CVE catalog
CVE-2021-28831
busybox: CVE-2021-28831
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 2.72% · Oct 27, 2026
decompress_gunzip.c in BusyBox through 1.32.1 mishandles the error bit on the huft_build result pointer, with a resultant invalid free or segmentation fault, via malformed gzip data.
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 |
| Alpine | busybox | 3.10 | 1.30.1-r5 | fixed |
| Alpine | busybox | 3.11 | 1.31.1-r10 | fixed |
| Alpine | busybox | 3.12 | 1.31.1-r20 | fixed |
| Alpine | busybox | 3.13 | 1.32.1-r4 | fixed |
| Alpine | busybox | 3.14 | 1.33.0-r5 | fixed |
| Alpine | busybox | 3.15 | 1.33.0-r5 | fixed |
| Alpine | busybox | 3.16 | 1.33.0-r5 | fixed |
| Alpine | busybox | 3.17 | 1.33.0-r5 | fixed |
| Alpine | busybox | 3.18 | 1.33.0-r5 | fixed |
| Alpine | busybox | 3.19 | 1.33.0-r5 | fixed |
| Alpine | busybox | 3.20 | 1.33.0-r5 | fixed |
| Alpine | busybox | 3.21 | 1.33.0-r5 | fixed |
| Alpine | busybox | 3.22 | 1.33.0-r5 | fixed |
| Alpine | busybox | 3.23 | 1.33.0-r5 | fixed |
| Alpine | busybox | 3.24 | 1.33.0-r5 | fixed |
| Ubuntu | busybox | pro | 1:1.22.0-19ubuntu2 | vulnerable |
| Ubuntu | busybox | pro | 1:1.27.2-1ubuntu3 | vulnerable |
| Ubuntu | busybox | pro | 1:1.27.2-1ubuntu4 | vulnerable |
| Ubuntu | busybox | pro | 1:1.27.2-2ubuntu2 | vulnerable |
| Ubuntu | busybox | pro | 1:1.27.2-2ubuntu3 | vulnerable |
| Ubuntu | busybox | pro | 1:1.27.2-2ubuntu3.1 | vulnerable |
| Ubuntu | busybox | pro | 1:1.27.2-2ubuntu3.2 | vulnerable |
| Ubuntu | busybox | pro | 1:1.27.2-2ubuntu3.3 | vulnerable |
| Ubuntu | busybox | pro | 1:1.27.2-2ubuntu3.4 | vulnerable |
| Ubuntu | busybox | pro | 1:1.27.2-2ubuntu3.4+esm1 | fixed |
| Ubuntu | busybox | pro | 1:1.22.0-15ubuntu1 | vulnerable |
| Ubuntu | busybox | pro | 1:1.22.0-15ubuntu1.4 | vulnerable |
| Ubuntu | busybox | pro | 1:1.22.0-15ubuntu1.4+esm1 | fixed |
| Ubuntu | busybox | 18.04 | 1:1.22.0-19ubuntu2 | vulnerable |
| Ubuntu | busybox | 18.04 | 1:1.27.2-1ubuntu3 | vulnerable |
| Ubuntu | busybox | 18.04 | 1:1.27.2-1ubuntu4 | vulnerable |
| Ubuntu | busybox | 18.04 | 1:1.27.2-2ubuntu2 | vulnerable |
| Ubuntu | busybox | 18.04 | 1:1.27.2-2ubuntu3 | vulnerable |
| Ubuntu | busybox | 18.04 | 1:1.27.2-2ubuntu3.1 | vulnerable |
| Ubuntu | busybox | 18.04 | 1:1.27.2-2ubuntu3.2 | vulnerable |
| Ubuntu | busybox | 18.04 | 1:1.27.2-2ubuntu3.3 | vulnerable |
| Ubuntu | busybox | 18.04 | 1:1.27.2-2ubuntu3.4 | fixed |
| Ubuntu | busybox | 20.04 | 1:1.30.1-4ubuntu4 | vulnerable |
| Ubuntu | busybox | 20.04 | 1:1.30.1-4ubuntu5 | vulnerable |
| Ubuntu | busybox | 20.04 | 1:1.30.1-4ubuntu6 | vulnerable |
| Ubuntu | busybox | 20.04 | 1:1.30.1-4ubuntu6.1 | vulnerable |
| Ubuntu | busybox | 20.04 | 1:1.30.1-4ubuntu6.2 | vulnerable |
| Ubuntu | busybox | 20.04 | 1:1.30.1-4ubuntu6.3 | vulnerable |
| Ubuntu | busybox | 20.04 | 1:1.30.1-4ubuntu6.4 | fixed |
| Ubuntu | busybox | pro | 1:1.22.0-15ubuntu1 | vulnerable |
| Ubuntu | busybox | pro | 1:1.22.0-15ubuntu1.4 | vulnerable |
| Ubuntu | busybox | pro | 1:1.22.0-15ubuntu1.4+esm1 | fixed |
| Ubuntu | busybox | 18.04 | 1:1.22.0-19ubuntu2 | vulnerable |
| Ubuntu | busybox | 18.04 | 1:1.27.2-1ubuntu3 | vulnerable |
| Ubuntu | busybox | 18.04 | 1:1.27.2-1ubuntu4 | vulnerable |
| Ubuntu | busybox | 18.04 | 1:1.27.2-2ubuntu2 | vulnerable |
| Ubuntu | busybox | 18.04 | 1:1.27.2-2ubuntu3 | vulnerable |
| Ubuntu | busybox | 18.04 | 1:1.27.2-2ubuntu3.1 | vulnerable |
| Ubuntu | busybox | 18.04 | 1:1.27.2-2ubuntu3.2 | vulnerable |
| Ubuntu | busybox | 18.04 | 1:1.27.2-2ubuntu3.3 | vulnerable |
| Ubuntu | busybox | 18.04 | 1:1.27.2-2ubuntu3.4 | fixed |
| Ubuntu | busybox | 20.04 | 1:1.30.1-4ubuntu4 | vulnerable |
| Ubuntu | busybox | 20.04 | 1:1.30.1-4ubuntu5 | vulnerable |
| Ubuntu | busybox | 20.04 | 1:1.30.1-4ubuntu6 | vulnerable |
| Ubuntu | busybox | 20.04 | 1:1.30.1-4ubuntu6.1 | vulnerable |
| Ubuntu | busybox | 20.04 | 1:1.30.1-4ubuntu6.2 | vulnerable |
| Ubuntu | busybox | 20.04 | 1:1.30.1-4ubuntu6.3 | vulnerable |
| Ubuntu | busybox | 20.04 | 1:1.30.1-4ubuntu6.4 | fixed |
| Ubuntu | busybox | 22.04 | 1:1.30.1-6ubuntu3 | vulnerable |
| Ubuntu | busybox | 22.04 | 1:1.30.1-7ubuntu1 | vulnerable |
| Ubuntu | busybox | 22.04 | 1:1.30.1-7ubuntu2 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | busybox | source | sid | 1:1.35.0-1 | not yet assigned | Not reported | [985674] |
| Debian | busybox | source | forky | 1:1.35.0-1 | not yet assigned | Not reported | [985674] |
| Debian | busybox | source | trixie | 1:1.35.0-1 | not yet assigned | Not reported | [985674] |
| Debian | busybox | source | bookworm | 1:1.35.0-1 | not yet assigned | Not reported | [985674] |
| Alpine | busybox | apk | 3.10 | 1.30.1-r5 | Not reported | ALPINE-CVE-2021-28831 | Not reported |
| Alpine | busybox | apk | 3.11 | 1.31.1-r10 | Not reported | ALPINE-CVE-2021-28831 | Not reported |
| Alpine | busybox | apk | 3.12 | 1.31.1-r20 | Not reported | ALPINE-CVE-2021-28831 | Not reported |
| Alpine | busybox | apk | 3.13 | 1.32.1-r4 | Not reported | ALPINE-CVE-2021-28831 | Not reported |
| Alpine | busybox | apk | 3.14 | 1.33.0-r5 | Not reported | ALPINE-CVE-2021-28831 | Not reported |
| Alpine | busybox | apk | 3.15 | 1.33.0-r5 | Not reported | ALPINE-CVE-2021-28831 | Not reported |
| Alpine | busybox | apk | 3.16 | 1.33.0-r5 | Not reported | ALPINE-CVE-2021-28831 | Not reported |
| Alpine | busybox | apk | 3.17 | 1.33.0-r5 | Not reported | ALPINE-CVE-2021-28831 | Not reported |
| Alpine | busybox | apk | 3.18 | 1.33.0-r5 | Not reported | ALPINE-CVE-2021-28831 | Not reported |
| Alpine | busybox | apk | 3.19 | 1.33.0-r5 | Not reported | ALPINE-CVE-2021-28831 | Not reported |
| Alpine | busybox | apk | 3.20 | 1.33.0-r5 | Not reported | ALPINE-CVE-2021-28831 | Not reported |
| Alpine | busybox | apk | 3.21 | 1.33.0-r5 | Not reported | ALPINE-CVE-2021-28831 | Not reported |
| Alpine | busybox | apk | 3.22 | 1.33.0-r5 | Not reported | ALPINE-CVE-2021-28831 | Not reported |
| Alpine | busybox | apk | 3.23 | 1.33.0-r5 | Not reported | ALPINE-CVE-2021-28831 | Not reported |
| Alpine | busybox | apk | 3.24 | 1.33.0-r5 | Not reported | ALPINE-CVE-2021-28831 | Not reported |
| Ubuntu | busybox | deb | pro | 1:1.27.2-2ubuntu3.4+esm1 | Not reported | USN-6335-1 | Not reported |
| Ubuntu | busybox | deb | pro | 1:1.22.0-15ubuntu1.4+esm1 | Not reported | USN-5179-2 | Not reported |
| Ubuntu | busybox | deb | 18.04 | 1:1.27.2-2ubuntu3.4 | Not reported | USN-5179-1 | Not reported |
| Ubuntu | busybox | deb | 20.04 | 1:1.30.1-4ubuntu6.4 | Not reported | USN-5179-1 | Not reported |
| Ubuntu | busybox | deb | pro | 1:1.22.0-15ubuntu1.4+esm1 | Not reported | UBUNTU-CVE-2021-28831 | Not reported |
| Ubuntu | busybox | deb | 18.04 | 1:1.27.2-2ubuntu3.4 | Not reported | UBUNTU-CVE-2021-28831 | Not reported |
| Ubuntu | busybox | deb | 20.04 | 1:1.30.1-4ubuntu6.4 | Not reported | UBUNTU-CVE-2021-28831 | Not reported |
| Ubuntu | busybox | deb | 22.04 | 1:1.30.1-7ubuntu2 | Not reported | UBUNTU-CVE-2021-28831 | Not reported |
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-831302.json]
- [https://ftp.suse.com/pub/projects/security/csaf/suse-su-2021_3531-1.json]
- [https://osv.dev/vulnerability/ALPINE-CVE-2021-28831]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2021-28831]
- [https://osv.dev/vulnerability/DLA-2614-1]
- [https://osv.dev/vulnerability/DLA-4019-1]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2021-28831]
- [https://osv.dev/vulnerability/USN-5179-1]
- [https://osv.dev/vulnerability/USN-5179-2]
- [https://osv.dev/vulnerability/USN-6335-1]
- [https://security-tracker.debian.org/tracker/CVE-2021-28831]
- [https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-28831.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2023/wid-sec-w-2023-1432.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]