What’s Vulnerable › Vulnerabilities

CVE-2023-4491: Easy Address Book Web Server Buffer overflow vulnerability

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-10-04 · updated 2026-06-17
• Weakness: CWE-119

Description

Buffer overflow vulnerability in Easy Address Book Web Server 1.6 version. The exploitation of this vulnerability could allow an attacker to send a very long username string to /searchbook.ghp, asking for the name via a POST request, resulting in arbitrary code execution on the remote machine.

Affected products

• EFS Software Easy Address Book Web Server: 1.6

References

• https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-efs-software-products
• https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-efs-software-products

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