ESF-IDF: Heap buffer overflow in protocomm Security2 over Bluetooth
Key facts
- Attack vector
- Adjacent network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · Low · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. In versions 5.2.6, 5.3.5, 5.4.4, 5.5.4, and 6.0, a heap buffer overflow exists in the Security Scheme 2 (SRP6a) session-setup path of the protocomm component. The first-phase handler (handle_session_command0() in components/protocomm/src/security/security2.c) trusts the length of a client-supplied protobuf field for the SRP6a username and copies it into a buffer whose size is derived from a narrower destination type. The resulting truncation-versus-copy asymmetry corrupts the heap when an oversized value is supplied. This issue has been patched in versions 5.2.7, 5.3.6, 5.4.5, 5.5.5, and 6.0.1.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| espressif | esp-idf | = 5.2.6; = 5.3.5; = 5.4.4; = 5.5.4; = 6.0 | — | No fix listed | CNA |
- esp-idf Vendorespressif Affected = 5.2.6; = 5.3.5; = 5.4.4; = 5.5.4; = 6.0 Fixed in — No fix listed CNA
CPE configurations NVD · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:espressif:esp-idf:5.2.6:*:*:*:*:*:*:* | 5.2.6 | Vulnerable | espressif |
| cpe:2.3:a:espressif:esp-idf:5.3.5:*:*:*:*:*:*:* | 5.3.5 | Vulnerable | espressif |
| cpe:2.3:a:espressif:esp-idf:5.4.4:*:*:*:*:*:*:* | 5.4.4 | Vulnerable | espressif |
| cpe:2.3:a:espressif:esp-idf:5.5.4:*:*:*:*:*:*:* | 5.5.4 | Vulnerable | espressif |
| cpe:2.3:a:espressif:esp-idf:6.0:*:*:*:*:*:*:* | 6.0 | Vulnerable | espressif |
- cpe:2.3:a:espressif:esp-idf:5.2.6:*:*:*:*:*:*:* Versions 5.2.6 Vulnerable ·espressif
- cpe:2.3:a:espressif:esp-idf:5.3.5:*:*:*:*:*:*:* Versions 5.3.5 Vulnerable ·espressif
- cpe:2.3:a:espressif:esp-idf:5.4.4:*:*:*:*:*:*:* Versions 5.4.4 Vulnerable ·espressif
- cpe:2.3:a:espressif:esp-idf:5.5.4:*:*:*:*:*:*:* Versions 5.5.4 Vulnerable ·espressif
- cpe:2.3:a:espressif:esp-idf:6.0:*:*:*:*:*:*:* Versions 6.0 Vulnerable ·espressif
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-45542
References
Patch 7
- https://github.com/espressif/esp-idf/security/advisories/GHSA-9r76-858f-v6jh
- https://github.com/espressif/esp-idf/commit/0ea58d79845ad674d0358d5de246015a68c4cb4f
- https://github.com/espressif/esp-idf/commit/56c3e385611e63162d0f2f8504ac4ae2ccfccef0
- https://github.com/espressif/esp-idf/commit/71eb2dbe6aaef830719ecac8edf409e2992b64b2
- https://github.com/espressif/esp-idf/commit/9b4cacf9cbc69379972de6a2247fcf5af9240961
- https://github.com/espressif/esp-idf/commit/a2f4554f10ba075c98cbc67464db096ba32497cf
- https://github.com/espressif/esp-idf/commit/f5d24a7e919bc5f447091479656b86da6762a103
More espressif Esp-idf vulnerabilities
- TI-2024-22076 Buffer Overflow vulnerability in esp-idf v.5.1 allows a remote attacker to execute… CVSS 3.1MEDIUM 6.5
- TI-2026-33125 ESF-IDF: Out-of-Bounds Write in ESP-TEE Secure Service Wrappers CVSS 3.1CRITICAL 9.3
- TI-2025-32598 ESP-NOW Integer Underflow Vulnerability Advisory CVSS 4.0HIGH 7.2
- TI-2022-08703 Espressif Bluetooth Mesh Stack Vulnerable to Out-of-bounds Write leading to memory buffer corruption CVSS 3.1HIGH 8.8
- TI-2021-09371 The Bluetooth Classic implementation in Espressif ESP-IDF 4.4 and earlier does not… CVSS 3.1HIGH 8.8
- TI-2026-33292 ESF-IDF: Remote Null Pointer Dereference in WebSocket Server CVSS 3.1HIGH 7.5
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences