How severe is CVE-2018-13355?

CVE-2018-13355 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 none, integrity high, and availability none.

Is CVE-2018-13355 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-13355?

CVE-2018-13355 affects Terra-master Terramaster Operating System. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-13355?

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

When was CVE-2018-13355 published?

CVE-2018-13355 was published on 2018-11-27 and last updated on 2026-06-17.

CVE-2018-13355

CVE-2018-13355 is a medium-severity vulnerability in Terra-master Terramaster Operating System 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. The underlying weakness is classified as CWE-732.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-732
Affected product: Terra-master Terramaster Operating System
Published: 2018-11-27
Last modified: 2026-06-17

Description

Incorrect access controls in ajaxdata.php in TerraMaster TOS version 3.1.03 allow attackers to create user groups without proper authorization.

Frequently asked questions

What is CVE-2018-13355?: Incorrect access controls in ajaxdata.php in TerraMaster TOS version 3.1.03 allow attackers to create user groups without proper authorization.
How severe is CVE-2018-13355?: CVE-2018-13355 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 none, integrity high, and availability none.
Is CVE-2018-13355 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-13355?: CVE-2018-13355 affects Terra-master Terramaster Operating System. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-13355?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-13355 published?: CVE-2018-13355 was published on 2018-11-27 and last updated on 2026-06-17.

References

https://blog.securityevaluators.com/vulnerabilities-in-terramaster-tos-3-1-03-fb99cf88b86a

Affected products (1)

cpe:2.3:o:terra-master:terramaster_operating_system:3.1.03:*:*:*:*:*:*:*

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