What’s Vulnerable › Vulnerabilities

CVE-2021-25274

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 36.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-02-03 · updated 2026-06-17
• Weakness: CWE-502

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.

Affected products

• SolarWinds Orion Platform: before 2020.2.4 — fixed in 2020.2.4

How to fix

Upgrade to a fixed version: SolarWinds Orion Platform 2020.2.4. Check the vendor advisory for mitigations.

References

• https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/full-system-control-with-new-solarwinds-orion-based-and-serv-u-ftp-vulnerabilities/
• https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/full-system-control-with-new-solarwinds-orion-based-and-serv-u-ftp-vulnerabilities/

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