# CVE-2020-24370: Integer overflow in n/a > An integer overflow in Lua's debug functions causes a segmentation fault, leading to denial of service. - **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 17 Aug 2020 - **Updated:** 4 Aug 2024 - **Also known as:** ALSA-2021:4510, AZL-41149, BIT-lua-2020-24370, DEBIAN-CVE-2020-24370, DLA-2381-1, GHSA-gfr4-c37g-mm3v, JLSEC-2026-555, MGASA-2020-0362, OESA-2024-2169, OESA-2025-1278, OESA-2025-1279, OESA-2025-1280, OESA-2025-1281, OESA-2025-1301, RHSA-2021:4510, RLSA-2021:4510 ## What is CVE-2020-24370? CVE-2020-24370 is a medium-severity vulnerability in Debian Debian Linux, published on 17 Aug 2020. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description ldebug.c in Lua 5.4.0 allows a negation overflow and segmentation fault in getlocal and setlocal, as demonstrated by getlocal(3,2^31). Weakness: CWE-191 (Integer Underflow (Wrap or Wraparound)) ## Which versions are affected by CVE-2020-24370? 1 open source package ship an affected version, including lua. It affects 3 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `lua` | Bitnami | From 5.2.0 | 5.2.4, 5.3.6, 5.4.1 | | `lua` | AlmaLinux:8 | All versions | 5.3.4-12.el8 | | `lua-devel` | AlmaLinux:8 | All versions | 5.3.4-12.el8 | | `lua-libs` | AlmaLinux:8 | All versions | 5.3.4-12.el8 | | `lua` | Red Hat:enterprise_linux:8::appstream | All versions | 0:5.3.4-12.el8 | | `lua-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 0:5.3.4-12.el8 | | `lua-debugsource` | Red Hat:enterprise_linux:8::appstream | All versions | 0:5.3.4-12.el8 | | `lua-libs-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 0:5.3.4-12.el8 | | `lua` | Red Hat:enterprise_linux:8::baseos | All versions | 0:5.3.4-12.el8 | | `lua-debuginfo` | Red Hat:enterprise_linux:8::baseos | All versions | 0:5.3.4-12.el8 | | `lua-debugsource` | Red Hat:enterprise_linux:8::baseos | All versions | 0:5.3.4-12.el8 | | `lua-libs` | Red Hat:enterprise_linux:8::baseos | All versions | 0:5.3.4-12.el8 | | `lua-libs-debuginfo` | Red Hat:enterprise_linux:8::baseos | All versions | 0:5.3.4-12.el8 | | `lua` | Red Hat:enterprise_linux:8::crb | All versions | 0:5.3.4-12.el8 | | `lua-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 0:5.3.4-12.el8 | | `lua-debugsource` | Red Hat:enterprise_linux:8::crb | All versions | 0:5.3.4-12.el8 | | `lua-devel` | Red Hat:enterprise_linux:8::crb | All versions | 0:5.3.4-12.el8 | | `lua-libs-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 0:5.3.4-12.el8 | | `lua` | Rocky Linux:8 | All versions | 0:5.3.4-12.el8 | Products: Debian Debian Linux, Fedoraproject Fedora, Lua Lua. ## How do I fix CVE-2020-24370? Upgrade lua to a fixed version for your release line: 5.2.4, 5.3.6 or 5.4.1. ## Is CVE-2020-24370 being exploited? There is no known exploitation of CVE-2020-24370 in the wild and no public exploit code. Public exploit code: - https://github.com/RenukaSelvar/lua_CVE-2020-24370 (github_poc): https://github.com/RenukaSelvar/lua_CVE-2020-24370 - https://github.com/RenukaSelvar/lua_CVE-2020-24370_AfterPatch (github_poc): https://github.com/RenukaSelvar/lua_CVE-2020-24370_AfterPatch ## Other vulnerabilities in Debian Debian Linux - [CVE-2015-3306](https://insights.sbomify.com/CVE-2015-3306/): ProFTPD Improper Access Control (critical 10.0, exploited in the wild) - [CVE-2025-49113](https://insights.sbomify.com/CVE-2025-49113/): RoundCube Webmail Deserialization of Untrusted Data (critical 9.9, exploited in the wild) - [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild) - [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild) - [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2020-24370 and fix it if it is affected. What it is: CVE-2020-24370 is a medium-severity vulnerability in Debian Debian Linux, published on 17 Aug 2020. An attacker can exploit it over the internet without logging in, with no action from the victim. Exploitation: There is no known exploitation of CVE-2020-24370 in the wild and no public exploit code. Affected packages and fixed versions: - lua (Bitnami): affected from 5.2.0; fixed in 5.2.4, 5.3.6, 5.4.1 Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2020-24370/ (Markdown: https://insights.sbomify.com/CVE-2020-24370/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2020-24370 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-24370 - OSV: https://osv.dev/vulnerability/CVE-2020-24370 --- From sbomify Insights: https://insights.sbomify.com/CVE-2020-24370/ Summaries are generated and may contain mistakes; the official description above is the record.