HOMEVULNERABILITIESCVE-2020-26556
HIGH

CVE-2020-26556

CWE-307Published: May 24, 2021· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

Mesh Provisioning in the Bluetooth Mesh profile 1.0 and 1.0.1 may permit a nearby device, able to conduct a successful brute-force attack on an insufficiently random AuthValue before the provisioning procedure times out, to complete authentication by leveraging Malleable Commitment.

NVD Source

Technical Analysis

CVE-2020-26556 requires adjacent network access, limiting remote exploitation but still posing risk in shared or local network environments.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorAdjacent
Attack ComplexityHigh
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

bluetooth2 product(s)
bluetooth core specificationmesh profile
Source: NVD CPE · 3 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://kb.cert.org/vuls/id/799380
ADVISORYhttps://www.bluetooth.com/learn-about-bluetooth/key-attributes/bluetooth-security/reporting-security/
ADVISORYhttps://www.kb.cert.org/vuls/id/799380
ADVISORYhttps://kb.cert.org/vuls/id/799380
ADVISORYhttps://www.bluetooth.com/learn-about-bluetooth/key-attributes/bluetooth-security/reporting-security/
ADVISORYhttps://www.kb.cert.org/vuls/id/799380

All References (6)

→
https://kb.cert.org/vuls/id/799380Third Party Advisory · US Government Resource
→
https://www.bluetooth.com/learn-about-bluetooth/key-attributes/bluetooth-security/reporting-security/Vendor Advisory
→
https://www.kb.cert.org/vuls/id/799380Third Party Advisory · US Government Resource
→
https://kb.cert.org/vuls/id/799380Third Party Advisory · US Government Resource
→
https://www.bluetooth.com/learn-about-bluetooth/key-attributes/bluetooth-security/reporting-security/Vendor Advisory
→
https://www.kb.cert.org/vuls/id/799380Third Party Advisory · US Government Resource

Quick Facts

CVE IDCVE-2020-26556
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-307
CISA KEVNo
Affected1 vendor(s)
PublishedMay 24, 2021

Related CVEs (CWE-307)

CVE-2017-7898
9.8
CVE-2017-1197
9.8
CVE-2016-9124
9.8
CVE-2025-8679
9.8
CVE-2025-58587
9.8
CVE-2017-7673
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-26556 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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