CVE catalog
CVE-2021-42377
busybox: CVE-2021-42377
- Severity
- Medium · CVSS 6.4
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 3.62% · Oct 27, 2026
An attacker-controlled pointer free in Busybox's hush applet leads to denial of service and possible code execution when processing a crafted shell command, due to the shell mishandling the &&& string. This may be used for remote code execution under rare conditions of filtered command input.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | busybox | sid | 1:1.38.0-3 | fixed |
| Debian | busybox | forky | 1:1.38.0-3 | fixed |
| Debian | busybox | trixie | 1:1.37.0-6 | fixed |
| Debian | busybox | bookworm | 1:1.35.0-4+deb12u1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | busybox | source | sid | 1:1.35.0-1 | unimportant | Not reported | [999567] |
| Debian | busybox | source | forky | 1:1.35.0-1 | unimportant | Not reported | [999567] |
| Debian | busybox | source | trixie | 1:1.35.0-1 | unimportant | Not reported | [999567] |
| Debian | busybox | source | bookworm | 1:1.35.0-1 | unimportant | Not reported | [999567] |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [busybox]Fixed
Source package: [busybox]
Details (2)
1:1.35.0-4+deb12u1+b1· amd64 · bookwormFixed · Fixed:
1:1.35.0-1dsa · busybox · debian · bookworm; dsa · busybox · debian · 12
1:1.35.0-4+deb12u1+b1· arm64 · bookwormFixed · Fixed:
1:1.35.0-1dsa · busybox · debian · bookworm; dsa · busybox · debian · 12
- [busybox-static]Fixed
Source package: [busybox]
Details (2)
1:1.35.0-4+deb12u1+b1· amd64 · bookwormFixed · Fixed:
1:1.35.0-1dsa · busybox · debian · bookworm; dsa · busybox · debian · 12
1:1.35.0-4+deb12u1+b1· arm64 · bookwormFixed · Fixed:
1:1.35.0-1dsa · busybox · debian · bookworm; dsa · busybox · debian · 12
- [busybox-syslogd]Fixed
Source package: [busybox]
Details (2)
1:1.35.0-4+deb12u1· all · bookwormFixed · Fixed:
1:1.35.0-1dsa · busybox · debian · bookworm; dsa · busybox · debian · 12
1:1.35.0-4+deb12u1· all · bookwormFixed · Fixed:
1:1.35.0-1dsa · busybox · debian · bookworm; dsa · busybox · debian · 12
- [udhcpc]Fixed
Source package: [busybox]
Details (2)
1:1.35.0-4+deb12u1+b1· amd64 · bookwormFixed · Fixed:
1:1.35.0-1dsa · busybox · debian · bookworm; dsa · busybox · debian · 12
1:1.35.0-4+deb12u1+b1· arm64 · bookwormFixed · Fixed:
1:1.35.0-1dsa · busybox · debian · bookworm; dsa · busybox · debian · 12
- [udhcpd]Fixed
Source package: [busybox]
Details (2)
1:1.35.0-4+deb12u1+b1· amd64 · bookwormFixed · Fixed:
1:1.35.0-1dsa · busybox · debian · bookworm; dsa · busybox · debian · 12
1:1.35.0-4+deb12u1+b1· arm64 · bookwormFixed · Fixed:
1:1.35.0-1dsa · busybox · debian · bookworm; dsa · busybox · debian · 12
[Debian 13 (Trixie)]
- [busybox]Fixed
Source package: [busybox]
Details (2)
1:1.37.0-6+b8· amd64 · trixieFixed · Fixed:
1:1.35.0-1dsa · busybox · debian · 13
1:1.37.0-6+b8· arm64 · trixieFixed · Fixed:
1:1.35.0-1dsa · busybox · debian · 13
- [busybox-static]Fixed
Source package: [busybox]
Details (2)
1:1.37.0-6+b8· amd64 · trixieFixed · Fixed:
1:1.35.0-1dsa · busybox · debian · 13
1:1.37.0-6+b8· arm64 · trixieFixed · Fixed:
1:1.35.0-1dsa · busybox · debian · 13
- [busybox-syslogd]Fixed
Source package: [busybox]
Details (2)
1:1.37.0-6· all · trixieFixed · Fixed:
1:1.35.0-1dsa · busybox · debian · 13
1:1.37.0-6· all · trixieFixed · Fixed:
1:1.35.0-1dsa · busybox · debian · 13
- [udhcpc]Fixed
Source package: [busybox]
Details (2)
1:1.37.0-6· all · trixieFixed · Fixed:
1:1.35.0-1dsa · busybox · debian · 13
1:1.37.0-6· all · trixieFixed · Fixed:
1:1.35.0-1dsa · busybox · debian · 13
- [udhcpd]Fixed
Source package: [busybox]
Details (2)
1:1.37.0-6· all · trixieFixed · Fixed:
1:1.35.0-1dsa · busybox · debian · 13
1:1.37.0-6· all · trixieFixed · Fixed:
1:1.35.0-1dsa · busybox · debian · 13
Observed:
References
- [https://cert-portal.siemens.com/productcert/csaf/ssa-419740.json]
- [https://ftp.suse.com/pub/projects/security/csaf/suse-su-2022_0135-1.json]
- [https://osv.dev/vulnerability/ALPINE-CVE-2021-42377]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2021-42377]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2021-42377]
- [https://security-tracker.debian.org/tracker/CVE-2021-42377]
- [https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-42377.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2021/wid-sec-w-2022-2028.json]
[CERT-Bund public advisories] · [CISA cybersecurity advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]