CVE-2020-8259
CVE-2020-8259 is a high-severity vulnerability in Nextcloud Nextcloud Server with a CVSS 3.x base score of 8.1. 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: High (CVSS 3.x base score 8.1)
- CVSS v2: 5.5
- EPSS exploit prediction: 1% (50th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-522
- Affected product: Nextcloud Nextcloud Server
- Published:
- Last modified:
Description
Insufficient protection of the server-side encryption keys in Nextcloud Server 19.0.1 allowed an attacker to replace the encryption keys.
Frequently asked questions
- What is CVE-2020-8259?
- Insufficient protection of the server-side encryption keys in Nextcloud Server 19.0.1 allowed an attacker to replace the encryption keys.
- How severe is CVE-2020-8259?
- CVE-2020-8259 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
- Is CVE-2020-8259 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2020-8259?
- CVE-2020-8259 affects Nextcloud Nextcloud Server. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2020-8259?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2020-8259 published?
- CVE-2020-8259 was published on 2020-11-16 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*
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