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CVE-2021-43519

MEDIUM
5.5
CVSS Score
Published: November 9, 2021 at 12:26 PM UTC
Updated: June 17, 2026 at 04:11 AM UTC
2 products affected across 2 vendorsFedoraLua

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Severity
MEDIUM5.5
Exploit prediction
EPSS 1%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Fedora· Fedora Projectrpm
95%
35
Lua· Lua
95%
5.1.0 ≤ v < 5.3.55.4.0 ≤ v < 5.4.4
Affected range stops below 5.3.5, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.4.4, so it looks safe — our inference, not a vendor statement

References (4)

x_refsource_MISCExploitMailing ListVendor Advisory
Source: [email protected]
http://lua-users.org/lists/lua-l/2021-10/msg00123.html
x_refsource_MISCPatchVendor Advisory
Source: [email protected]
http://lua-users.org/lists/lua-l/2021-11/msg00015.html
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/C7XHFYHGSZKL53VCLSJSAJ6VMFGAIXKO/
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/P3EMGAQ5Y6GXJLY4K5DUOOEQT4MZ4J4F/

CVSS

5.5MEDIUM[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-674

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