Security readout for executives and security teams
Plain-English summary
SolarWinds Orion Platform 2020.2.6 and earlier has an access-control flaw in alert import handling. A low-privileged user on an adjacent network could tamper with ImportAlert behavior and potentially reach remote code execution from the Alerts Settings page. The source bundle does not show CISA KEV listing or confirmed active exploitation.
Executive priority
Treat as a planned security update with elevated attention for SolarWinds environments. Prioritize remediation on production monitoring systems because compromise of monitoring infrastructure can affect operational trust and change visibility.
Technical view
CVE-2021-35221 is a CWE-284 improper access control issue in Orion Platform's ImportAlert function. The CVSS 3.1 vector is AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N, indicating adjacent-network access, low privileges, no user interaction, limited confidentiality impact, and high integrity impact.
Likely exposure
Exposure is limited to organizations running SolarWinds Orion Platform 2020.2.6 or earlier, especially where lower-privileged users can access Alerts Settings or related alert-import functionality.
Exploitation context
No provided source confirms active exploitation, and the CVE is not marked as KEV. Risk is still meaningful because the described outcome includes remote code execution, but prerequisites reduce broad internet-scale exposure.
Researcher notes
The bundle identifies the vulnerable function, affected product range, CVSS vector, and vendor references, but not exploit mechanics or detailed indicators. Avoid inferring broader SolarWinds products or internet-exposed attack paths from this evidence alone.
Mitigation direction
- Identify Orion Platform instances and their exact versions.
- Review SolarWinds advisory and mitigation guidance for CVE-2021-35221.
- Apply SolarWinds-supported Hotfix 1 or later vendor-recommended remediation where applicable.
- Restrict Orion administrative and alert-management access to trusted users.
- Review SolarWinds secure configuration guidance for Orion deployments.
Validation and detection
- Confirm whether any Orion Platform instance is version 2020.2.6 or earlier.
- Verify vendor hotfix or mitigation status on each affected instance.
- Review role assignments for access to Alerts Settings and alert import features.
- Check change records for unexpected alert configuration imports or modifications.
- Document residual exposure where vendor remediation is not yet applied.
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-284: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. 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-2021-35221 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
- Medium
- CVSS
- 6.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
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:U/C:L/I:H/A:N2.14.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.3MediumVector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
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://support.solarwinds.com/SuccessCenter/s/article/Orion-Platform-2020-2-6-Hotfix-1?language=en_USCVE reference · x_refsource_MISC
- https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35221CVE reference · x_refsource_MISC
- https://support.solarwinds.com/SuccessCenter/s/article/Mitigate-the-ImportAlert-Improper-Access-Control-Tampering-Vulnerability-CVE-2021-35221?language=en_USCVE 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.
Improper Access Control
Improper Access Control represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.