Vulnerability · Published Nov 2, 2021 · Assigned by eclipse
CVE-2021-41036
Critical 9.8
In plain English
A critical-severity out-of-bounds write in Eclipse Paho MQTT C Client from The Eclipse Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.2% (higher than 69% of all known vulnerabilities).
Severity (CVSS NVD)9.8Critical
Exploit odds (30 days)1.2%top 31.3% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu:22.04:LTS | paho.mqtt.c | no fix listed | UBUNTU-CVE-2021-41036 |
| Ubuntu:24.04:LTS | paho.mqtt.c | no fix listed | UBUNTU-CVE-2021-41036 |
| Ubuntu:25.10 | paho.mqtt.c | no fix listed | UBUNTU-CVE-2021-41036 |
| Ubuntu:26.04:LTS | paho.mqtt.c | no fix listed | UBUNTU-CVE-2021-41036 |
| Ubuntu:26.10 | paho.mqtt.c | no fix listed | UBUNTU-CVE-2021-41036 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| The Eclipse Foundation | Eclipse Paho MQTT C Client | unspecified – before 1.1.0 |
Weakness: CWE-787
References
- https://github.com/eclipse/paho.mqtt.embedded-c/issues/96 x_refsource_CONFIRM