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CVE-2025-55297: ESF-IDF BluFi Example Memory Overflow Vulnerability

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-08-21 · updated 2026-06-17
• Weakness: CWE-120

Description

ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. The BluFi example bundled in ESP-IDF was vulnerable to memory overflows in two areas: Wi-Fi credential handling and Diffie–Hellman key exchange. This vulnerability is fixed in 5.4.1, 5.3.3, 5.1.6, and 5.0.9.

Affected products

• espressif esp-idf: before 5.0.9; from 5.1 before 5.1.6; from 5.2 before 5.3.3; from 5.4 before 5.4.1 — fixed in 5.0.9, 5.1.6, 5.3.3, 5.4.1

How to fix

Upgrade to a fixed version: espressif esp-idf 5.0.9, 5.1.6, 5.3.3, 5.4.1. Check the vendor advisory for mitigations.

References

• https://github.com/espressif/esp-idf/commit/12b7a9e6d78012ab9184b7ccdb5524364bf7e345
• https://github.com/espressif/esp-idf/commit/3fc6c93936077cb1659e1f0e0268e62cf6423e9d
• https://github.com/espressif/esp-idf/commit/5f93ec3b11b6115475c34de57093b3672d594e8f
• https://github.com/espressif/esp-idf/commit/9cb7206d4ae8fd8f4296cd57d6c78a1656f42efa
• https://github.com/espressif/esp-idf/commit/abc18e93eb3500dbec74c3e589671ef82c8b3919
• https://github.com/espressif/esp-idf/commit/b1657d9dd4d0e48ed25e02cb8fe8413f479a2a84
• https://github.com/espressif/esp-idf/commit/bf50c0c197af30990026c8f8286298d2aa5a3c99
• https://github.com/espressif/esp-idf/commit/cb6929a2e6f2ff130b742332dc15eb23006c7cc9
• https://github.com/espressif/esp-idf/commit/cc00e9f2fc4f7e8fbaff27851b4a8b45fa483501
• https://github.com/espressif/esp-idf/commit/e65cf7ea2a2be52219ec9d4efc44aed5e490e91c
• https://github.com/espressif/esp-idf/commit/f40aa9c587a8e570dfde2e6330382dcd170d5a5d
• https://github.com/espressif/esp-idf/commit/f77da0d5b5382635c99e6708551b73802ad1213d

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