What’s Vulnerable › Vulnerabilities

CVE-2021-43928

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-02-07 · updated 2026-06-17
• Weakness: CWE-78

Description

Improper neutralization of special elements used in an OS command ('OS Command Injection') vulnerability in mail sending and receiving component in Synology Mail Station before 20211105-10315 allows remote authenticated users to execute arbitrary commands via unspecified vectors.

Affected products

• Synology Mail Station: before 20211105 — fixed in 20211105

How to fix

Upgrade to a fixed version: Synology Mail Station 20211105. Check the vendor advisory for mitigations.

References

• https://www.synology.com/security/advisory/Synology_SA_21_28
• https://www.synology.com/security/advisory/Synology_SA_21_28

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