CVE catalog
CVE-2021-34432
mosquitto: CVE-2021-34432
- 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
- 1.25% · Oct 25, 2026
In Eclipse Mosquitto versions 2.0.7 and earlier, the server will crash if the client tries to send a PUBLISH packet with topic length = 0.
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 | mosquitto | sid | 2.1.2-3 | fixed |
| Debian | mosquitto | forky | 2.1.2-3 | fixed |
| Debian | mosquitto | trixie | 2.0.21-1 | fixed |
| Debian | mosquitto | bookworm | 2.0.11-1.2+deb12u2 | fixed |
| Debian | mosquitto | bookworm-security | 2.0.11-1.2+deb12u1 | fixed |
| Alpine | mosquitto | 3.11 | 1.6.8-r1 | fixed |
| Alpine | mosquitto | 3.12 | 1.6.9-r1 | fixed |
| Alpine | mosquitto | 3.13 | 1.6.12-r3 | fixed |
| Alpine | mosquitto | 3.14 | 2.0.8-r0 | fixed |
| Alpine | mosquitto | 3.15 | 2.0.8-r0 | fixed |
| Alpine | mosquitto | 3.16 | 2.0.8-r0 | fixed |
| Alpine | mosquitto | 3.17 | 2.0.8-r0 | fixed |
| Alpine | mosquitto | 3.18 | 2.0.8-r0 | fixed |
| Alpine | mosquitto | 3.19 | 2.0.8-r0 | fixed |
| Alpine | mosquitto | 3.20 | 2.0.8-r0 | fixed |
| Alpine | mosquitto | 3.21 | 2.0.8-r0 | fixed |
| Alpine | mosquitto | 3.22 | 2.0.8-r0 | fixed |
| Alpine | mosquitto | 3.23 | 2.0.8-r0 | fixed |
| Alpine | mosquitto | 3.24 | 2.0.8-r0 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | mosquitto | source | sid | 2.0.8-1 | not yet assigned | Not reported | Not reported |
| Debian | mosquitto | source | forky | 2.0.8-1 | not yet assigned | Not reported | Not reported |
| Debian | mosquitto | source | trixie | 2.0.8-1 | not yet assigned | Not reported | Not reported |
| Debian | mosquitto | source | bookworm | 2.0.8-1 | not yet assigned | Not reported | Not reported |
| Alpine | mosquitto | apk | 3.11 | 1.6.8-r1 | Not reported | ALPINE-CVE-2021-34432 | Not reported |
| Alpine | mosquitto | apk | 3.12 | 1.6.9-r1 | Not reported | ALPINE-CVE-2021-34432 | Not reported |
| Alpine | mosquitto | apk | 3.13 | 1.6.12-r3 | Not reported | ALPINE-CVE-2021-34432 | Not reported |
| Alpine | mosquitto | apk | 3.14 | 2.0.8-r0 | Not reported | ALPINE-CVE-2021-34432 | Not reported |
| Alpine | mosquitto | apk | 3.15 | 2.0.8-r0 | Not reported | ALPINE-CVE-2021-34432 | Not reported |
| Alpine | mosquitto | apk | 3.16 | 2.0.8-r0 | Not reported | ALPINE-CVE-2021-34432 | Not reported |
| Alpine | mosquitto | apk | 3.17 | 2.0.8-r0 | Not reported | ALPINE-CVE-2021-34432 | Not reported |
| Alpine | mosquitto | apk | 3.18 | 2.0.8-r0 | Not reported | ALPINE-CVE-2021-34432 | Not reported |
| Alpine | mosquitto | apk | 3.19 | 2.0.8-r0 | Not reported | ALPINE-CVE-2021-34432 | Not reported |
| Alpine | mosquitto | apk | 3.20 | 2.0.8-r0 | Not reported | ALPINE-CVE-2021-34432 | Not reported |
| Alpine | mosquitto | apk | 3.21 | 2.0.8-r0 | Not reported | ALPINE-CVE-2021-34432 | Not reported |
| Alpine | mosquitto | apk | 3.22 | 2.0.8-r0 | Not reported | ALPINE-CVE-2021-34432 | Not reported |
| Alpine | mosquitto | apk | 3.23 | 2.0.8-r0 | Not reported | ALPINE-CVE-2021-34432 | Not reported |
| Alpine | mosquitto | apk | 3.24 | 2.0.8-r0 | Not reported | ALPINE-CVE-2021-34432 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libmosquitto1]Fixed
Source package: [mosquitto]
Details (6)
2.0.11-1.2+deb12u2· amd64 · bookwormFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u2· arm64 · bookwormFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.21-1~bpo12+1· amd64 · bookworm-backportsFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.21-1~bpo12+1· arm64 · bookworm-backportsFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u1· amd64 · bookworm-securityFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u1· arm64 · bookworm-securityFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
- [libmosquitto-dev]Fixed
Source package: [mosquitto]
Details (6)
2.0.11-1.2+deb12u2· amd64 · bookwormFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u2· arm64 · bookwormFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.21-1~bpo12+1· amd64 · bookworm-backportsFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.21-1~bpo12+1· arm64 · bookworm-backportsFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u1· amd64 · bookworm-securityFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u1· arm64 · bookworm-securityFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
- [libmosquittopp1]Fixed
Source package: [mosquitto]
Details (6)
2.0.11-1.2+deb12u2· amd64 · bookwormFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u2· arm64 · bookwormFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.21-1~bpo12+1· amd64 · bookworm-backportsFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.21-1~bpo12+1· arm64 · bookworm-backportsFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u1· amd64 · bookworm-securityFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u1· arm64 · bookworm-securityFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
- [libmosquittopp-dev]Fixed
Source package: [mosquitto]
Details (6)
2.0.11-1.2+deb12u2· amd64 · bookwormFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u2· arm64 · bookwormFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.21-1~bpo12+1· amd64 · bookworm-backportsFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.21-1~bpo12+1· arm64 · bookworm-backportsFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u1· amd64 · bookworm-securityFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u1· arm64 · bookworm-securityFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
- [mosquitto]Fixed
Details (6)
2.0.11-1.2+deb12u2· amd64 · bookwormFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u2· arm64 · bookwormFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.21-1~bpo12+1· amd64 · bookworm-backportsFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.21-1~bpo12+1· arm64 · bookworm-backportsFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u1· amd64 · bookworm-securityFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u1· arm64 · bookworm-securityFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
- [mosquitto-clients]Fixed
Source package: [mosquitto]
Details (6)
2.0.11-1.2+deb12u2· amd64 · bookwormFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u2· arm64 · bookwormFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.21-1~bpo12+1· amd64 · bookworm-backportsFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.21-1~bpo12+1· arm64 · bookworm-backportsFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u1· amd64 · bookworm-securityFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u1· arm64 · bookworm-securityFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
- [mosquitto-dev]Fixed
Source package: [mosquitto]
Details (6)
2.0.11-1.2+deb12u2· all · bookwormFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u2· all · bookwormFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.21-1~bpo12+1· all · bookworm-backportsFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.21-1~bpo12+1· all · bookworm-backportsFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u1· all · bookworm-securityFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u1· all · bookworm-securityFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
[Debian 13 (Trixie)]
- [libmosquitto1]Fixed
Source package: [mosquitto]
Details (2)
2.0.21-1· amd64 · trixieFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · 13
2.0.21-1· arm64 · trixieFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · 13
- [libmosquitto-dev]Fixed
Source package: [mosquitto]
Details (2)
2.0.21-1· amd64 · trixieFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · 13
2.0.21-1· arm64 · trixieFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · 13
- [libmosquittopp1]Fixed
Source package: [mosquitto]
Details (2)
2.0.21-1· amd64 · trixieFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · 13
2.0.21-1· arm64 · trixieFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · 13
- [libmosquittopp-dev]Fixed
Source package: [mosquitto]
Details (2)
2.0.21-1· amd64 · trixieFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · 13
2.0.21-1· arm64 · trixieFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · 13
- [mosquitto]Fixed
Details (2)
2.0.21-1· amd64 · trixieFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · 13
2.0.21-1· arm64 · trixieFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · 13
- [mosquitto-clients]Fixed
Source package: [mosquitto]
Details (2)
2.0.21-1· amd64 · trixieFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · 13
2.0.21-1· arm64 · trixieFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · 13
- [mosquitto-dev]Fixed
Source package: [mosquitto]
Details (2)
2.0.21-1· all · trixieFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · 13
2.0.21-1· all · trixieFixed · Fixed:
2.0.8-1dsa · mosquitto · debian · 13
Observed:
References
- [https://osv.dev/vulnerability/ALPINE-CVE-2021-34432]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2021-34432]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2021-34432]
- [https://security-tracker.debian.org/tracker/CVE-2021-34432]
- [https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-34432.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2023/wid-sec-w-2023-1094.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]