CVE-2019-11829

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-06-30 · updated 2026-06-17
Weakness: CWE-78

Description

OS command injection vulnerability in drivers_syno_import_user.php in Synology Calendar before 2.3.1-0617 allows remote attackers to execute arbitrary commands via the crafted 'X-Real-IP' header.

Affected products

Synology Calendar: before 2.3.1-0617 — fixed in 2.3.1-0617

How to fix

Upgrade to a fixed version: Synology Calendar 2.3.1-0617. Check the vendor advisory for mitigations.

References

https://www.synology.com/security/advisory/Synology_SA_19_12
https://www.synology.com/security/advisory/Synology_SA_19_12

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