The EAP peer implementation in Espressif ESP-IDF 2.0.0 through 4.0.0 and ESP8266_NONOS_SDK 2.2.0 through 3.1.0 allows the installation of a…

published 2019-09-04 7y ago modified 2026-06-17 4mo ago also EUVD-2019-4181

cvss: 8.1; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.9%; EPSS 0.9% chance of exploitation in 30 days, percentile 59%
public exploits: 0; none known

The EAP peer implementation in Espressif ESP-IDF 2.0.0 through 4.0.0 and ESP8266_NONOS_SDK 2.2.0 through 3.1.0 allows the installation of a zero Pairwise Master Key (PMK) after the completion of any EAP authentication method, which allows attackers in radio range to replay, decrypt, or spoof frames via a rogue access point.

Patch / fix

links 1

matheus-garbelini.github.io/home/post/zero-pmk-installation/ advisory

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Exploit prediction

0.88% chance of exploitation in the next 30 days, higher than 59% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

github.com https://github.com/Matheus-Garbelini/esp32_esp8266_attacks referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.0	8.1	CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD	2.0	4.8	AV:A/AC:L/Au:N/C:P/I:P/A:N

Classification

Weakness

CWE-327 Use of a Broken or Risky Cryptographic Algorithm

References

matheus-garbelini.github.io /home/post/zero-pmk-installation/
patch, third-party-advisory
github.com /Matheus-Garbelini/esp32_esp8266_attacks
exploit, third-party-advisory
github.com /espressif
product

Sources

CVE List CVE-2019-12587
NVD CVE-2019-12587

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