Insufficient protection of the server-side encryption keys in Nextcloud Server 19.0.1 allowed an attacker to replace the public key to decr…

published 2020-11-16 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-29045

cvss: 4.4; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 25%
public exploits: 0; none known

Insufficient protection of the server-side encryption keys in Nextcloud Server 19.0.1 allowed an attacker to replace the public key to decrypt them later on.

Patch / fix

fixed in 1

nextcloud nextcloud_server 20.0.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-8152 updated 2025-11-21 cvss 5.3

nextcloud: Improper confidentiality protection of server-side encryption keys

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.32% chance of exploitation in the next 30 days, higher than 25% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

hackerone.com https://hackerone.com/reports/743505 referenced PoC, tagged "exploit" by a source, unverified
seclists.org http://seclists.org/fulldisclosure/2020/Dec/54 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	4.4	CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
NVD	2.0	2.1	AV:L/AC:L/Au:N/C:N/I:P/A:N

Affected products

n/a Nextcloud Server

Classification

Weakness

CWE-522 Insufficiently Protected Credentials

References

hackerone.com /reports/743505
exploit, issue-tracking, third-party-advisory
seclists.org /fulldisclosure/2020/Dec/54
mailing-list, exploit, third-party-advisory
nextcloud.com /security/advisory/?id=NC-SA-2020-040
broken-link, vendor-advisory

Sources

CVE List CVE-2020-8152
NVD CVE-2020-8152

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary