Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2023-5632— Unconditionally adding an event to the epoll causes excessive CPU consumption

Quick assessment

Affected
Eclipse Mosquitto
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Eclipse Mosquitto是Eclipse基金会的一套开源的消息代理软件。 Eclipse Mosquitto 2.0.5及之前版本存在安全漏洞，该漏洞源于当建立与mosquitto服务器连接而不发送数据时会导致添加EPOLLOUT事件，从而导致CPU消耗过多，攻击者利用该漏洞可能执行拒绝服务类型的攻击。

CVSS 7.5 · High EPSS 0.69% · P51

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2023-5632

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Unconditionally adding an event to the epoll causes excessive CPU consumption
Source: CVE Program / CVE List V5
Vulnerability 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
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
过度迭代
Source: CVE Program / CVE List V5
Vulnerability Title
Eclipse Mosquitto 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Eclipse Mosquitto是Eclipse基金会的一套开源的消息代理软件。 Eclipse Mosquitto 2.0.5及之前版本存在安全漏洞，该漏洞源于当建立与mosquitto服务器连接而不发送数据时会导致添加EPOLLOUT事件，从而导致CPU消耗过多，攻击者利用该漏洞可能执行拒绝服务类型的攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Eclipse Mosquitto 0 ~ 2.0.5 -

II. Public POCs for CVE-2023-5632

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8126 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2023-5632

请登录查看更多情报信息。

IV. Related Vulnerabilities

Same product: Mosquitto
Same vendor: Eclipse
Same weakness: CWE-834

V. Comments for CVE-2023-5632

No comments yet

Leave a comment