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

Status: published. Published: 2026-03-27. Updated: 2026-11-08.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Wazuh / Wazuh (os_auth): ≥ 3.5.0; ≤ 4.3.10 (affected, semver). Source: CNA: VulnCheck; platforms: Linux

## Severity and prioritization

- CVSS 4.0: 5.3 (medium); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 3.5 (low); CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: 0.33% as of 2026-11-08; percentile 26.19%

- SSVC: exploitation poc; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-125

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/wazuh/wazuh/security/advisories/GHSA-grjq-p5fg-m24r (CNA: VulnCheck; vendor-advisory)

- https://www.vulncheck.com/advisories/heap-buffer-overflow-in-wazuh-authd (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2023-7340; retrieved 2026-11-08; source updated 2026-11-08

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2023-7340; retrieved 2026-11-08; source updated Not reported

Revision: e53c4dd1537146e19c404e058ae4a345b4005742130d76edf9ebefdd05966669

Canonical: https://y2.dev/cve/CVE-2023-7340

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