PT-2021-6465 · Eclipse+1 · Eclipse Mosquitto+1

Bryan Pearson · Published 2021-06-10 · Updated 2025-03-10 · CVE-2021-34432

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions Eclipse Mosquitto versions 2.07 and earlier

Description The issue is related to the incorrect handling of a PUBLISH packet with a topic length of 0, which can cause the server to crash. This can be exploited by a remote attacker to disrupt the service. The topic length variable is crucial in this context, as setting it to 0 triggers the crash.

Recommendations For Eclipse Mosquitto versions 2.07 and earlier, as a temporary workaround, consider restricting the handling of PUBLISH packets with a topic length of 0 until a patch is available. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Improper Resource Release

RCE

Weakness Enumeration

CWE-404

CWE-20

Related Identifiers

ALT-PU-2023-4418

ALT-PU-2024-12359

ALT-PU-2025-3746

BDU:2022-01688

CVE-2021-34432

OESA-2022-1564

OESA-2022-2053

Affected Products

Alt Linux

Eclipse Mosquitto

References · 18

• 🔥 https://bugs.eclipse.org/bugs/show_bug.cgi?id=574141 · Exploit
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-34432 · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2022-1564 · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2022-2053 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-34432 · Vendor Advisory
• https://osv.dev/vulnerability/ALPINE-CVE-2021-34432 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-34432 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-34432 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-34432 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2021-34432 · Vendor Advisory
• https://bdu.fstec.ru/vul/2022-01688 · Security Note
• https://osv.dev/vulnerability/CVE-2021-34432 · Vendor Advisory
• https://github.com/eclipse/mosquitto/commit/9b08faf0bdaf5a4f2e6e3dd1ea7e8c57f70418d6 · Note
• https://security.alpinelinux.org/vuln/CVE-2021-34432 · Note
• https://t.me/cvenotify/19532 · Telegram Post