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CVE-2026-25508— ESF-IDF Has Memory Safety Vulnerabilities in BLE Provisioning

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版本存在缓冲区错误漏洞，该漏洞源于BLE ATT Prepare Write处理存在越界读取问题，可能导致内存损坏。

CVSS 6.3 · Medium EPSS 0.20% · P11
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I. Basic Information for CVE-2026-25508

Vulnerability Information
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Vulnerability Title
ESF-IDF Has Memory Safety Vulnerabilities in BLE Provisioning
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, an out-of-bounds read vulnerability was reported in the BLE ATT Prepare Write handling of the BLE provisioning transport (protocomm_ble). The issue can be triggered by a remote BLE client while the device is in provisioning mode. The transport accumulated prepared-write fragments in a fixed-size buffer but incorrectly tracked the cumulative length. By sending repeated prepare write requests with overlapping offsets, a remote client could cause the reported length to exceed the allocated buffer size. This inflated length was then passed to provisioning handlers during execute-write processing, resulting in an out-of-bounds read and potential memory corruption. 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
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
Espressif ESP-IDF 缓冲区错误漏洞
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版本存在缓冲区错误漏洞，该漏洞源于BLE ATT Prepare Write处理存在越界读取问题，可能导致内存损坏。
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-2026-25508

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III. Intelligence Information for CVE-2026-25508

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Patches & Fixes for CVE-2026-25508 (4)

Vendor Advisories for CVE-2026-25508 (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-2026-25532 6.3 MEDIUM ESF-IDF is Vulnerable to WPS Enrollee Fragment Integer Underflow

IV. Related Vulnerabilities

Same product: esp-idf
Same vendor: espressif
Same weakness: CWE-125

V. Comments for CVE-2026-25508

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