Security readout for executives and security teams
Plain-English summary
SolarWinds Patch Manager 2020.2.5 and earlier contain a remote code execution flaw in the Orion Platform Integration module. An authenticated attacker with HTTP network access could exploit unsafe deserialization to run code. This is high urgency for environments where Patch Manager is reachable by lower-privileged users or broadly accessible internal networks.
Executive priority
Prioritize remediation in environments with broad internal access or many Patch Manager users. The issue can lead to remote code execution after authentication, so business risk is material even without public evidence of active exploitation in the provided sources.
Technical view
CVE-2021-35216 is CWE-502 insecure deserialization in SolarWinds Patch Manager Orion Platform Integration. The CVSS 3.1 score is 8.9 with adjacent-network access, low complexity, low privileges, no user interaction, changed scope, high confidentiality and integrity impact, and low availability impact.
Likely exposure
Exposure is limited to SolarWinds Patch Manager 2020.2.5 and previous versions using the Orion Platform Integration module, where authenticated users can reach the relevant HTTP interface. The source bundle does not provide CPEs or deployment-specific indicators.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. Exploitation requires authentication and network access via HTTP. No exploit method, payload, or weaponization details are included in the source bundle.
Researcher notes
The evidence supports high severity, authenticated HTTP exposure, and affected versions through 2020.2.5. The bundle does not include CPEs, detailed root-cause traces, exploit status, or explicit mitigation text beyond vendor advisory and release-note references.
Mitigation direction
- Identify any SolarWinds Patch Manager deployments at version 2020.2.5 or earlier.
- Review SolarWinds advisory and Patch Manager 2020.2.6 release notes for vendor remediation.
- Restrict HTTP access to Patch Manager integration surfaces to trusted administrative networks.
- Review accounts with access to Patch Manager and remove unnecessary privileges.
- Monitor SolarWinds and ZDI references for updated guidance or indicators.
Validation and detection
- Inventory SolarWinds Patch Manager versions across production, staging, and legacy systems.
- Confirm whether the Orion Platform Integration module is installed or enabled.
- Validate who can authenticate to the relevant HTTP interface.
- Check network controls limiting access to trusted administrative segments.
- Review logs for unusual authenticated activity around Patch Manager integration endpoints.
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-2021-35216 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/patchman/content/release_notes/patchman_2020-2-6_release_notes.htmCVE reference · x_refsource_MISC
- https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35216CVE reference · x_refsource_MISC
- https://www.zerodayinitiative.com/advisories/ZDI-21-1246/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.