CVE catalog
CVE-2021-23240
sudo: CVE-2021-23240
- Severity
- High · CVSS 7.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 1.08% · Oct 25, 2026
selinux_edit_copy_tfiles in sudoedit in Sudo before 1.9.5 allows a local unprivileged user to gain file ownership and escalate privileges by replacing a temporary file with a symlink to an arbitrary file target. This affects SELinux RBAC support in permissive mode. Machines without SELinux are not vulnerable.
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 | sudo | sid | 1.9.17p2-9 | fixed |
| Debian | sudo | forky | 1.9.17p2-9 | fixed |
| Debian | sudo | trixie | 1.9.16p2-3+deb13u2 | fixed |
| Debian | sudo | bookworm | 1.9.13p3-1+deb12u4 | fixed |
| Debian | sudo | bookworm-security | 1.9.13p3-1+deb12u2 | fixed |
| Alpine | sudo | 3.10 | 1.9.5p2-r0 | fixed |
| Alpine | sudo | 3.11 | 1.9.5p2-r0 | fixed |
| Alpine | sudo | 3.12 | 1.9.5-r0 | fixed |
| Alpine | sudo | 3.13 | 1.9.5-r0 | fixed |
| Alpine | sudo | 3.14 | 1.9.5-r0 | fixed |
| Alpine | sudo | 3.15 | 1.9.5-r0 | fixed |
| Ubuntu | sudo | pro | 1.8.27-1ubuntu4 | vulnerable |
| Ubuntu | sudo | pro | 1.8.29-1ubuntu1 | vulnerable |
| Ubuntu | sudo | pro | 1.8.31-1ubuntu1 | vulnerable |
| Ubuntu | sudo | pro | 1.8.31-1ubuntu1.1 | vulnerable |
| Ubuntu | sudo | pro | 1.8.31-1ubuntu1.2 | vulnerable |
| Ubuntu | sudo | pro | 1.8.31-1ubuntu1.4 | vulnerable |
| Ubuntu | sudo | pro | 1.8.31-1ubuntu1.5 | vulnerable |
| Ubuntu | sudo | pro | 1.8.31-1ubuntu1.5+esm1 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | sudo | source | sid | 1.9.5-1 | unimportant | Not reported | Not reported |
| Debian | sudo | source | forky | 1.9.5-1 | unimportant | Not reported | Not reported |
| Debian | sudo | source | trixie | 1.9.5-1 | unimportant | Not reported | Not reported |
| Debian | sudo | source | bookworm | 1.9.5-1 | unimportant | Not reported | Not reported |
| Alpine | sudo | apk | 3.10 | 1.9.5p2-r0 | Not reported | ALPINE-CVE-2021-23240 | Not reported |
| Alpine | sudo | apk | 3.11 | 1.9.5p2-r0 | Not reported | ALPINE-CVE-2021-23240 | Not reported |
| Alpine | sudo | apk | 3.12 | 1.9.5-r0 | Not reported | ALPINE-CVE-2021-23240 | Not reported |
| Alpine | sudo | apk | 3.13 | 1.9.5-r0 | Not reported | ALPINE-CVE-2021-23240 | Not reported |
| Alpine | sudo | apk | 3.14 | 1.9.5-r0 | Not reported | ALPINE-CVE-2021-23240 | Not reported |
| Alpine | sudo | apk | 3.15 | 1.9.5-r0 | Not reported | ALPINE-CVE-2021-23240 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libnss-sudo]Fixed
Source package: [sudo]
Details (4)
1.9.13p3-1+deb12u4· all · bookwormFixed · Fixed:
1.9.5-1dsa · sudo · debian · bookworm; dsa · sudo · debian · 12
1.9.13p3-1+deb12u4· all · bookwormFixed · Fixed:
1.9.5-1dsa · sudo · debian · bookworm; dsa · sudo · debian · 12
1.9.13p3-1+deb12u2· all · bookworm-securityFixed · Fixed:
1.9.5-1dsa · sudo · debian · bookworm; dsa · sudo · debian · 12
1.9.13p3-1+deb12u2· all · bookworm-securityFixed · Fixed:
1.9.5-1dsa · sudo · debian · bookworm; dsa · sudo · debian · 12
- [sudo]Fixed
Details (4)
1.9.13p3-1+deb12u4· amd64 · bookwormFixed · Fixed:
1.9.5-1dsa · sudo · debian · bookworm; dsa · sudo · debian · 12
1.9.13p3-1+deb12u4· arm64 · bookwormFixed · Fixed:
1.9.5-1dsa · sudo · debian · bookworm; dsa · sudo · debian · 12
1.9.13p3-1+deb12u2· amd64 · bookworm-securityFixed · Fixed:
1.9.5-1dsa · sudo · debian · bookworm; dsa · sudo · debian · 12
1.9.13p3-1+deb12u2· arm64 · bookworm-securityFixed · Fixed:
1.9.5-1dsa · sudo · debian · bookworm; dsa · sudo · debian · 12
- [sudo-ldap]Fixed
Source package: [sudo]
Details (4)
1.9.13p3-1+deb12u4· amd64 · bookwormFixed · Fixed:
1.9.5-1dsa · sudo · debian · bookworm; dsa · sudo · debian · 12
1.9.13p3-1+deb12u4· arm64 · bookwormFixed · Fixed:
1.9.5-1dsa · sudo · debian · bookworm; dsa · sudo · debian · 12
1.9.13p3-1+deb12u2· amd64 · bookworm-securityFixed · Fixed:
1.9.5-1dsa · sudo · debian · bookworm; dsa · sudo · debian · 12
1.9.13p3-1+deb12u2· arm64 · bookworm-securityFixed · Fixed:
1.9.5-1dsa · sudo · debian · bookworm; dsa · sudo · debian · 12
[Debian 13 (Trixie)]
- [libnss-sudo]Fixed
Source package: [sudo]
Details (2)
1.9.16p2-3+deb13u2· all · trixieFixed · Fixed:
1.9.5-1dsa · sudo · debian · 13
1.9.16p2-3+deb13u2· all · trixieFixed · Fixed:
1.9.5-1dsa · sudo · debian · 13
- [sudo]Fixed
Details (2)
1.9.16p2-3+deb13u2· amd64 · trixieFixed · Fixed:
1.9.5-1dsa · sudo · debian · 13
1.9.16p2-3+deb13u2· arm64 · trixieFixed · Fixed:
1.9.5-1dsa · sudo · debian · 13
- [sudo-ldap]Fixed
Source package: [sudo]
Details (2)
1.9.16p2-3+deb13u2· amd64 · trixieFixed · Fixed:
1.9.5-1dsa · sudo · debian · 13
1.9.16p2-3+deb13u2· arm64 · trixieFixed · Fixed:
1.9.5-1dsa · sudo · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/rhsa-2021_1723.json]
- [https://osv.dev/vulnerability/ALPINE-CVE-2021-23240]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2021-23240]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2021-23240]
- [https://security-tracker.debian.org/tracker/CVE-2021-23240]
- [https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-23240.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2021/wid-sec-w-2025-0227.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]