CVE-2023-4540

Name: CVE-2023-4540
Creator: NVD / NIST
Published: 2023-09-05T08:15:40.017+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.94%

Last modified Jun 17, 2026

CVE-2023-4540 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Improper Handling of Exceptional Conditions vulnerability in Daurnimator lua-http library allows Excessive Allocation and a denial of service (DoS) attack to be executed by sending a properly crafted request to the server. Such a request causes the program to enter an infinite loop. EPSS estimates a 0.94% chance of exploitation in the next 30 days.

Description

Improper Handling of Exceptional Conditions vulnerability in Daurnimator lua-http library allows Excessive Allocation and a denial of service (DoS) attack to be executed by sending a properly crafted request to the server. Such a request causes the program to enter an infinite loop. This issue affects lua-http: all versions before commit ddab283.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.94%

56.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Daurnimator	Lua-Http	0.4

References

https://cert.pl/en/posts/2023/09/CVE-2023-4540/
https://cert.pl/posts/2023/09/CVE-2023-4540/Patch, Third Party Advisory
https://github.com/daurnimator/lua-http/commit/ddab2835c583d45dec62680ca8d3cbde55e0bae6Patch
https://cert.pl/posts/2023/09/CVE-2023-4540/Patch, Third Party Advisory
https://github.com/daurnimator/lua-http/commit/ddab2835c583d45dec62680ca8d3cbde55e0bae6Patch
https://https://cert.pl/en/posts/2023/09/CVE-2023-4540/

Timeline

Published: Sep 5, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-4540?

How severe is CVE-2023-4540?

CVE-2023-4540 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.94% probability of exploitation in the next 30 days.

How do I fix CVE-2023-4540?

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-2023-4540?

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

Scan your code now

Source: NVD / NIST