How severe is CVE-2021-45839?

CVE-2021-45839 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-45839 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-45839?

CVE-2021-45839 affects Terra-master Tos. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-45839?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-45839 published?

CVE-2021-45839 was published on 2022-04-25 and last updated on 2026-06-17.

CVE-2021-45839

CVE-2021-45839 is a medium-severity vulnerability in Terra-master Tos with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 9% (95th 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 obtain the first administrator's hash set up on the system in Terramaster F4-210, F2-210 TOS 4.2.X (4.2.15-2107141517) as well as other information such as MAC address, internal IP address etc. by performing a request to the /module/api.php?mobile/webNasIPS endpoint.

Frequently asked questions

What is CVE-2021-45839?: It is possible to obtain the first administrator's hash set up on the system in Terramaster F4-210, F2-210 TOS 4.2.X (4.2.15-2107141517) as well as other information such as MAC address, internal IP address etc. by performing a request to the /module/api.php?mobile/webNasIPS endpoint.
How severe is CVE-2021-45839?: CVE-2021-45839 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-45839 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-45839?: CVE-2021-45839 affects Terra-master Tos. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-45839?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-45839 published?: CVE-2021-45839 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:*:*:*:*:*:*:*

More vulnerabilities in Terra-master Tos

CVE-2021-45840 — Critical (CVSS 9.8): It is possible to execute arbitrary commands as root in Terramaster F4-210, F2-210 TOS 4.2.X (4.2.15-2107141517) by…
CVE-2021-45837 — Critical (CVSS 9.8): It is possible to execute arbitrary commands as root in Terramaster F4-210, F2-210 TOS 4.2.X (4.2.15-2107141517) by…
CVE-2020-15568 — Critical (CVSS 9.8): TerraMaster TOS before 4.1.29 has Invalid Parameter Checking that leads to code injection as root. This is a dynamic…
CVE-2020-28188 — Critical (CVSS 9.8): Remote Command Execution (RCE) vulnerability in TerraMaster TOS <= 4.2.06 allow remote unauthenticated attackers to…
CVE-2020-28187 — Critical (CVSS 9.8): Multiple directory traversal vulnerabilities in TerraMaster TOS <= 4.2.06 allow remote authenticated attackers to read,…
CVE-2021-45836 — High (CVSS 8.8): An authenticated attacker can execute arbitrary commands as root in Terramaster F4-210, F2-210 TOS 4.2.X…

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