Security readout for executives and security teams
Plain-English summary
CVE-2021-35947 is an ownCloud Server information disclosure issue. In versions before 10.8.0, a remote attacker could manipulate a public-share URL with invalid characters and learn the internal file path and username tied to that public share. The sources do not indicate file-content disclosure, account takeover, or active exploitation.
Executive priority
Prioritize remediation during the next standard security maintenance cycle, sooner for internet-facing ownCloud systems with public sharing. This is not evidenced as actively exploited or destructive, but it can expose internal identifiers useful for follow-on attacks.
Technical view
The issue is in ownCloud Server's public share controller before 10.8.0. Malformed public-share URLs containing invalid characters can cause disclosure of internal path information and the username associated with the share. The provided sources do not include CVSS, CWE, exploit details, or broader affected-product metadata.
Likely exposure
Exposure is most likely for internet-accessible ownCloud Server deployments below 10.8.0 that use public share links. Risk is limited to information disclosure based on the supplied sources, but leaked usernames and internal paths can aid reconnaissance.
Exploitation context
The CVE description says a remote attacker can trigger the disclosure through invalid characters in a public-share URL. The bundle marks KEV as false, and no cited source states active exploitation. Treat exploit activity as unconfirmed.
Researcher notes
Evidence is narrow: the public bundle identifies only ownCloud Server before 10.8.0 and describes username plus internal path disclosure. No CVSS, CWE, proof-of-concept status, or detailed vendor mitigation text is included here. Avoid assuming impact beyond reconnaissance support.
Mitigation direction
- Upgrade ownCloud Server to version 10.8.0 or later.
- Review the ownCloud security advisory and release notes for vendor guidance.
- Reduce unnecessary public share exposure where business use allows.
- Monitor public-share access logs for malformed URL patterns.
Validation and detection
- Inventory ownCloud Server versions and identify systems below 10.8.0.
- Confirm whether public share links are enabled on exposed instances.
- Review application logs for abnormal public-share URL requests.
- Verify remediation by confirming the deployed ownCloud version is 10.8.0 or later.
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-2021-35947 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
- 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-2021-35947/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.