CVE-2020-13594

Name: CVE-2020-13594
Creator: NVD / NIST
Published: 2020-08-31T15:15:10.633+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.76%

Last modified Jun 17, 2026

CVE-2020-13594 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. The Bluetooth Low Energy (BLE) controller implementation in Espressif ESP-IDF 4.2 and earlier (for ESP32 devices) does not properly restrict the channel map field of the connection request packet on reception, allowing attackers in radio range to cause a denial of service (crash) via a crafted packet.. EPSS estimates a 0.76% chance of exploitation in the next 30 days.

Description

The Bluetooth Low Energy (BLE) controller implementation in Espressif ESP-IDF 4.2 and earlier (for ESP32 devices) does not properly restrict the channel map field of the connection request packet on reception, allowing attackers in radio range to cause a denial of service (crash) via a crafted packet.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.76%

50.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Espressif	Esp-Idf	<= 4.2

References

https://asset-group.github.io/cves.htmlThird Party Advisory
https://asset-group.github.io/disclosures/sweyntooth/Third Party Advisory
https://github.com/espressif/esp32-bt-libThird Party Advisory
https://asset-group.github.io/cves.htmlThird Party Advisory
https://asset-group.github.io/disclosures/sweyntooth/Third Party Advisory
https://github.com/espressif/esp32-bt-libThird Party Advisory

Timeline

Published: Aug 31, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-13594?

How severe is CVE-2020-13594?

CVE-2020-13594 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.76% probability of exploitation in the next 30 days.

How do I fix CVE-2020-13594?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-13594?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST