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Vulnerability record · CVE-2021-25274 · published 3 February 2021

CVE-2021-25274: Solarwinds orion platform deserialization of untrusted data vulnerability

Solarwinds · Orion Platform

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.

9.8 CVSS 3.1 Critical EPSS 36% · top 1.6% CWE-502 · Deserialization of untrusted data
9.8CVSS 3.1 base score, v2 10.0
36%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/full-system-control-with-new-solarwinds-orion-based-and- ExploitPatchThird Party Advisory
https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/full-system-control-with-new-solarwinds-orion-based-and- ExploitPatchThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2020-10148SolarWinds Orion API authentication bypass allows remote command executionThe SolarWinds Orion Platform API contains an authentication bypass (CWE-288/CWE-306) that lets a remote, unauthenticated attacker execute API comman…KEVEPSS 92%analysed9.8CVE-2021-27258Solarwinds orion platform improper access control vulnerabilityThis vulnerability allows remote attackers to execute escalate privileges on affected installations of SolarWinds Orion Platform 2020.2. Authenticati…EPSS 4.0%9.8CVE-2019-9546Solarwinds orion platform uncontrolled search path element vulnerabilitySolarWinds Orion Platform before 2018.4 Hotfix 2 allows privilege escalation through the RabbitMQ service.EPSS 2.8%9.6CVE-2021-35222Solarwinds orion platform cross-site scripting vulnerabilityThis vulnerability allows attackers to impersonate users and perform arbitrary actions leading to a Remote Code Execution (RCE) from the Alerts Setti…EPSS 2.6%9.0CVE-2020-13169Solarwinds orion platform cross-site scripting vulnerabilityStored XSS (Cross-Site Scripting) exists in the SolarWinds Orion Platform before before 2020.2.1 on multiple forms and pages. This vulnerability may …EPSS 2.2%8.8CVE-2022-36960Solarwinds orion platform improper input validation vulnerabilitySolarWinds Platform was susceptible to Improper Input Validation. This vulnerability allows a remote adversary with valid access to SolarWinds Web Co…EPSS 0.91%8.8CVE-2022-36964Solarwinds orion platform deserialization of untrusted data vulnerabilitySolarWinds Platform was susceptible to the Deserialization of Untrusted Data. This vulnerability allows a remote adversary with valid access to Solar…EPSS 17%8.8CVE-2022-36958SolarWinds Platform Web Console deserialization allows remote command executionSolarWinds Platform (Orion Platform) deserializes untrusted data, letting an attacker run arbitrary commands. The flaw is reachable remotely through …EPSS 82%analysed

Source: NIST National Vulnerability Database (record CVE-2021-25274), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.