Is CVE-2021-42835 in the CISA KEV catalog?

No. CVE-2021-42835 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-42835?

CVE-2021-42835 has a CVSS v3 base score of 7.0 (HIGH).

What is the EPSS score for CVE-2021-42835?

CVE-2021-42835 has an EPSS score of 1.17% (63th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-42835?

Upgrade Plex Media Server to 1.25.0.5282 or later.

CVE & CISA-KEV Catalog

CVE-2021-42835

HIGH

7.0

CVSS v3

NVD

Description

An issue was discovered in Plex Media Server through 1.24.4.5081-e362dc1ee. An attacker (with a foothold in a endpoint via a low-privileged user account) can access the exposed RPC service of the update service component. This RPC functionality allows the attacker to interact with the RPC functionality and execute code from a path of his choice (local, or remote via SMB) because of a TOCTOU race condition. This code execution is in the context of the Plex update service (which runs as SYSTEM).

CWE-367TOCTOU Race Condition

How to fix

Remediation Available

Plex Media ServerWindows application

Affected:1.25.0.5282Fixed in:1.25.0.5282Plex, Inc.

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 VectorLocal

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.17%probability of exploitation in 30 days

63rdpercentile

Moderate risk: more likely to be exploited than 63% of all known CVEs.

References

Exploit1

ir-on.io

Vendor Advisory2

Third-Party Advisory1

bugsec.com

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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.