CVE-2019-6706
HIGHCVSS 7.5/10EPSS 17.22%
Last modified
CVE-2019-6706 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Lua 5.3.5 has a use-after-free in lua_upvaluejoin in lapi.c. For example, a crash outcome might be achieved by an attacker who is able to trigger a debug.upvaluejoin call in which the arguments have certain relationships.. EPSS estimates a 17.22% chance of exploitation in the next 30 days.
Description
Lua 5.3.5 has a use-after-free in lua_upvaluejoin in lapi.c. For example, a crash outcome might be achieved by an attacker who is able to trigger a debug.upvaluejoin call in which the arguments have certain relationships.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Lua | Lua | 5.3.5 |
| Canonical | Ubuntu Linux | 16.04 |
| Canonical | Ubuntu Linux | 18.04 |
| Canonical | Ubuntu Linux | 18.10 |
References
- http://packetstormsecurity.com/files/151335/Lua-5.3.5-Use-After-Free.htmlExploit, Third Party Advisory, VDB Entry
- https://access.redhat.com/security/cve/cve-2019-6706Third Party Advisory
- https://github.com/Lua-Project/cve-analysis/blob/a43c9ccd00274b31fa2f24c6c8f20ce36655682d/CVE-2019-6706.pdfExploit, Third Party Advisory
- https://github.com/lua/lua/commit/89aee84cbc9224f638f3b7951b306d2ee8ecb71ePatch, Third Party Advisory
- http://packetstormsecurity.com/files/151335/Lua-5.3.5-Use-After-Free.htmlExploit, Third Party Advisory, VDB Entry
- https://access.redhat.com/security/cve/cve-2019-6706Third Party Advisory
- https://github.com/Lua-Project/cve-analysis/blob/a43c9ccd00274b31fa2f24c6c8f20ce36655682d/CVE-2019-6706.pdfExploit, Third Party Advisory
- https://github.com/lua/lua/commit/89aee84cbc9224f638f3b7951b306d2ee8ecb71ePatch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2019-6706?
Lua 5.3.5 has a use-after-free in lua_upvaluejoin in lapi.c. For example, a crash outcome might be achieved by an attacker who is able to trigger a debug.upvaluejoin call in which the arguments have certain relationships.
How severe is CVE-2019-6706?
CVE-2019-6706 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 17.22% probability of exploitation in the next 30 days.
How do I fix CVE-2019-6706?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2019-6706?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST