Is CVE-2023-25821 in the CISA KEV catalog?

No. CVE-2023-25821 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-25821?

CVE-2023-25821 has a CVSS v3 base score of 5.7 (MEDIUM).

What is the EPSS score for CVE-2023-25821?

CVE-2023-25821 has an EPSS score of 0.95% (57th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-25821?

Upgrade nextcloud server to 24.0.7 or later.

CVE & CISA-KEV Catalog

CVE-2023-25821

MEDIUM

5.7

CVSS v3

NVD

Description

Nextcloud is an Open Source private cloud software. Versions 24.0.4 and above, prior to 24.0.7, and 25.0.0 and above, prior to 25.0.1, contain Improper Access Control. Secure view for internal shares can be circumvented if reshare permissions are also given. This issue is patched in versions 24.0.7 and 25.0.1. No workaround is available.

CWE-284Improper Access Control

How to fix

Remediation Available

nextcloud serverNVD

Affected:>= 24.0.4, < 24.0.7Fixed in:24.0.7CVE-2023-25821derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

Exploit Intelligence

0.95%probability of exploitation in 30 days

57thpercentile

Moderate risk: more likely to be exploited than 57% of all known CVEs.

References

Patch1

github.com

Exploit1

hackerone.com

Vendor Advisory1

github.com

Related Vulnerabilities

Other CWE-284 (Improper Access Control) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-27350	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2019-1653	High	7.5	100%	KEV	-
CVE-2023-23752	Medium	5.3	100%	KEV	Fix
CVE-2023-29298	High	7.5	100%	KEV	-
CVE-2023-38205	High	7.5	100%	KEV	-
CVE-2024-27348	Critical	9.8	99%	KEV	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.