TI-2021-20873 Aliases CVE-2021-45841 GHSA-gmc4-3pqc-993q

In Terramaster F4-210, F2-210 TOS 4.2.X (4.2.15-2107141517), an attacker can self-sign…

MEDIUM 46CWE-287Published 2022-04-25 · Updated 2024-08-04

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: High
Impact type: Security bypass
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-287.

Summary

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.

Why it matters now

EPSS 0.08416 95th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 3

CPE	Versions	Role	Vendor
cpe:2.3:o:terra-master:tos:4.2.15-2107141517:::::::*	4.2.15-2107141517	Vulnerable	TerraMaster
cpe:2.3:h:terra-master:f2-210:-:::::::*	not specified by NVD	Running on	TerraMaster
cpe:2.3:h:terra-master:f4-210:-:::::::*	not specified by NVD	Running on	TerraMaster

cpe:2.3:o:terra-master:tos:4.2.15-2107141517:*:*:*:*:*:*:* Versions 4.2.15-2107141517 Vulnerable ·TerraMaster
cpe:2.3:h:terra-master:f2-210:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·TerraMaster
cpe:2.3:h:terra-master:f4-210:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·TerraMaster

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-45841
2026-10-03 Alias added: GHSA-gmc4-3pqc-993q
2026-11-04 EPSS moved to the 95th–99th percentile

References

Exploit 1

https://thatsn0tmy.site/posts/2021/12/how-to-summon-rces/

Other 1

http://packetstormsecurity.com/files/172881/TerraMaster-TOS-4.2.15-Remote-Code-Execution.html

TI-2020-17128 Remote Command Execution (RCE) vulnerability in TerraMaster TOS <= 4.2.06 allow remote… CVSS 3.1CRITICAL 9.8
TI-2020-12246 TerraMaster TOS before 4.1.29 has Invalid Parameter Checking that leads to code injection… CVSS 3.1CRITICAL 9.8
TI-2020-17127 Multiple directory traversal vulnerabilities in TerraMaster TOS <= 4.2.06 allow remote… CVSS 3.1CRITICAL 9.8
TI-2021-20870 It is possible to execute arbitrary commands as root in Terramaster F4-210, F2-210 TOS… CVSS 3.1CRITICAL 9.8
TI-2021-20872 It is possible to execute arbitrary commands as root in Terramaster F4-210, F2-210 TOS… CVSS 3.1CRITICAL 9.8
TI-2021-20869 An authenticated attacker can execute arbitrary commands as root in Terramaster F4-210… CVSS 3.1HIGH 8.8

See all 13 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences