Vulnerability · Published Oct 18, 2023 · Assigned by eclipse
CVE-2023-5632Unconditionally adding an event to the epoll causes excessive CPU consumption
High 7.5
In plain English
A high-severity security flaw in Mosquitto from Eclipse. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 57% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.8%top 43.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
In Eclipse Mosquito before and including 2.0.5, establishing a connection to the mosquitto server without sending data causes the EPOLLOUT event to be added, which results excessive CPU consumption. This could be used by a malicious actor to perform denial of service type attack. This issue is fixed in 2.0.6
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | mosquitto | 2.0.7-1 | DEBIAN-CVE-2023-5632 |
| Debian:13 | mosquitto | 2.0.7-1 | DEBIAN-CVE-2023-5632 |
| Debian:14 | mosquitto | 2.0.7-1 | DEBIAN-CVE-2023-5632 |
| Ubuntu:22.04:LTS | mosquitto | 2.0.11-1ubuntu1 | UBUNTU-CVE-2023-5632 |
Affected products (as reported)
Weakness: CWE-834 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H