CVE-2021-45840

Tos vulnerability

CVSS

9.8

EPSS

3.8%

EPSS pct

89th

Exploited

No known

It 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 input to /tos/index.php?app/app_start_stop.

Affected vendor

Terra Master

Affected product

Tos

CVSS vector

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

Published

2022-04-25

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 3.8% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 89% of all scored CVEs.

Check your external exposure to CVE-2021-45840

Confirm whether Terra Master Tos is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2021-45840.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-45840

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2021-45840 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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