How severe is CVE-2019-11820?

CVE-2019-11820 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2019-11820 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-11820?

CVE-2019-11820 affects Synology Calendar. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-11820?

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

When was CVE-2019-11820 published?

CVE-2019-11820 was published on 2019-05-09 and last updated on 2026-06-17.

CVE-2019-11820

CVE-2019-11820 is a medium-severity vulnerability in Synology Calendar with a CVSS 3.x base score of 5.5. 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-522.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v2: 2.1
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-522
Affected product: Synology Calendar
Published: 2019-05-09
Last modified: 2026-06-17

Description

Information exposure through process environment vulnerability in Synology Calendar before 2.3.3-0620 allows local users to obtain credentials via cmdline.

Frequently asked questions

What is CVE-2019-11820?: Information exposure through process environment vulnerability in Synology Calendar before 2.3.3-0620 allows local users to obtain credentials via cmdline.
How severe is CVE-2019-11820?: CVE-2019-11820 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2019-11820 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-11820?: CVE-2019-11820 affects Synology Calendar. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-11820?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-11820 published?: CVE-2019-11820 was published on 2019-05-09 and last updated on 2026-06-17.

References

https://www.synology.com/security/advisory/Synology_SA_19_21

Affected products (1)

cpe:2.3:a:synology:calendar:*:*:*:*:*:*:*:*

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