Security readout for executives and security teams
Plain-English summary
CVE-2021-35217 is a high-severity SolarWinds Orion Platform issue that could let a logged-in attacker run code through the Patch Manager Orion Platform Integration module. It matters because Orion often has broad visibility into infrastructure, so compromise could affect monitoring integrity and sensitive operational data.
Executive priority
Prioritize remediation for any affected Orion deployment, especially in production monitoring environments. The combination of remote code execution, low privilege requirement, and Orion’s infrastructure role creates meaningful business risk even without confirmed active exploitation.
Technical view
The issue is insecure deserialization of untrusted data in the Patch Manager Orion Platform Integration module. Sources state an authenticated attacker could exploit WSAsyncExecuteTasks deserialization to achieve remote code execution. Affected versions are SolarWinds Orion Platform 2020.2.5 and earlier.
Likely exposure
Exposure is most likely where SolarWinds Orion Platform 2020.2.5 or earlier is deployed with Patch Manager Orion Platform Integration enabled or reachable by authenticated users. The CVSS vector indicates adjacent-network access and low privileges are required.
Exploitation context
The provided bundle does not show CISA KEV listing or confirmed active exploitation. ZDI reported the vulnerability, and SolarWinds published an advisory. Treat it as serious because exploitation requires only low privileges after adjacent-network access, with high confidentiality and integrity impact.
Researcher notes
Key constraints are authenticated access, adjacent-network attack vector, and the Patch Manager Orion Platform Integration module. Evidence in the bundle names WSAsyncExecuteTasks as the deserialization path but does not provide safe detection details, exploit prevalence, or broader affected product claims.
Mitigation direction
- Identify Orion Platform instances running 2020.2.5 or earlier.
- Apply SolarWinds guidance for CVE-2021-35217 and upgrade affected deployments.
- Review Orion secure configuration guidance for hardening and access control.
- Restrict authenticated access to Orion administrative and integration functions.
- Limit network reachability to trusted management segments only.
Validation and detection
- Confirm Orion Platform version on every deployment.
- Verify whether Patch Manager Orion Platform Integration is installed or enabled.
- Review SolarWinds advisory and 2020.2.6 release notes for applicability.
- Audit low-privilege Orion accounts and remove unnecessary access.
- Review logs for unexpected activity involving WSAsyncExecuteTasks.
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.
Execution 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-2021-35217 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://documentation.solarwinds.com/en/success_center/orionplatform/content/release_notes/orion_platform_2020-2-6_release_notes.htmCVE reference · x_refsource_MISC
- https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35217CVE reference · x_refsource_MISC
- https://www.zerodayinitiative.com/advisories/ZDI-21-1247/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.