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Vulnerability record · CVE-2018-20378 · published 29 March 2019

CVE-2018-20378: Opensynergy blue sdk improper input validation vulnerability

Opensynergy · Blue Sdk

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.

7.5 CVSS 3.0 High EPSS 2.3% · top 17.5% CWE-20 · Improper input validation
7.5CVSS 3.0 base score, v2 5.4
2.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.cymotive.com/wp-content/uploads/2019/03/Hell2CAP-0day.pdf ExploitThird Party Advisory
https://www.opensynergy.com/news/security/bluesdk-advisory2018003/ Vendor Advisory
https://www.cymotive.com/wp-content/uploads/2019/03/Hell2CAP-0day.pdf ExploitThird Party Advisory
https://www.opensynergy.com/news/security/bluesdk-advisory2018003/ Vendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2018-20378), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.