Security readout for executives and security teams
Plain-English summary
CVE-2021-31474 is a critical remote code execution issue in SolarWinds Network Performance Monitor 2020.2.1. An unauthenticated remote attacker could exploit unsafe deserialization in SolarWinds.Serialization to run code as SYSTEM. A compromised monitoring server can become a high-impact foothold because it is usually trusted across the environment.
Executive priority
High priority for any organization using the affected SolarWinds version. This is unauthenticated remote code execution as SYSTEM on a monitoring platform, so remediation should be handled urgently after confirming exposure. If the product is absent or not version 2020.2.1, priority drops substantially.
Technical view
The issue is CWE-502 deserialization of untrusted data in the SolarWinds.Serialization library. The supplied CVSS v3.0 score is 9.8, with network attack vector, low complexity, no privileges, and no user interaction. Successful exploitation allows arbitrary code execution in the SYSTEM context on affected installations.
Likely exposure
Exposure is limited to organizations running SolarWinds Network Performance Monitor 2020.2.1. Internet-facing or broadly reachable SolarWinds servers would carry the highest risk. The bundle does not identify other affected versions or products, so inventory validation should be version-specific.
Exploitation context
The provided sources support unauthenticated remote code execution, but do not state active exploitation. The CVE is not marked as CISA KEV in the bundle. Treat exploitability as serious due to the unauthenticated network vector and SYSTEM-level impact, not because confirmed exploitation was cited.
Researcher notes
The key technical condition is untrusted deserialization in SolarWinds.Serialization. The bundle names ZDI-CAN-12213 and affected NPM 2020.2.1, but does not provide exploit details, affected version ranges, or explicit patch text. Avoid expanding scope beyond the cited product/version without vendor confirmation.
Mitigation direction
- Identify all SolarWinds Network Performance Monitor deployments and versions.
- Prioritize remediation for NPM 2020.2.1 instances.
- Check SolarWinds release notes and vendor guidance for fixed versions.
- Restrict network access to SolarWinds management interfaces where possible.
- Monitor SolarWinds hosts for unexpected privileged process activity.
Validation and detection
- Confirm whether any asset runs SolarWinds Network Performance Monitor 2020.2.1.
- Verify SolarWinds servers are not broadly internet-accessible.
- Check patch status against SolarWinds advisory or release notes.
- Review logs for unusual activity around SolarWinds services.
- Validate compensating access controls around management interfaces.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-502: Code execution behavior lookup
Code execution and unsafe deserialization weaknesses often justify reviewing execution behavior and process telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-31474 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
9.8CriticalVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.zerodayinitiative.com/advisories/ZDI-21-602/CVE reference · x_refsource_MISC
- https://documentation.solarwinds.com/en/success_center/sam/content/release_notes/sam_2020-2-5_release_notes.htmCVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Deserialization of Untrusted Data
Deserialization of Untrusted Data represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.