Security readout for executives and security teams
Plain-English summary
CVE-2021-41821 affects Wazuh Manager through version 4.1.5. An authenticated Wazuh agent can send a crafted message that may crash or disrupt the manager, creating a denial-of-service risk for security monitoring operations.
Executive priority
Treat as a targeted operational resilience issue. It is not shown as actively exploited, but a successful attack could interrupt security telemetry and alerting where Wazuh is central to monitoring.
Technical view
The CVE describes a remote integer underflow in Wazuh Manager through 4.1.5. Exploitation requires an authenticated agent sending a crafted message to the manager. Public scoring, CWE mapping, and detailed impact metrics are not provided in the source bundle.
Likely exposure
Organizations running Wazuh Manager 4.1.5 or earlier are potentially exposed, especially where agent enrollment or agent identity trust is weak. Systems not using Wazuh Manager are not indicated as affected by the provided sources.
Exploitation context
The source bundle does not show active exploitation or CISA KEV listing. The key limiting factor is that the crafted message must come from an authenticated agent, reducing internet-wide exposure but preserving insider, compromised-agent, or mismanaged-agent risk.
Researcher notes
Evidence is limited to the CVE description and referenced Wazuh materials. No CVSS vector, CWE, proof of exploitation, or detailed patch note text is included in the bundle. Avoid assuming exploitability beyond authenticated-agent message delivery.
Mitigation direction
- Inventory Wazuh Manager versions and flag 4.1.5 or earlier.
- Review Wazuh 4.2.0 release notes and vendor upgrade guidance.
- Restrict and monitor agent enrollment and authentication paths.
- Investigate unexpected agent behavior or manager instability.
- Check vendor advisories before applying compensating controls.
Validation and detection
- Confirm Wazuh Manager version on each deployment.
- Review agent inventory for unknown or stale authenticated agents.
- Check manager logs for crashes or malformed agent message errors.
- Verify upgrade status against Wazuh release documentation.
- Confirm no public route exposes manager services unnecessarily.
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-2021-41821 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://documentation.wazuh.com/current/release-notes/release_4_2_0.htmlCVE reference · x_refsource_MISC
- https://github.com/wazuh/wazuh/issues/9201CVE 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.