CVE-2023-4491

Name: CVE-2023-4491
Creator: NVD / NIST
Published: 2023-10-04T13:15:25.823+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 0.90%

Last modified Jun 17, 2026

CVE-2023-4491 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 0.90% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.90%

55.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Easy Address Book Web Server Project	Easy Address Book Web Server	1.6

References

https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-efs-software-productsThird Party Advisory
https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-efs-software-productsThird Party Advisory

Timeline

Published: Oct 4, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-4491?

How severe is CVE-2023-4491?

CVE-2023-4491 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.90% probability of exploitation in the next 30 days.

How do I fix CVE-2023-4491?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-4491?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST