Security readout for executives and security teams
Plain-English summary
CVE-2021-35949 is an ownCloud Server issue where upload-only shares did not fully enforce permission checks. An attacker could list metadata about a share even when the share was intended only for uploading. The evidence points to information exposure, not data modification, account takeover, or remote code execution.
Executive priority
Treat this as a targeted information-exposure issue requiring planned remediation. Prioritize internet-facing ownCloud systems and environments using upload-only shares. Urgency is lower than a code-execution flaw, but metadata leakage can still expose sensitive operational context.
Technical view
The vulnerability affects ownCloud Server before 10.8.0 in the shareinfo controller. The controller allowed permission-check bypass for upload-only shares, exposing share metadata. Public source data does not provide CVSS, CWE, detailed prerequisites, or a confirmed exploit path, so operational validation should focus on version and share configuration.
Likely exposure
Exposure is most likely for organizations running ownCloud Server versions before 10.8.0 that use upload-only shares. Internet-accessible deployments or broadly distributed share links would increase practical business concern, but the supplied sources do not quantify affected configurations.
Exploitation context
The source bundle does not cite CISA KEV listing or active exploitation. It describes a permission-bypass condition that can reveal metadata about upload-only shares. No exploit maturity, automation, authentication requirements, or attacker prevalence is provided in the supplied evidence.
Researcher notes
Evidence is sparse: no CVSS, CWE, exploit status, or detailed affected CPEs are provided. The central facts are ownCloud Server before 10.8.0, shareinfo controller, upload-only shares, permission-check bypass, and metadata listing. Avoid assuming broader file access without vendor evidence.
Mitigation direction
- Upgrade ownCloud Server to 10.8.0 or later where applicable.
- Review ownCloud's advisory and release notes for vendor-specific remediation guidance.
- Inventory upload-only shares and remove any no longer required.
- Limit public exposure of ownCloud until affected versions are remediated.
Validation and detection
- Confirm whether any ownCloud Server deployment is earlier than 10.8.0.
- Identify whether upload-only shares are enabled or actively used.
- Review access logs for unusual shareinfo-related metadata access.
- Verify remediation against ownCloud release notes and advisory guidance.
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.
CVE-2021-35949 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://doc.owncloud.com/server/admin_manual/release_notes.htmlCVE reference · x_refsource_MISC
- https://owncloud.com/security-advisories/cve-2021-35949/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.