Medium severity · published Sep 29, 2021
CVE-2021-41821
Wazuh Manager in Wazuh through 4.1.5 is affected by a remote Integer Underflow vulnerability that might lead to denial of service
6.5
CVSS
1.1%
EPSS
No
On KEV
Description
Wazuh Manager in Wazuh through 4.1.5 is affected by a remote Integer Underflow vulnerability that might lead to denial of service. A crafted message must be sent from an authenticated agent to the manager.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.1% · higher than 66% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WA
Wazuh · Wazuh
through 4.1.5 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-41821
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-41821
Release Notes
https://documentation.wazuh.com/current/release-notes/release_4_2_0.html
Exploit
https://github.com/wazuh/wazuh/issues/9201
More from Wazuh
9.9
CVE-2025-24016
Remote code execution in Wazuh server
9.9
CVE-2026-30893
Wazuh cluster sync path traversal in decompress_files() enables arbitrary file write and code execution from authenticated cluster peer
9.8
CVE-2024-32038
Wazuh is a free and open source platform used for threat prevention, detection, and response
9.8
CVE-2021-44079
In the wazuh-slack active response script in Wazuh 4.2.x before 4.2.5, untrusted user agents are passed to a curl command line, potentially resulting in remote code execution
9.3
CVE-2026-67308
Wazuh GitHub Actions Shell Injection via Fork Pull Request