CVE-2021-43519
MEDIUMCVSS 5.5/10EPSS 1.14%
Last modified
CVE-2021-43519 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. Stack overflow in lua_resume of ldo.c in Lua Interpreter 5.1.0~5.4.4 allows attackers to perform a Denial of Service via a crafted script file.. EPSS estimates a 1.14% chance of exploitation in the next 30 days.
Description
Stack overflow in lua_resume of ldo.c in Lua Interpreter 5.1.0~5.4.4 allows attackers to perform a Denial of Service via a crafted script file.
Metrics
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Lua | Lua | >= 5.1.0, < 5.3.5 |
| Lua | Lua | >= 5.4.0, < 5.4.4 |
| Fedoraproject | Fedora | 35 |
References
- http://lua-users.org/lists/lua-l/2021-10/msg00123.htmlExploit, Mailing List, Vendor Advisory
- http://lua-users.org/lists/lua-l/2021-11/msg00015.htmlPatch, Vendor Advisory
- http://lua-users.org/lists/lua-l/2021-10/msg00123.htmlExploit, Mailing List, Vendor Advisory
- http://lua-users.org/lists/lua-l/2021-11/msg00015.htmlPatch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-43519?
Stack overflow in lua_resume of ldo.c in Lua Interpreter 5.1.0~5.4.4 allows attackers to perform a Denial of Service via a crafted script file.
How severe is CVE-2021-43519?
CVE-2021-43519 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 1.14% probability of exploitation in the next 30 days.
How do I fix CVE-2021-43519?
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-2021-43519?
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Scan your code nowSource: NVD / NIST