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Vulnerability record · CVE-2021-42887 · published 3 June 2022

CVE-2021-42887: Totolink ex1200t firmware vulnerability

TTotolink · Ex1200t Firmware

In TOTOLINK EX1200T V4.1.2cu.5215, an attacker can bypass login by sending a specific request through formLoginAuth.htm.

9.8 CVSS 3.1 Critical EPSS 44% · top 1.3%
9.8CVSS 3.1 base score, v2 7.5
44%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

In TOTOLINK EX1200T V4.1.2cu.5215, an attacker can bypass login by sending a specific request through formLoginAuth.htm.

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://github.com/p1Kk/vuln/blob/main/totolink_ex1200t_login_bypass.md ExploitThird Party Advisory
https://github.com/p1Kk/vuln/blob/main/totolink_ex1200t_login_bypass.md ExploitThird Party Advisory

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Related vulnerabilities

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

9.8CVE-2025-51451Totolink ex1200t firmware improper authentication vulnerabilityIn TOTOLINK EX1200T firmware 4.1.2cu.5215, an attacker can bypass login by sending a specific request through formLoginAuth.htm.EPSS 0.38%9.8CVE-2025-28038Totolink ex1200t firmware os command injection vulnerabilityTOTOLINK EX1200T V4.1.2cu.5232_B20210713 was found to contain a pre-auth remote command execution vulnerability in the setWebWlanIdx function through…EPSS 1.2%9.8CVE-2025-28039Totolink ex1200t firmware os command injection vulnerabilityTOTOLINK EX1200T V4.1.2cu.5232_B20210713 was found to contain a pre-auth remote command execution vulnerability in the setUpgradeFW function through …EPSS 1.2%9.8CVE-2023-52032Totolink ex1200t firmware vulnerabilityTOTOlink EX1200T V4.1.2cu.5232_B20210713 was discovered to contain a remote command execution (RCE) vulnerability via the "main" function.EPSS 1.6%9.8CVE-2021-42890Totolink ex1200t firmware os command injection vulnerabilityTOTOLINK EX1200T V4.1.2cu.5215 contains a remote command injection vulnerability in function NTPSyncWithHost of the file system.so which can control …EPSS 1.9%9.8CVE-2021-42888Totolink ex1200t firmware os command injection vulnerabilityTOTOLINK EX1200T V4.1.2cu.5215 contains a remote command injection vulnerability in function setLanguageCfg of the file global.so which can control l…EPSS 1.9%9.8CVE-2021-42884Totolink ex1200t firmware os command injection vulnerabilityTOTOLINK EX1200T V4.1.2cu.5215 contains a remote command injection vulnerability in function setDeviceName of the file global.so which can control th…EPSS 2.4%9.8CVE-2021-42885Totolink ex1200t firmware os command injection vulnerabilityTOTOLINK EX1200T V4.1.2cu.5215 contains a remote command injection vulnerability in function setDeviceMac of the file global.so which can control dev…EPSS 2.4%

Source: NIST National Vulnerability Database (record CVE-2021-42887), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.