What is CVE-2018-13337?

CVE-2018-13337 is a medium-severity vulnerability in Terra-Master Terramaster Operating System, classified under Session Fixation. CVSS score: 5.4/10. Published 2018-11-27.

How severe is CVE-2018-13337?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Is CVE-2018-13337 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Terra-Master Terramaster Operating System

CVE-2018-13337

Session Fixation in the web application for TerraMaster TOS version 3.1.03 allows attackers to control users' session cookies via JavaScript.

Published 2018-11-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.012 (66.7th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 66.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Terra-Master Terramaster Operating System — versions 3.1.03

Weakness classification (CWE)

CWE-384 — Session Fixation

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

blog.securityevaluators.com/vulnerabilities-in-terramaster-tos-3-1-03-fb99cf88b… (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2018-13337?: CVE-2018-13337 is a medium-severity vulnerability in Terra-Master Terramaster Operating System, classified under Session Fixation. CVSS score: 5.4/10. Published 2018-11-27.
How severe is CVE-2018-13337?: Medium severity. CVSS v3 base score is 5.4 out of 10.
Is CVE-2018-13337 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.