How severe is CVE-2021-45837?

CVE-2021-45837 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-45837 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 16% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-45837?

CVE-2021-45837 affects Terra-master Tos. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-45837?

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

When was CVE-2021-45837 published?

CVE-2021-45837 was published on 2022-04-25 and last updated on 2026-06-17.

CVE-2021-45837

CVE-2021-45837 is a critical-severity vulnerability in Terra-master Tos with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 16% places it in the 96th percentile, indicating an elevated likelihood of exploitation.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 16% (96th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Terra-master Tos
Published: 2022-04-25
Last modified: 2026-06-17

Description

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 a specifically crafted input to /tos/index.php?app/del.

Frequently asked questions

What is CVE-2021-45837?: 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 a specifically crafted input to /tos/index.php?app/del.
How severe is CVE-2021-45837?: CVE-2021-45837 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-45837 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 16% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-45837?: CVE-2021-45837 affects Terra-master Tos. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-45837?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-45837 published?: CVE-2021-45837 was published on 2022-04-25 and last updated on 2026-06-17.

References

Affected products (1)

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

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