CVE-2023-7340 Wazuh authd service (os_auth) Heap-based Buffer Overflow

What is CVE-2023-7340?

CVE-2023-7340 is a medium-severity memory corruption vulnerability in Wazuh Wazuh, published on 27 Mar 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Wazuh authd contains a heap-buffer overflow vulnerability that allows attackers to cause memory corruption and malformed heap data by sending specially crafted input. Attackers can exploit this vulnerability to trigger a denial of service condition, resulting in low availability impact to the authentication daemon.

Weakness: CWE-125

Which versions are affected by CVE-2023-7340?

It affects 1 product.

Products include Wazuh Wazuh.

How do I fix CVE-2023-7340?

No fix has been published for CVE-2023-7340 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2023-7340 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-7340 exists.

Other vulnerabilities in Wazuh Wazuh

• CVE-2025-24016 Wazuh Server Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2024-32038 Wazuh Analysis Engine Event Decoder Heap-based Buffer Overflow Remote Code Execution Vulnerability Critical 9.8
• CVE-2021-44079 Command injection in n/a Critical 9.8
• CVE-2024-1243 Remote code execution and local privilege escalation in Wazuh Windows agent via NetNTLMv2 hash theft Critical 9.5
• CVE-2026-61800 Wazuh cluster worker file sync allows arbitrary file write under /var/ossec (incomplete fix for CVE-2026-30893) Critical 9.1

All Wazuh Wazuh vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-vp8c-mm4j-2g97.