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CVE-2026-77946— TRENDnet TEW-821DAP NTP Timezone Configuration apply_time.cgi uci_safe_get stack-based overflow

Quick assessment

Affected
TRENDnet TEW-821DAP
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 TRENDnet TEW-821DAP 设备版本 2.2.01b05 中发现了一个漏洞。受该漏洞影响的是组件“NTP 时区配置处理器”（NTP Timezone Configuration Handler）中文件 /cgi-bin/apply_time.cgi 的 uci_safe_get 函数。通过操纵参数 system.ntp.server、system.ntp.enable_server、cameo.time.time_zone 或 cameo.cameo.syslog_server，可导致基于栈的缓冲区

CVSS 10.0 · Critical EPSS 0.62% · P47

Affected Version Matrix 1

VendorProduct Version RangeStatus
TRENDnet TEW-821DAP 2.2.01b05 affected
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I. Basic Information for CVE-2026-77946

Vulnerability Information
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Vulnerability Title
TRENDnet TEW-821DAP NTP Timezone Configuration apply_time.cgi uci_safe_get stack-based overflow
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
TRENDnet TEW-821DAP 2.2.01b05 cpe:2.3:o:trendnet:tew-821dap_firmware:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-77946

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9220 chars
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III. Intelligence Information for CVE-2026-77946

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Vendor Advisories for CVE-2026-77946 (2)

Proof of Concept for CVE-2026-77946 (1)

Other References for CVE-2026-77946 (1)

Same Patch Batch · TRENDnet · 2026-08-22 · 3 CVEs total

CVE-2026-77945 7.4 HIGH TRENDnet TEW-821DAP ssi upload.cgi command injection
CVE-2026-77988 6.6 MEDIUM TRENDnet TEW-823DRU CLI Configuration Tool nvram_get command injection

IV. Related Vulnerabilities

Same product: TEW-821DAP
Same vendor: TRENDnet
Same weakness: CWE-121

V. Comments for CVE-2026-77946

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