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Vulnerability record · CVE-2023-40518 · published 14 August 2023

CVE-2023-40518: Litespeedtech openlitespeed vulnerability

Litespeedtech · Openlitespeed

LiteSpeed OpenLiteSpeed before 1.7.18 does not strictly validate HTTP request headers.

7.5 CVSS 3.1 High EPSS 0.65% · top 50.8%
7.5CVSS 3.1 base score
0.65%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

LiteSpeed OpenLiteSpeed before 1.7.18 does not strictly validate HTTP request headers.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://openlitespeed.org/release-log/version-1-7-x/ Release Notes
https://www.litespeedtech.com/products/litespeed-web-server/release-log Release Notes
https://openlitespeed.org/release-log/version-1-7-x/ Release Notes
https://www.litespeedtech.com/products/litespeed-web-server/release-log Release Notes

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2020-5519Litespeedtech openlitespeed improper input validation vulnerabilityThe WebAdmin Console in OpenLiteSpeed before v1.6.5 does not strictly check request URLs, as demonstrated by the "Server Configuration > External App…EPSS 1.2%8.8CVE-2022-0073Litespeedtech openlitespeed improper input validation vulnerabilityImproper Input Validation vulnerability in LiteSpeed Technologies OpenLiteSpeed Web Server and LiteSpeed Web Server dashboards allows Command Injecti…EPSS 8.8%8.8CVE-2022-0074Litespeedtech openlitespeed untrusted search path vulnerabilityUntrusted Search Path vulnerability in LiteSpeed Technologies OpenLiteSpeed Web Server and LiteSpeed Web Server Container allows Privilege Escalation…EPSS 1.2%8.8CVE-2021-26758Litespeedtech openlitespeed improper privilege management vulnerabilityPrivilege Escalation in LiteSpeed Technologies OpenLiteSpeed web server version 1.7.8 allows attackers to gain root terminal access and execute comma…EPSS 2.7%8.6CVE-2026-31386Litespeedtech litespeed web server os command injection vulnerabilityOpenLiteSpeed and LSWS Enterprise provided by LiteSpeed Technologies contain an OS command injection vulnerability. An arbitrary OS command may be ex…EPSS 2.1%7.5CVE-2025-54939Litespeedtech litespeed web adc allocation without limits vulnerabilityLiteSpeed QUIC (LSQUIC) Library before 4.3.1 has an lsquic_engine_packet_in memory leak.EPSS 0.81%7.5CVE-2015-3890Litespeedtech openlitespeed use after free vulnerabilityUse-after-free vulnerability in Open Litespeed before 1.3.10.EPSS 1.1%6.7CVE-2018-19792Litespeedtech openlitespeed memory buffer overflow vulnerabilityThe server in LiteSpeed OpenLiteSpeed before 1.5.0 RC6 allows local users to cause a denial of service (buffer overflow) or possibly have unspecified…EPSS 0.43%

Source: NIST National Vulnerability Database (record CVE-2023-40518), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.