arduino-esp32 is an Arduino core for the ESP32, ESP32-S2, ESP32-S3, ESP32-C3, ESP32-C6 and ESP32-H2 microcontrollers. Prior to 3.3.8, there is a remotely reachable memory corruption issue in the NBNS packet handling path. When NetBIOS is enabled by calling NBNS.begin(...), the device listens on UDP port 137 and processes untrusted NBNS requests from the local network. The request parser trusts the attacker-controlled name_len field without enforcing a bound consistent with the fixed-size destination buffers used later in the flow. This vulnerability is fixed in 3.3.8.
Fix
Patch, vendor advisory and mitigation references on NVD 2
- https://github.com/espressif/arduino-esp32/security/advisories/GHSA-92j9-c75g-2c5f Exploit, Vendor Advisory
- https://github.com/espressif/arduino-esp32/security/advisories/GHSA-92j9-c75g-2c5f Exploit, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 8.8 · espressifNVD modified 2026-10-26 22:10
Affected (CPE criteria) 1
cpe:2.3:a:espressif:arduino-esp32:*:*:*:*:*:*:*:*
References 2
- https://github.com/espressif/arduino-esp32/security/advisories/GHSA-92j9-c75g-2c5f Exploit, Vendor Advisory
- https://github.com/espressif/arduino-esp32/security/advisories/GHSA-92j9-c75g-2c5f Exploit, Vendor Advisory