HOME VULNERABILITIESCVE-2020-28055

HIGH

CVE-2020-28055

CWE-732Published: November 10, 2020· Updated: Jun 17, 2026

7.8

CVSS v3.1

Official Description

A vulnerability in the TCL Android Smart TV series V8-R851T02-LF1 V295 and below and V8-T658T01-LF1 V373 and below by TCL Technology Group Corporation allows a local unprivileged attacker, such as a malicious App, to read & write to the /data/vendor/tcl, /data/vendor/upgrade, and /var/TerminalManager directories within the TV file system. An attacker, such as a malicious APK or local unprivileged user could perform fake system upgrades by writing to the /data/vendor/upgrage folder.

Technical Analysis

CVE-2020-28055 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

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 7.8.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges Req.Low

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

tcl14 product(s)

32s330 firmware32s33040s330 firmware40s33043s434 firmware43s43450s434 firmware50s43455s434 firmware55s43465s434 firmware65s434+2

Source: NVD CPE · 14 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

CVE Program entry

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://github.com/sickcodes/security/blob/master/advisories/SICK-2020-012.md

ADVISORYhttps://github.com/sickcodes/security/blob/master/etc/CVE-2020-27403_CVE-2020-28055_GlobalFAQ.pdf

ADVISORYhttps://github.com/sickcodes/security/blob/master/etc/CVE-2020-27403_CVE-2020-28055_Press-Statement-and-Questions_11162020.pdf

ADVISORYhttps://securityledger.com/2020/11/security-holes-opened-back-door-to-tcl-android-smart-tvs/

ADVISORYhttps://securityledger.com/2020/11/tv-maker-tcl-denies-back-door-promises-better-process/

ADVISORYhttps://sick.codes/extraordinary-vulnerabilities-discovered-in-tcl-android-tvs-now-worlds-3rd-largest-tv-manufacturer/

ADVISORYhttps://sick.codes/sick-2020-012

ADVISORYhttps://support.tcl.com/vulnerabilities-found-in-tcl-android-tvs

ADVISORYhttps://twitter.com/johnjhacking/

ADVISORYhttps://twitter.com/sickcodes/

ADVISORYhttps://github.com/sickcodes/security/blob/master/advisories/SICK-2020-012.md

ADVISORYhttps://github.com/sickcodes/security/blob/master/etc/CVE-2020-27403_CVE-2020-28055_GlobalFAQ.pdf

ADVISORYhttps://github.com/sickcodes/security/blob/master/etc/CVE-2020-27403_CVE-2020-28055_Press-Statement-and-Questions_11162020.pdf

ADVISORYhttps://securityledger.com/2020/11/security-holes-opened-back-door-to-tcl-android-smart-tvs/

ADVISORYhttps://securityledger.com/2020/11/tv-maker-tcl-denies-back-door-promises-better-process/

ADVISORYhttps://sick.codes/extraordinary-vulnerabilities-discovered-in-tcl-android-tvs-now-worlds-3rd-largest-tv-manufacturer/

ADVISORYhttps://sick.codes/sick-2020-012

ADVISORYhttps://support.tcl.com/vulnerabilities-found-in-tcl-android-tvs

ADVISORYhttps://twitter.com/johnjhacking/

ADVISORYhttps://twitter.com/sickcodes/

All References (20)

→

https://github.com/sickcodes/security/blob/master/advisories/SICK-2020-012.mdExploit · Third Party Advisory

→

https://github.com/sickcodes/security/blob/master/etc/CVE-2020-27403_CVE-2020-28055_GlobalFAQ.pdfThird Party Advisory

→

https://github.com/sickcodes/security/blob/master/etc/CVE-2020-27403_CVE-2020-28055_Press-Statement-and-Questions_11162020.pdfThird Party Advisory

→

https://securityledger.com/2020/11/security-holes-opened-back-door-to-tcl-android-smart-tvs/Third Party Advisory

→

https://securityledger.com/2020/11/tv-maker-tcl-denies-back-door-promises-better-process/Third Party Advisory

→

https://sick.codes/extraordinary-vulnerabilities-discovered-in-tcl-android-tvs-now-worlds-3rd-largest-tv-manufacturer/Exploit · Third Party Advisory

→

https://sick.codes/sick-2020-012Exploit · Third Party Advisory

→

https://support.tcl.com/vulnerabilities-found-in-tcl-android-tvsVendor Advisory

→

https://twitter.com/johnjhacking/Third Party Advisory

→

https://twitter.com/sickcodes/Third Party Advisory

→

https://github.com/sickcodes/security/blob/master/advisories/SICK-2020-012.mdExploit · Third Party Advisory

→

https://github.com/sickcodes/security/blob/master/etc/CVE-2020-27403_CVE-2020-28055_GlobalFAQ.pdfThird Party Advisory

→

https://github.com/sickcodes/security/blob/master/etc/CVE-2020-27403_CVE-2020-28055_Press-Statement-and-Questions_11162020.pdfThird Party Advisory

→

https://securityledger.com/2020/11/security-holes-opened-back-door-to-tcl-android-smart-tvs/Third Party Advisory

→

https://securityledger.com/2020/11/tv-maker-tcl-denies-back-door-promises-better-process/Third Party Advisory

Quick Facts

CVE IDCVE-2020-28055

CVSS Score7.8 / 10

SeverityHIGH

WeaknessCWE-732

CISA KEVNo

Affected1 vendor(s)

PublishedNov 10, 2020

Related CVEs (CWE-732)

CVE-2014-125121

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2020-28055 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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