What’s Vulnerable › Vulnerabilities

CVE-2018-20378

• Severity: high (CVSS 7.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-03-29 · updated 2026-06-17
• Weakness: CWE-20

Description

The L2CAP signaling channel implementation and SDP server implementation in OpenSynergy Blue SDK 3.2 through 6.0 allow remote, unauthenticated attackers to execute arbitrary code or cause a denial of service via malicious L2CAP configuration requests, in conjunction with crafted SDP communication over maliciously configured L2CAP channels. The attacker must have connectivity over the Bluetooth physical layer, and must be able to send raw L2CAP frames. This is related to L2Cap_HandleConfigReq in core/stack/l2cap/l2cap_sm.c and SdpServHandleServiceSearchAttribReq in core/stack/sdp/sdpserv.c.

Affected products

• Opensynergy Blue Sdk: from 3.2 through 5.5.3; from 6.0 before 6.0.1 — fixed in 6.0.1

How to fix

Upgrade to a fixed version: Opensynergy Blue Sdk 6.0.1. Check the vendor advisory for mitigations.

References

• https://www.cymotive.com/wp-content/uploads/2019/03/Hell2CAP-0day.pdf
• https://www.opensynergy.com/news/security/bluesdk-advisory2018003/
• https://www.cymotive.com/wp-content/uploads/2019/03/Hell2CAP-0day.pdf
• https://www.opensynergy.com/news/security/bluesdk-advisory2018003/

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