CVE-2023-40518
LiteSpeed OpenLiteSpeed before 1.7.18 does not strictly validate HTTP request headers.
CVE-2023-40518 is a high vulnerability (CVSS 7.5) in Litespeedtech Openlitespeed, published August 14, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.65%, the 51st percentile. No source names a fixed version.
- Severity
- 7.5 HighCVSS 3.1, NVD
- Exploit chance
- 0.65%EPSS, 51st percentile
- Exploitation
- None knownNot on CISA’s or ENISA’s lists
- Fixed in
- No fix listedNo source names one
Description
LiteSpeed OpenLiteSpeed before 1.7.18 does not strictly validate HTTP request headers.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- High
- Availability
- None
Exploit likelihood
Affected products
What each source reports
NVD Score used
LiteSpeed OpenLiteSpeed before 1.7.18 does not strictly validate HTTP request headers.
- Record
CVE-2023-40518- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Updated
- 2026-11-02
CVE ListNo score
LiteSpeed OpenLiteSpeed before 1.7.18 does not strictly validate HTTP request headers.
- Record
CVE-2023-40518- Updated
- 2026-11-02
EUVDEUVD-2023-45089No score
LiteSpeed OpenLiteSpeed before 1.7.18 does not strictly validate HTTP request headers.
- Record
EUVD-2023-45089- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-qg79-g97j-8qg5
LiteSpeed OpenLiteSpeed before 1.7.18 does not strictly validate HTTP request headers.
LiteSpeed OpenLiteSpeed before 1.7.18 does not strictly validate HTTP request headers.
- Record
GHSA-qg79-g97j-8qg5- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Updated
- 2026-11-02
OSVNo score
LiteSpeed OpenLiteSpeed before 1.7.18 does not strictly validate HTTP request headers.
- Record
CVE-2023-40518- Updated
- 2026-11-02
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.