LiteSpeed OpenLiteSpeed before 1.7.18 does not strictly validate HTTP request headers.
Priority MEDIUM 40Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
LiteSpeed OpenLiteSpeed before 1.7.18 does not strictly validate HTTP request headers.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00652 51st percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:litespeedtech:openlitespeed:*:*:*:*:*:*:*:* | before 1.7.18 | Vulnerable | litespeedtech |
- cpe:2.3:a:litespeedtech:openlitespeed:*:*:*:*:*:*:*:* Versions before 1.7.18 Vulnerable ·litespeedtech
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2023-40518
- 2026-10-03 Alias added: GHSA-qg79-g97j-8qg5
- 2026-10-14 EPSS moved to the 50th–90th percentile
References
More litespeedtech Openlitespeed vulnerabilities
- TI-2022-00030 Authenticated Remote Code Execution in OpenLiteSpeed Web Server CVSS 3.1HIGH 8.8
- TI-2020-04489 The WebAdmin Console in OpenLiteSpeed before v1.6.5 does not strictly check request URLs… CVSS 3.1CRITICAL 9.8
- TI-2021-08426 Privilege Escalation in LiteSpeed Technologies OpenLiteSpeed web server version 1.7.8… CVSS 3.1HIGH 8.8
- TI-2026-23945 OS command injection in LiteSpeed Technologies OpenLiteSpeed CVSS 4.0HIGH 8.6
- TI-2022-00031 Privilege Escalation in OpenLiteSpeed Web Server CVSS 3.1HIGH 8.8
- TI-2015-03304 Use-after-free vulnerability in Open Litespeed before 1.3.10. CVSS 3.1HIGH 7.5
Sources
- CVE-2023-40518 · CVE Program
- CVE-2023-40518 · NVD
- FIRST EPSS
- GHSA-qg79-g97j-8qg5 · GitHub Advisory Database · CC BY 4.0
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