CVE-2021-41821 Integer overflow in n/a
An authenticated agent can cause a denial of service in Wazuh Manager via a crafted message triggering an integer underflow.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-41821?
CVE-2021-41821 is a medium-severity vulnerability in Wazuh Wazuh, published on 29 Sep 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-191
Which versions are affected by CVE-2021-41821?
It affects 1 product.
Products include Wazuh Wazuh.
How do I fix CVE-2021-41821?
No fix has been published for CVE-2021-41821 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-41821 being exploited?
There is no known exploitation of CVE-2021-41821 in the wild and no public exploit code.
Other vulnerabilities in Wazuh Wazuh
- CVE-2025-24016 Wazuh Server Deserialization of Untrusted Data
- CVE-2024-32038 Wazuh Analysis Engine Event Decoder Heap-based Buffer Overflow Remote Code Execution Vulnerability
- CVE-2021-44079 Command injection in n/a
- CVE-2024-1243 Remote code execution and local privilege escalation in Wazuh Windows agent via NetNTLMv2 hash theft
- CVE-2026-61800 Wazuh cluster worker file sync allows arbitrary file write under /var/ossec (incomplete fix for CVE-2026-30893)
Sources
Also known as GHSA-9p24-grw8-6g35.