What’s Vulnerable › Vulnerabilities

CVE-2021-41036

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-11-03 · updated 2026-06-17
• Weakness: CWE-787

Description

In versions prior to 1.1 of the Eclipse Paho MQTT C Client, the client does not check rem_len size in readpacket.

Affected products

• The Eclipse Foundation Eclipse Paho MQTT C Client: before 1.1.0 — fixed in 1.1.0

How to fix

Upgrade to a fixed version: The Eclipse Foundation Eclipse Paho MQTT C Client 1.1.0. Check the vendor advisory for mitigations.

References

• https://github.com/eclipse/paho.mqtt.embedded-c/issues/96
• https://github.com/eclipse/paho.mqtt.embedded-c/issues/96

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