TRENDnet TEW-821DAP 2.2.01b05 NTP Timezone Configuration /cgi-bin/apply_time.cgi uci_safe_get stack-based overflow

Summaryinfo

A vulnerability was found in TRENDnet TEW-821DAP 2.2.01b05. It has been classified as very critical. Affected by this issue is the function uci_safe_get of the file /cgi-bin/apply_time.cgi of the component NTP Timezone Configuration Handler. The manipulation of the argument system.ntp.server/system.ntp.enable_server/cameo.time.time_zone/cameo.cameo.syslog_server leads to stack-based overflow. This vulnerability is referenced as CVE-2026-77946. Remote exploitation of the attack is possible. Furthermore, an exploit is available.

Detailsinfo

A vulnerability, which was classified as very critical, has been found in TRENDnet TEW-821DAP 2.2.01b05. This issue affects the function uci_safe_get of the file /cgi-bin/apply_time.cgi of the component NTP Timezone Configuration Handler. The manipulation of the argument system.ntp.server/system.ntp.enable_server/cameo.time.time_zone/cameo.cameo.syslog_server with an unknown input leads to a stack-based overflow vulnerability. Using CWE to declare the problem leads to CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). Impacted is confidentiality, integrity, and availability.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-77946. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details as well as a public exploit are known. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/21/2026).

The exploit is available at github.com. It is declared as proof-of-concept.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• TRENDnet

Name

• TEW-821DAP

Version

• 2.2.01b05

License

• commercial

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

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Submitinfo

Accepted

• Submit #881252: TRENDnet TEW-821DAP Wireless Access Point v2.2.01b05 Stack-based Buffer Overflow (by ST4R0002)

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