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Vulnerability record · CVE-2021-20158 · published 30 December 2021

CVE-2021-20158: Trendnet tew-827dru firmware missing authentication for critical function vulnerability

Trendnet · Tew 827dru Firmware

Trendnet AC2600 TEW-827DRU version 2.08B01 contains an authentication bypass vulnerability. It is possible for an unauthenticated, malicous actor to force the change of the admin password due to a hidden administrative command.

9.8 CVSS 3.1 Critical EPSS 11% · top 4.3% CWE-306 · Missing authentication for critical function
9.8CVSS 3.1 base score, v2 7.5
11%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

Trendnet AC2600 TEW-827DRU version 2.08B01 contains an authentication bypass vulnerability. It is possible for an unauthenticated, malicous actor to force the change of the admin password due to a hidden administrative command.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.tenable.com/security/research/tra-2021-54 Third Party Advisory
https://www.tenable.com/security/research/tra-2021-54 Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2024-28354Trendnet tew-827dru firmware command injection vulnerabilityThere is a command injection vulnerability in the TRENDnet TEW-827DRU router with firmware version 2.10B01. An attacker can inject commands into the …EPSS 2.2%10.0CVE-2021-20151Trendnet tew-827dru firmware vulnerabilityTrendnet AC2600 TEW-827DRU version 2.08B01 contains a flaw in the session management for the device. The router's management software manages web ses…EPSS 1.6%9.8CVE-2021-20149Trendnet tew-827dru firmware incorrect authorization vulnerabilityTrendnet AC2600 TEW-827DRU version 2.08B01 does not have sufficient access controls for the WAN interface. The default iptables ruleset for governing…EPSS 1.4%9.8CVE-2021-20155Trendnet tew-827dru firmware hard-coded credentials vulnerabilityTrendnet AC2600 TEW-827DRU version 2.08B01 makes use of hardcoded credentials. It is possible to backup and restore device configurations via the man…EPSS 1.9%9.8CVE-2020-14080Trendnet tew-827dru firmware out-of-bounds write vulnerabilityTRENDnet TEW-827DRU devices through 2.06B04 contain a stack-based buffer overflow in the ssi binary. The overflow allows an unauthenticated user to e…EPSS 2.3%9.8CVE-2019-13276Trendnet tew-827dru firmware out-of-bounds write vulnerabilityTRENDnet TEW-827DRU with firmware up to and including 2.04B03 contains a stack-based buffer overflow in the ssi binary. The overflow allows an unauth…EPSS 2.8%9.8CVE-2019-13278Trendnet tew-827dru firmware os command injection vulnerabilityTRENDnet TEW-827DRU with firmware up to and including 2.04B03 contains multiple command injections when processing user input for the setup wizard, a…EPSS 8.8%9.8CVE-2019-13279Trendnet tew-827dru firmware out-of-bounds write vulnerabilityTRENDnet TEW-827DRU with firmware up to and including 2.04B03 contains multiple stack-based buffer overflows when processing user input for the setup…EPSS 2.7%

Source: NIST National Vulnerability Database (record CVE-2021-20158), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.