone configuration handler, potentially leading to arbitrary code execution on the device.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-77946?
CVE-2026-77946 is a critical memory corruption vulnerability in TRENDnet TEW-821DAP, published on 22 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability was determined in TRENDnet TEW-821DAP 2.2.01b05. Affected by this vulnerability is the function uci_safe_get of the file /cgi-bin/apply_time.cgi of the component NTP Timezone Configuration Handler. Executing a manipulation of the argument system.ntp.server/system.ntp.enable_server/cameo.time.time_zone/cameo.cameo.syslog_server can lead to stack-based buffer overflow. The attack may be launched remotely. The exploit has been publicly disclosed and may be utilized.
Which versions are affected by CVE-2026-77946?
How do I fix CVE-2026-77946?
No fix has been published for CVE-2026-77946 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-2026-77946 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-77946 exists.
Sources
Also known as GHSA-cvhx-h689-9gjx.