How severe is CVE-2021-45836?

CVE-2021-45836 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-45836 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-45836?

CVE-2021-45836 affects Terra-master Tos. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-45836?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-45836 published?

CVE-2021-45836 was published on 2022-04-25 and last updated on 2026-06-17.

CVE-2021-45836

CVE-2021-45836 is a high-severity vulnerability in Terra-master Tos with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 9.0
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Terra-master Tos
Published: 2022-04-25
Last modified: 2026-06-17

Description

An 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 maliciously crafted input in the request through /tos/index.php?app/hand_app.

Frequently asked questions

What is CVE-2021-45836?: An 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 maliciously crafted input in the request through /tos/index.php?app/hand_app.
How severe is CVE-2021-45836?: CVE-2021-45836 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-45836 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-45836?: CVE-2021-45836 affects Terra-master Tos. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-45836?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-45836 published?: CVE-2021-45836 was published on 2022-04-25 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:o:terra-master:tos:4.2.15-2107141517:*:*:*:*:*:*:*

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