CVE-2021-34812
CVE-2021-34812 is a medium-severity vulnerability in Synology Calendar with a CVSS 3.x base score of 5.8. 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-798.
Key facts
- Severity: Medium (CVSS 3.x base score 5.8)
- CVSS v2: 5.0
- EPSS exploit prediction: 1% (62nd percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-798
- Affected product: Synology Calendar
- Published:
- Last modified:
Description
Use of hard-coded credentials vulnerability in php component in Synology Calendar before 2.4.0-0761 allows remote attackers to obtain sensitive information via unspecified vectors.
Frequently asked questions
- What is CVE-2021-34812?
- Use of hard-coded credentials vulnerability in php component in Synology Calendar before 2.4.0-0761 allows remote attackers to obtain sensitive information via unspecified vectors.
- How severe is CVE-2021-34812?
- CVE-2021-34812 has a CVSS 3.x base score of 5.8, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
- Is CVE-2021-34812 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-34812?
- CVE-2021-34812 affects Synology Calendar. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-34812?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2021-34812 published?
- CVE-2021-34812 was published on 2021-06-18 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:synology:calendar:*:*:*:*:*:*:*:*
More vulnerabilities in Synology Calendar
- CVE-2019-11829 — High (CVSS 7.3): OS command injection vulnerability in drivers_syno_import_user.php in Synology Calendar before 2.3.1-0617 allows remote…
- CVE-2022-22686 — Medium (CVSS 6.5): Cross-Site Request Forgery (CSRF) vulnerability in webapi component in Synology Calendar before 2.3.4-0631 allows…
- CVE-2022-22682 — Medium (CVSS 6.5): Improper neutralization of input during web page generation ('Cross-site Scripting') vulnerability in Event Management…
- CVE-2019-11825 — Medium (CVSS 6.5): Cross-site scripting (XSS) vulnerability in Event Editor in Synology Calendar before 2.3.0-0615 allows remote attackers…
- CVE-2018-8915 — Medium (CVSS 6.5): Cross-site scripting (XSS) vulnerability in Notification Center in Synology Calendar before 2.1.1-0502 allows remote…
- CVE-2017-15891 — Medium (CVSS 6.5): Improper access control vulnerability in SYNO.Cal.EventBase in Synology Calendar before 2.0.1-0242 allows remote…
All CVEs affecting Synology Calendar →
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- CVE-2026-22769 — Critical (CVSS 10.0): Dell RecoverPoint for Virtual Machines, versions prior to 6.0.3.1 HF1, contain a hardcoded credential vulnerability.…
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- CVE-2025-7503 — Critical (CVSS 10.0): An OEM IP camera manufactured by Shenzhen Liandian Communication Technology LTD exposes a Telnet service (port 23) with…
- CVE-2025-20309 — Critical (CVSS 10.0): A vulnerability in Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session…
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