Is CVE-2023-4540 in the CISA KEV catalog?

No. CVE-2023-4540 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-4540?

CVE-2023-4540 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2023-4540?

CVE-2023-4540 has an EPSS score of 0.94% (57th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-4540?

Upgrade lua-http on debian 13 to 0.4-2 or later.

CVE & CISA-KEV Catalog

CVE-2023-4540

HIGH

7.5

CVSS v3

NVD

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.

CWE-755

How to fix

Remediation Available

lua-httpDebian

Fixed in:0.4-2CVE-2023-4540

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.94%probability of exploitation in 30 days

57thpercentile

Moderate risk: more likely to be exploited than 57% of all known CVEs.

References

Patch2

Other references2

Related Vulnerabilities

Other CWE-755 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-5638	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2020-7247	Critical	9.8	99%	KEV	Fix
CVE-2023-36933	High	7.5	72%	-	Fix
CVE-2018-0934	High	7.5	66%	-	Fix
CVE-2019-14287	High	8.8	64%	-	Fix
CVE-2019-12815	Critical	9.8	58%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-04-04.