CVE-2026-25532— ESF-IDF is Vulnerable to WPS Enrollee Fragment Integer Underflow

ESF-IDF is Vulnerable to WPS Enrollee Fragment Integer Underflow

ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. In versions 5.5.2, 5.4.3, 5.3.4, 5.2.6, and 5.1.6, a vulnerability exists in the WPS (Wi-Fi Protected Setup) Enrollee implementation where malformed EAP-WSC packets with truncated payloads can cause integer underflow during fragment length calculation. When processing EAP-Expanded (WSC) messages, the code computes frag_len by subtracting header sizes from the total packet length. If an attacker sends a packet where the EAP Length field covers only the header and flags but omits the expected payload (such as the 2-byte Message Length field when WPS_MSG_FLAG_LEN is set), frag_len becomes negative. This negative value is then implicitly cast to size_t when passed to wpabuf_put_data(), resulting in a very large unsigned value. This issue has been patched in versions 5.5.3, 5.4.4, 5.3.5, 5.2.7, and 5.1.7.

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

整数下溢(超界折返)

Espressif ESP-IDF 数字错误漏洞

Espressif ESP-IDF是中国乐鑫（Espressif）公司的一款物联网开发框架。 Espressif ESP-IDF 5.5.2版本、5.4.3版本、5.3.4版本、5.2.6版本和5.1.6版本存在数字错误漏洞，该漏洞源于WPS注册实现处理畸形EAP-WSC数据包时存在整数下溢，可能导致传递极大无符号值。

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