Buffer Overflow Vulnerability in TRENDnet TEW-821DAP NTP Configuration
CVE-2026-77946

10CRITICAL

Key Information:

Vendor

Trendnet

Status
Tew-821dap
Vendor
CVE Published:
22 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-77946?

A vulnerability exists in the TRENDnet TEW-821DAP product version 2.2.01b05, specifically within the uci_safe_get function of the /cgi-bin/apply_time.cgi script related to the NTP Timezone Configuration. An attacker can exploit this vulnerability by manipulating specific arguments, leading to a stack-based buffer overflow. This exploit can be launched remotely, making devices susceptible to the risk of unauthorized access and control.

Affected Version(s)

TEW-821DAP 2.2.01b05

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-77946 - Proof of Concept

References

https://vuldb.com/vuln/394175
vdb-entrytechnical-description
https://vuldb.com/vuln/394175/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-77946
third-party-advisory

CVSS V4

Score:
10
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

ST4R0002 (VulDB User)
.