TI-2021-09370 Aliases CVE-2021-28136 GHSA-w488-94f6-hhmr

The Bluetooth Classic implementation in Espressif ESP-IDF 4.4 and earlier does not…

LOW 30CWE-787Published 2021-09-07 · Updated 2024-08-03

Key facts

Attack vector: Adjacent network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.

Summary

The Bluetooth Classic implementation in Espressif ESP-IDF 4.4 and earlier does not properly handle the reception of multiple LMP IO Capability Request packets during the pairing process, allowing attackers in radio range to trigger memory corruption (and consequently a crash) in ESP32 via a replayed (duplicated) LMP packet.

Why it matters now

EPSS 0.00844 58th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:a:espressif:esp-idf::::::::	up to 4.4	Vulnerable	espressif
cpe:2.3:h:espressif:esp32:-:::::::*	not specified by NVD	Running on	espressif

cpe:2.3:a:espressif:esp-idf:*:*:*:*:*:*:*:* Versions up to 4.4 Vulnerable ·espressif
cpe:2.3:h:espressif:esp32:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·espressif

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-28136
2026-10-03 Alias added: GHSA-w488-94f6-hhmr

References

Advisory 4

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

See all 30 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences