Medium severity · published Aug 31, 2020
CVE-2020-13594
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…
6.5
CVSS
0.8%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Adjacent
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 57% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ES
Esp-idf · Espressif
through 4.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-13594
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-13594
Third Party Advisory
https://asset-group.github.io/cves.html
Third Party Advisory
https://asset-group.github.io/disclosures/sweyntooth/
Third Party Advisory
https://github.com/espressif/esp32-bt-lib
More from Esp-idf
9.8
CVE-2025-52471
ESP-NOW Integer Underflow Vulnerability Advisory
9.1
CVE-2025-66409
ESF-IDF has an Out-of-Bounds Read in ESP32 Bluetooth AVRCP Command Handling
8.8
CVE-2026-45328
ESF-IDF: Out-of-Bounds Write in ESP-TEE Secure Service Wrappers
8.8
CVE-2025-55297
ESF-IDF BluFi Example Memory Overflow Vulnerability
8.8
CVE-2024-53406
Espressif Esp idf v5.3.0 is vulnerable to Insecure Permissions resulting in Authentication bypass