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Vulnerability record · CVE-2021-42374 · published 15 November 2021

CVE-2021-42374: Busybox out-of-bounds read vulnerability

Busybox · Busybox

An out-of-bounds heap read in Busybox's unlzma applet leads to information leak and denial of service when crafted LZMA-compressed input is decompressed. This can be triggered by any applet/format that

5.3 CVSS 3.1 Medium EPSS 0.62% · top 52.2% CWE-125 · Out-of-bounds read
5.3CVSS 3.1 base score, v2 3.3
0.62%EPSS exploitation probability, 30 days
NoNot in CISA KEV
12Affected product versions listed by NVD
11References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

An out-of-bounds heap read in Busybox's unlzma applet leads to information leak and denial of service when crafted LZMA-compressed input is decompressed. This can be triggered by any applet/format that

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H

Affected products

12 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://claroty.com/team82/research/unboxing-busybox-14-vulnerabilities-uncovered-by-claroty-jfrog
https://jfrog.com/blog/unboxing-busybox-14-new-vulnerabilities-uncovered-by-claroty-and-jfrog/ ExploitThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6T2TURBYYJGBMQTTN2DSOAI
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQXGOGWBIYWOIVXJVRKHZR3
https://security.netapp.com/advisory/ntap-20211223-0002/ Third Party Advisory
https://claroty.com/team82/research/unboxing-busybox-14-vulnerabilities-uncovered-by-claroty-jfrog
https://jfrog.com/blog/unboxing-busybox-14-new-vulnerabilities-uncovered-by-claroty-and-jfrog/ ExploitThird Party Advisory
https://lists.debian.org/debian-lts-announce/2025/01/msg00012.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6T2TURBYYJGBMQTTN2DSOAI
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQXGOGWBIYWOIVXJVRKHZR3
https://security.netapp.com/advisory/ntap-20211223-0002/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2021-42374), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.