Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

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

Quick assessment

Affected
espressif esp-idf
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 6.3 · Medium EPSS 0.41% · P33

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-25532

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
ESF-IDF is Vulnerable to WPS Enrollee Fragment Integer Underflow
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数下溢(超界折返)
Source: CVE Program / CVE List V5
Vulnerability Title
Espressif ESP-IDF 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
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。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
espressif esp-idf = 5.5.2 -

II. Public POCs for CVE-2026-25532

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-25532

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-25532 (1)

Vendor Advisories for CVE-2026-25532 (1)

Same Patch Batch · espressif · 2026-02-04 · 3 CVEs total

CVE-2026-25507 6.3 MEDIUM ESF-IDF Has Use-after-free Vulnerability in BLE Provisioning
CVE-2026-25508 6.3 MEDIUM ESF-IDF Has Memory Safety Vulnerabilities in BLE Provisioning

IV. Related Vulnerabilities

Same product: esp-idf
Same vendor: espressif
Same weakness: CWE-191

V. Comments for CVE-2026-25532

No comments yet

Leave a comment