CVE-2020-10062CWE-193

Packet length decoding error in MQTT

Critical · published June 5, 2020

CVSS v3.1
9.0
EPSS
3%
Percentile
86.7
In the wild
Unconfirmed
What it is

🔥 An off-by-one error in the Zephyr MQTT packet length decoder could let an attacker execute code remotely. That's like handing out keys to a vault while forgetting to check if they're duplicates! Think of the decoder as a waiter who miscounts plates on a food order; one less plate could lead to a disastrous mix-up in the kitchen! If the waiter doesn’t catch that miscount, chaos in the dining area isn’t the only concern—someone might get served something they shouldn’t! This vulnerability opens the door for potential memory corruption, leading to remote code execution. An attacker could harness this flaw to run malicious code on affected systems, which could compromise sensitive data or disrupt critical operations. The implications could be absolutely devastating, especially in IoT applications where safety is paramount.

Put simply

Think of the decoder as a waiter who miscounts plates on a food order; one less plate could lead to a disastrous mix-up in the kitchen! If the waiter doesn’t catch that miscount, chaos in the dining area isn’t the only concern—someone might get served something they shouldn’t! CVE-2020-10062 is caused by an off-by-one error in the MQTT packet length decoder within Zephyr project versions 2.2.0 and later. This flaw allows improper memory handling, potentially leading to memory corruption and remote code execution if exploited.

What to do

This vulnerability opens the door for potential memory corruption, leading to remote code execution. An attacker could harness this flaw to run malicious code on affected systems, which could compromise sensitive data or disrupt critical operations. The implications could be absolutely devastating, especially in IoT applications where safety is paramount. To safeguard against this vulnerability, update to Zephyr version 2.6.0 or later immediately. Additionally, review your code for proper error handling in MQTT implementations to mitigate similar risks in the future. You've got this! With these steps, you'll have your systems secured in no time. 🛡️

The record
Technical detail
CVSS v3.1
9.0 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.02879 · 86.7th percentile
Weakness
CWE-193 · Off-by-one Error
Published
2020-06-05T17:37Z
EPSS history
Timeline
  • 05 JUN 17:37Z
    Packet length decoding error in MQTT
    cvelistv5