CVE-2023-40518
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.
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
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 List No score
LiteSpeed OpenLiteSpeed before 1.7.18 does not strictly validate HTTP request headers.
- Record
CVE-2023-40518- Updated
- 2026-11-02
EUVDEUVD-2023-45089 No 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
OSV No score
LiteSpeed OpenLiteSpeed before 1.7.18 does not strictly validate HTTP request headers.
- Record
CVE-2023-40518- Updated
- 2026-11-02
Affected products
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.
In short
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.