Security readout for executives and security teams
Plain-English summary
WhiteBeam versions before 0.2.2 can let a local user bypass intended file write protections. The issue is timing-related: a file may be truncated before the permission check runs. Business impact is mainly unauthorized local file modification and possible service disruption, not remote takeover based on the provided sources.
Executive priority
Treat this as a moderate-priority local privilege boundary issue. It is not described as remotely exploitable, but it can undermine file write controls on affected hosts. Patch during the next normal security maintenance window, faster for shared or sensitive servers.
Technical view
CVE-2021-47688 is a CWE-696 ordering flaw in WhiteBeam 0.2.0 through 0.2.1 before 0.2.2. In OpenFileDescriptor, truncation can occur before VerifyCanWrite validates allow-list permission. CVSS 3.1 is 5.7 with local attack vector, low complexity, no privileges, no user interaction, changed scope, and low integrity and availability impact.
Likely exposure
Exposure is limited to systems running affected WhiteBeam versions where an attacker can obtain local access to the server. The provided affected data is narrow and does not identify downstream packages, managed services, or broader product integrations.
Exploitation context
The source bundle does not show CISA KEV listing or other evidence of active exploitation. The vulnerability requires local access, so risk increases on shared servers, developer systems, CI workers, or hosts where untrusted users can run code.
Researcher notes
Key behavior is authorization after side effect: truncation may happen before VerifyCanWrite. The CVE record cites WhiteBeam before 0.2.2 and PR 22. The bundle does not include exploit proof, active exploitation evidence, or detailed environmental prerequisites beyond local access.
Mitigation direction
- Upgrade WhiteBeam to version 0.2.2 or later.
- Review the GitHub advisory and vendor security policy for current guidance.
- Restrict local server access to trusted users and workloads.
- Prioritize hosts where WhiteBeam protects sensitive write paths.
- Monitor for unexpected truncation or modification of protected files.
Validation and detection
- Inventory all systems running WhiteBeam.
- Confirm installed WhiteBeam versions are not 0.2.0 or 0.2.1.
- Review configuration for allow-list protected write paths.
- Check whether untrusted users or jobs have local server access.
- Confirm remediation against the GitHub advisory and pull request.
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-696: Exact CWE lookup
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Open ATT&CK lookupCVE-2021-47688 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
- 5.7 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/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:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L2.52.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.7MediumVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L
Source materials
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.
Incorrect Behavior Order
Incorrect Behavior Order represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.