Security readout for executives and security teams
Plain-English summary
CVE-2021-35215 is a high-severity SolarWinds Orion Platform flaw where authenticated users could trigger unsafe deserialization and potentially run code. The known affected range is Orion Platform 2020.2.5 and earlier. Treat this as urgent for environments where Orion is reachable by many users or less-trusted network segments.
Executive priority
Prioritize remediation for any affected Orion deployment because this is authenticated RCE in a network management platform. Business urgency is highest where Orion has broad visibility, privileged integrations, or access to sensitive infrastructure telemetry.
Technical view
The issue is CWE-502 deserialization of untrusted data in ActionPluginBaseView, leading to remote code execution. The CVSS 3.1 vector is AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L, meaning adjacent access and low privileges are required, with high confidentiality and integrity impact.
Likely exposure
Exposure is likely limited to organizations running SolarWinds Orion Platform 2020.2.5 or earlier, especially where authenticated low-privilege users can reach the Orion interface from adjacent networks.
Exploitation context
The provided sources do not show CISA KEV listing or confirmed active exploitation. Exploitation requires authentication and adjacent network access, but low complexity and code execution impact make it serious where Orion access is broad.
Researcher notes
Evidence supports high risk but not confirmed active exploitation. The public bundle identifies insecure deserialization in ActionPluginBaseView, authentication requirement, affected versions, CVSS, and vendor/ZDI references. Patch specifics should be taken directly from SolarWinds guidance.
Mitigation direction
- Inventory SolarWinds Orion Platform versions and identify 2020.2.5 or earlier deployments.
- Review SolarWinds advisory and 2020.2.6 release notes for vendor-approved remediation.
- Move affected Orion deployments to a supported fixed version per SolarWinds guidance.
- Restrict Orion access to trusted administrative networks and users.
- Review SolarWinds secure configuration guidance for hardening recommendations.
Validation and detection
- Confirm deployed Orion Platform version from administrative records or product console.
- Verify whether any instance is version 2020.2.5 or earlier.
- Check access controls for low-privilege authenticated users and adjacent network reachability.
- Review logs for unusual authenticated activity against Orion administrative components.
- Document remediation status and compensating controls for each Orion instance.
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-2021-35215 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
- High
- CVSS
- 8.9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
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:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L2.36Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.9HighVector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://documentation.solarwinds.com/en/success_center/orionplatform/content/core-secure-configuration.htmCVE reference · x_refsource_MISC
- https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35215CVE reference · x_refsource_MISC
- https://documentation.solarwinds.co/enm/success_center/orionplatform/content/release_notes/orion_platform_2020-2-6_release_notes.htmCVE reference · x_refsource_MISC
- https://www.zerodayinitiative.com/advisories/ZDI-21-1245/CVE 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.