Security readout for executives and security teams
Plain-English summary
SolarWinds Web Help Desk allowed risky HTTP methods on its web server. An unauthenticated network user could send PUT or DELETE requests that should normally be disabled, potentially changing server-side content or resource handling. The known impact is integrity loss, not data theft or full compromise.
Executive priority
Treat as a moderate-priority hygiene issue. Prioritize internet-facing or widely accessible help desk systems first, then complete remediation across internal deployments during the next maintenance window.
Technical view
CVE-2021-35243 affects SolarWinds Web Help Desk 12.7.7 and earlier. The embedded web server exposed HTTP PUT and DELETE methods, mapped to CWE-749. CVSS 3.1 is 5.3, network reachable, low complexity, no privileges, no user interaction, with low integrity impact only.
Likely exposure
Exposure is most relevant where SolarWinds Web Help Desk is reachable over a network, especially internet-facing or broadly accessible internal deployments running 12.7.7 or earlier.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation evidence. The weakness is still operationally important because it is unauthenticated and network reachable, but the documented impact is limited to integrity.
Researcher notes
Evidence supports enabled PUT and DELETE methods with integrity impact. Sources do not establish confidentiality impact, availability impact, authentication bypass, exploit availability, or observed exploitation. Version and remediation details should be confirmed against SolarWinds advisory text.
Mitigation direction
- Identify all SolarWinds Web Help Desk deployments and versions.
- Review the SolarWinds advisory and Hotfix 1 release notes.
- Apply the SolarWinds hotfix or later vendor-supported release after confirming guidance.
- Restrict Web Help Desk access to trusted networks where feasible.
- Disable unsafe HTTP methods if supported by vendor configuration guidance.
Validation and detection
- Confirm no Web Help Desk instance runs 12.7.7 or earlier.
- Verify HTTP PUT and DELETE are not accepted by the Web Help Desk server.
- Check external exposure through asset inventory and perimeter scanning results.
- Review change records for SolarWinds hotfix or upgrade completion.
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-749: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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 lookupCVE-2021-35243 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
- 5.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/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:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N3.91.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35243CVE reference · x_refsource_MISC
- https://support.solarwinds.com/SuccessCenter/s/article/Web-Help-Desk-12-7-7-Hotfix-1-Release-Notes?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.
Exposed Dangerous Method or Function
Exposed Dangerous Method or Function represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.