Is CVE-2021-25274 actively exploited?

No active exploitation of CVE-2021-25274 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-25274 be exploited remotely?

Yes. CVE-2021-25274 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-25274?

CVE-2021-25274 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2021-25274

CRITICAL

CVE-2021-25274

CWE-502Published: February 3, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

The Collector Service in SolarWinds Orion Platform before 2020.2.4 uses MSMQ (Microsoft Message Queue) and doesn't set permissions on its private queues. As a result, remote unauthenticated clients can send messages to TCP port 1801 that the Collector Service will process. Additionally, upon processing of such messages, the service deserializes them in insecure manner, allowing remote arbitrary code execution as LocalSystem.

NVD Source

Technical Analysis

CVE-2021-25274 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

From a weakness classification perspective (CWE-502): Insecure deserialization vulnerabilities allow attackers to inject malicious objects during deserialization, potentially enabling remote code execution.