ESF-IDF: Bluetooth Classic L2CAP Heap Memory Disclosure Allowing Unauthorized Access to Sensitive Data
Summary
| CVE | CVE-2026-81507 |
|---|---|
| State | PUBLISHED |
| Assigner | GitHub_M |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-10-13 16:17:23 UTC |
| Updated | 2026-10-16 16:00:33 UTC |
| Description | ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. Prior to 5.2.8, 5.3.6, 5.5.5, 6.0.3, and 6.1-rc1, ESP-IDF BlueDroid L2CAP configuration-option processing in l2c_main.c and l2c_utils.c does not consistently validate option lengths against the remaining received packet bytes. A remote unauthenticated BR/EDR peer within radio range can send a malformed L2CAP configuration request that causes an out-of-bounds read, and under some runtime conditions limited adjacent Bluetooth stack memory can be included in an outbound L2CAP Configuration Response. The issue affects ESP32-class products using the BlueDroid host stack with Classic Bluetooth enabled. This issue is fixed in 5.2.8, 5.3.6, 5.5.5, 6.0.3, and 6.1-rc1. |
Risk And Classification
Primary CVSS: v3.1 6.5 MEDIUM from [email protected]
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS: 0.002640000 probability, percentile 0.170680000 (date 2026-10-14)
Problem Types: CWE-125 | CWE-125 CWE-125: Out-of-bounds Read
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Secondary | 6.5 | MEDIUM | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| 3.1 | CNA | DECLARED | 6.5 | MEDIUM | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
CVSS v3.1 Breakdown
Attack Vector
AdjacentAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
NoneAvailability
NoneCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Espressif | Esp-idf | affected < 5.2.8 | Not specified |
| CNA | Espressif | Esp-idf | affected >= 5.3-beta1, < 5.3.6 | Not specified |
| CNA | Espressif | Esp-idf | affected >= 5.4-beta1, < 5.5.5 | Not specified |
| CNA | Espressif | Esp-idf | affected >= 6.0-beta1, < 6.0.3 | Not specified |
| CNA | Espressif | Esp-idf | affected >= 6.1-beta1, < 6.1-rc1 | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| github.com/espressif/esp-idf/releases/tag/v5.5.5 | [email protected] | github.com | |
| github.com/espressif/esp-idf/security/advisories/GHSA-v335-fxwc-rc44 | [email protected] | github.com | |
| github.com/espressif/esp-idf/commit/c8cd8f4f3019ae2f912c8cbe9974445e8d9b... | [email protected] | github.com | |
| github.com/espressif/esp-idf/commit/5731c63ece128f156939b9f734256e2227c1... | [email protected] | github.com | |
| github.com/espressif/esp-idf/commit/9a6d04f65e0e341e7d72bd417c9f31b8a04c... | [email protected] | github.com | |
| github.com/espressif/esp-idf/commit/14c99559b4337cabcf0f09c21d16b93c4cd7... | [email protected] | github.com | |
| github.com/espressif/esp-idf/commit/c2610255a5adce651ca582bb82368c3dd0ee... | [email protected] | github.com | |
| github.com/espressif/esp-idf/commit/1e07f6d83ca892630a7210df2958455f7ca7... | [email protected] | github.com | |
| github.com/espressif/esp-idf/commit/8de265dc44b1b22c749ea44ee7c609b3da41... | [email protected] | github.com | |
| github.com/espressif/esp-idf/releases/tag/v6.0.3 | [email protected] | github.com | |
| github.com/espressif/esp-idf/releases/tag/v5.3.6 | [email protected] | github.com | |
| github.com/espressif/esp-idf/releases/tag/v6.1-rc1 | [email protected] | github.com | |
| github.com/espressif/esp-idf/releases/tag/v5.2.8 | [email protected] | github.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.