7.8

CVE-2021-3310: westerndigital my_cloud_os Link Following

CVSS: 7.8v3.1HighModified
Published 10-03-2021Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-3310 is a high (CVSS 7.8) Link Following vulnerability in westerndigital my_cloud_os. EPSS estimates a 1.01% chance of exploitation in the next 30 days, higher than 62.4% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (NVD)
EPSS score
1.01%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 10-03-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

Western Digital My Cloud OS 5 devices before 5.10.122 mishandle Symbolic Link Following on SMB and AFP shares. This can lead to code execution and information disclosure (by reading local files).

CVSS metrics

2 scores · 1 source · 2 versions

EPSS trend

Probability

1.01%

Chance of exploitation in the next 30 days

Percentile

62%

Versus all other CVEs

30-day change

0.00 pp

From 1.01% on 20-09-2026

20-09-202620-10-2026
EPSS score
1.01%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Westerndigital1 product

1 vendor · 1 product

References

2 links