High severity · published Jul 14, 2021
CVE-2021-34173
An attacker can cause a Denial of Service and kernel panic in v4.2 and earlier versions of Espressif esp32 via a malformed beacon csa frame
7.5
CVSS
1.5%
EPSS
No
On KEV
Description
An attacker can cause a Denial of Service and kernel panic in v4.2 and earlier versions of Espressif esp32 via a malformed beacon csa frame. The device requires a reboot to recover.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.5% · higher than 74% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EF
Esp32 Firmware · Espressif
through 4.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-34173
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-34173
Third Party Advisory
https://github.com/E7mer
Exploit
https://github.com/E7mer/OWFuzz
More from Esp32 Firmware
6.8
CVE-2025-27840
Espressif ESP32 chips allow 29 hidden HCI commands, such as 0xFC02 (Write memory)