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Vulnerability record · CVE-2021-45841 · published 25 April 2022

CVE-2021-45841: Terra-master tos improper authentication vulnerability

Terra Master · Tos

In Terramaster F4-210, F2-210 TOS 4.2.X (4.2.15-2107141517), an attacker can self-sign session cookies by knowing the target's MAC address and the user's password hash. Guest users (disabled by default) can be abused using a null/empty hash and allow an unauthenticated attacker to login as guest.

8.1 CVSS 3.1 High EPSS 8.4% · top 5.2% CWE-287 · Improper authenticationCWE-798 · Hard-coded credentials
8.1CVSS 3.1 base score, v2 6.8
8.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

In Terramaster F4-210, F2-210 TOS 4.2.X (4.2.15-2107141517), an attacker can self-sign session cookies by knowing the target's MAC address and the user's password hash. Guest users (disabled by default) can be abused using a null/empty hash and allow an unauthenticated attacker to login as guest.

CVSS:3.1/AV:N/AC:H/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
http://packetstormsecurity.com/files/172881/TerraMaster-TOS-4.2.15-Remote-Code-Execution.html
https://thatsn0tmy.site/posts/2021/12/how-to-summon-rces/ ExploitThird Party Advisory
http://packetstormsecurity.com/files/172881/TerraMaster-TOS-4.2.15-Remote-Code-Execution.html
https://thatsn0tmy.site/posts/2021/12/how-to-summon-rces/ ExploitThird Party Advisory

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Related vulnerabilities

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

9.8CVE-2021-45837Terra-master tos vulnerabilityIt is possible to execute arbitrary commands as root in Terramaster F4-210, F2-210 TOS 4.2.X (4.2.15-2107141517) by sending a specifically crafted in…EPSS 16%9.8CVE-2021-45840Terra-master tos vulnerabilityIt is possible to execute arbitrary commands as root in Terramaster F4-210, F2-210 TOS 4.2.X (4.2.15-2107141517) by sending specifically crafted inpu…EPSS 3.9%9.8CVE-2020-15568Terra-master tos improper control of dynamically-managed code vulnerabilityTerraMaster TOS before 4.1.29 has Invalid Parameter Checking that leads to code injection as root. This is a dynamic class method invocation vulnerab…EPSS 29%9.8CVE-2020-28187Terra-master tos path traversal vulnerabilityMultiple directory traversal vulnerabilities in TerraMaster TOS <= 4.2.06 allow remote authenticated attackers to read, edit or delete any file withi…EPSS 16%9.8CVE-2020-28188TerraMaster TOS unauthenticated OS command injection in makecvs.phpTerraMaster TOS 4.2.06 and earlier passes the Event parameter of /include/makecvs.php into OS commands without sanitization, allowing command injecti…EPSS 97%analysed8.8CVE-2021-45836Terra-master tos vulnerabilityAn authenticated attacker can execute arbitrary commands as root in Terramaster F4-210, F2-210 TOS 4.2.X (4.2.15-2107141517) by injecting a malicious…EPSS 2.5%8.1CVE-2020-29189Terra-master tos vulnerabilityIncorrect Access Control vulnerability in TerraMaster TOS <= 4.2.06 allows remote authenticated attackers to bypass read-only restriction and obtain …EPSS 1.9%7.5CVE-2021-45842Terra-master tos vulnerabilityIt is possible to obtain the first administrator's hash set up in Terramaster F4-210, F2-210 TOS 4.2.X (4.2.15-2107141517) on the system as well as o…EPSS 2.4%

Source: NIST National Vulnerability Database (record CVE-2021-45841), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.