Security readout for executives and security teams
Plain-English summary
CVE-2021-35249 lets a SolarWinds Serv-U domain administrator read configuration and user data belonging to other domains. The issue is read-only, but it can expose sensitive account and configuration information across tenant or domain boundaries. Logging is also weak: access may not clearly show which other domain was viewed.
Executive priority
Treat as a moderate-priority data exposure issue. It is not described as remotely exploitable without credentials, but it can break domain isolation in Serv-U environments and may expose sensitive user or configuration details with limited audit visibility.
Technical view
The vulnerability is a broken access control issue in SolarWinds Serv-U 15.3 and earlier. A low-privileged authenticated domain admin can access cross-domain configuration and user data without modification rights. CVSS 3.1 is 4.3, reflecting network access, low complexity, required privileges, and confidentiality-only impact.
Likely exposure
Organizations running SolarWinds Serv-U 15.3 or earlier are the stated affected population. Exposure is most relevant where Serv-U hosts multiple domains or tenants and delegates domain administrator rights to users who should only see their own domain.
Exploitation context
The source bundle does not show active exploitation, and KEV is false. Exploitation requires authenticated domain-admin access, not anonymous access. The impact is data disclosure rather than system takeover, but the logging limitation can make unauthorized viewing harder to investigate.
Researcher notes
Evidence is limited to the CVE description, SolarWinds advisory reference, and Serv-U 15.3.1 release notes reference. Do not assume broader SolarWinds product exposure. Validate only Serv-U 15.3 and previous versions unless vendor guidance states otherwise.
Mitigation direction
- Review SolarWinds advisory and Serv-U 15.3.1 release notes for the vendor remediation path.
- Upgrade or apply vendor-provided fixes according to SolarWinds guidance.
- Limit domain administrator roles to trusted users until remediation is complete.
- Review whether Serv-U domains contain sensitive user or configuration data.
Validation and detection
- Inventory Serv-U instances and confirm whether any run version 15.3 or earlier.
- Identify environments using multiple domains with delegated domain administrators.
- Review domain admin accounts for unnecessary or stale privileges.
- Check logs, noting sources say read-only cross-domain access may be poorly attributable.
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 lookupCVE-2021-35249 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
- 4.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/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:L/UI:N/S:U/C:L/I:N/A:N2.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.solarwinds.com/trust-center/security-advisories/CVE-2021-35249CVE reference · x_refsource_MISC
- https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-3-1_release_notes.htmCVE 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.