HOMEVULNERABILITIESCVE-2021-27943
HIGH

CVE-2021-27943

CWE-307Published: August 2, 2021· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

The pairing procedure used by the Vizio P65-F1 6.0.31.4-2 and E50x-E1 10.0.31.4-2 Smart TVs and mobile application is vulnerable to a brute-force attack (against only 10000 possibilities), allowing a threat actor to forcefully pair the device, leading to remote control of the TV settings and configurations.

NVD Source

Technical Analysis

CVE-2021-27943 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

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 full integrity compromise (data manipulation), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected Vendors & Products

vizio4 product(s)
p65-f1 firmwarep65-f1e50x-e1 firmwaree50x-e1
Source: NVD CPE · 4 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://www.l9group.com/advisories/vizio-tv-mobile-pairing-is-vulnerable-to-brute-force-attacks
ADVISORYhttps://www.vizio.com
ADVISORYhttps://www.l9group.com/advisories/vizio-tv-mobile-pairing-is-vulnerable-to-brute-force-attacks
ADVISORYhttps://www.vizio.com

All References (4)

→
https://www.l9group.com/advisories/vizio-tv-mobile-pairing-is-vulnerable-to-brute-force-attacksExploit · Third Party Advisory
→
https://www.vizio.comVendor Advisory
→
https://www.l9group.com/advisories/vizio-tv-mobile-pairing-is-vulnerable-to-brute-force-attacksExploit · Third Party Advisory
→
https://www.vizio.comVendor Advisory

Quick Facts

CVE IDCVE-2021-27943
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-307
CISA KEVNo
Affected1 vendor(s)
PublishedAug 2, 2021

Related CVEs (CWE-307)

CVE-2019-4336
9.8
CVE-2018-19548
9.8
CVE-2018-1475
9.8
CVE-2016-9124
9.8
CVE-2017-15887
9.8
CVE-2020-7995
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-27943 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. CVE data is provided under the NVD usage policy.
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