HOMEVULNERABILITIESCVE-2020-26557
HIGH

CVE-2020-26557

CWE-287Published: 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 (without possession of the AuthValue used in the provisioning protocol) to determine the AuthValue via a brute-force attack (unless the AuthValue is sufficiently random and changed each time).

NVD Source

Technical Analysis

CVE-2020-26557 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.

From a weakness classification perspective (CWE-287): Authentication bypass vulnerabilities allow attackers to access protected resources without valid credentials.

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

bluetooth1 product(s)
mesh profile
Source: NVD CPE · 2 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://kb.cert.org/vuls/id/799380
ADVISORYhttps://www.bluetooth.com/learn-about-bluetooth/key-attributes/bluetooth-security/reporting-security/

All References (5)

→
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://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/799380

Quick Facts

CVE IDCVE-2020-26557
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-287
CISA KEVNo
Affected1 vendor(s)
PublishedMay 24, 2021

Related CVEs (CWE-287)

CVE-2026-20182
KEV10.0
CVE-2026-57216
10.0
CVE-2020-15164
10.0
CVE-2019-16649
10.0
CVE-2026-20127
KEV10.0
CVE-2021-32637
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-26557 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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