Security readout for executives and security teams
Plain-English summary
SolarWinds Orion Platform 2020.2.6 and earlier had a Resource.aspx reflected XSS flaw. If a user is tricked into interacting with malicious content, an attacker could impersonate that user and perform actions, with the advisory description linking this path to RCE from Alerts Settings.
Executive priority
Treat this as a high-priority remediation item for affected Orion environments. It targets a privileged monitoring platform and can support user impersonation and serious downstream impact, but the supplied evidence does not confirm active exploitation.
Technical view
CVE-2021-35222 is CWE-79 in SolarWinds Orion Platform Resource.aspx. CVSS 8.0: adjacent-network attack vector, low complexity, no privileges required, user interaction required, changed scope, high confidentiality impact, and low integrity and availability impact.
Likely exposure
Organizations running SolarWinds Orion Platform 2020.2.6 or earlier are the stated affected population. Exposure is most relevant where Orion administrative users can be targeted and where Orion interfaces are reachable from adjacent or internal networks.
Exploitation context
The bundle does not show CISA KEV listing or confirmed active exploitation. The risk is still material because successful abuse may let attackers impersonate users and perform actions in Orion, potentially reaching RCE through Alerts Settings.
Researcher notes
Focus validation on version state, hotfix presence, administrative interface exposure, and relevant Orion logs. The source bundle identifies the affected product and impact, but does not provide detailed exploit conditions beyond CVSS, Resource.aspx XSS, user interaction, and the Alerts Settings RCE path.
Mitigation direction
- Apply SolarWinds Orion Platform 2020.2.6 Hotfix 1 or current vendor guidance.
- Use the SolarWinds CVE-2021-35222 mitigation article if immediate patching is delayed.
- Review SolarWinds secure configuration guidance for Orion deployments.
- Restrict Orion administrative interface access to trusted management networks.
- Prioritize remediation for Orion servers managing critical infrastructure or privileged monitoring data.
Validation and detection
- Inventory all SolarWinds Orion Platform instances and record installed versions.
- Confirm whether affected instances are 2020.2.6 or earlier.
- Verify whether Orion Platform 2020.2.6 Hotfix 1 or later remediation is installed.
- Review access paths to Resource.aspx and Orion administrative pages.
- Check Orion and web logs for unusual Resource.aspx requests or Alerts Settings changes.
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-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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-2021-35222 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 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:L/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:N/UI:R/S:C/C:H/I:L/A:L2.15.3Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8HighVector: CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:L/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://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-2021-35222CVE reference · x_refsource_MISC
- https://support.solarwinds.com/SuccessCenter/s/article/Mitigate-the-Resource-aspx-Reflected-Cross-Site-Scripting-Vulnerability-CVE-2021-35222?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 Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.