CVE-2023-4540 — Improper Handling of Exceptional Conditions vulnerability in Daurnimator lua-htt

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 lo

01What is this vulnerability?

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.

02Affected products

Vendor	Product	Versions
Daurnimator	lua	http — 0

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-09-05T07:46:45.194Z
• Last modified: 2025-04-04T18:33:32.557Z

09References

• github.com — https://github.com/daurnimator/lua-http/commit/ddab2835c583d45dec62680ca8d3cbde5…
• cert.pl — https://cert.pl/posts/2023/09/CVE-2023-4540/
• cert.pl — https://cert.pl/en/posts/2023/09/CVE-2023-4540/