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CVE-2018-20958

21
FAUCET Score

CVE-2018-20958 describes a vulnerability in Tapplock devices (before firmware 2018-06-12) where the Bluetooth Low Energy (BLE) subsystem uses easily derivable credentials (Key1 and SerialNo from the broadcasted MAC address) for unlock operations. This medium-severity vulnerability (CVSS 6.5) allows an adjacent attacker to achieve high confidentiality impact without user interaction. While no active exploitation, public exploit code, or significant community discussion has been observed, the fundamental flaw allows unauthorized unlocking of affected devices.

Impacted Technologies

VendorProductVersion(s)CPE
< 2018-06-12CPE matchmatch criteria
cpe:2.3:o:tapplock:tapplock_firmware:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.5MEDIUM

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

Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.50%
Probability of exploitation in next 30 days
EPSS Percentile
39.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0050 is in the 60th percentile among its peer group of 1,802 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

tapplock.com / notice/20180612
Vendor Advisory
pentestpartners.com / security-blog/totally-pwning-the-tapplock-smart-lock
Third Party Advisory