What’s Vulnerable › Vulnerabilities

CVE-2020-28055

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-11-10 · updated 2026-06-17
• Weakness: CWE-732

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.

Affected products

• TCL 32S330 Firmware: before v8-r851t10-lf1v091 — fixed in v8-r851t10-lf1v091
• TCL 40S330 Firmware: before v8-r851t10-lf1v091 — fixed in v8-r851t10-lf1v091
• TCL 43S434 Firmware: before v8-r851t02-lf1v440 — fixed in v8-r851t02-lf1v440
• TCL 50S434 Firmware: before v8-r851t02-lf1v440 — fixed in v8-r851t02-lf1v440
• TCL 55S434 Firmware: before v8-r851t02-lf1v440 — fixed in v8-r851t02-lf1v440
• TCL 65S434 Firmware: before v8-r851t02-lf1v440 — fixed in v8-r851t02-lf1v440
• TCL 75S434 Firmware: before v8-r851t02-lf1v440 — fixed in v8-r851t02-lf1v440

How to fix

Upgrade to a fixed version: TCL 32S330 Firmware v8-r851t10-lf1v091; TCL 40S330 Firmware v8-r851t10-lf1v091; TCL 43S434 Firmware v8-r851t02-lf1v440; TCL 50S434 Firmware v8-r851t02-lf1v440; TCL 55S434 Firmware v8-r851t02-lf1v440; TCL 65S434 Firmware v8-r851t02-lf1v440; TCL 75S434 Firmware v8-r851t02-lf1v440. Check the vendor advisory for mitigations.

References

• https://github.com/sickcodes/security/blob/master/advisories/SICK-2020-012.md
• https://github.com/sickcodes/security/blob/master/etc/CVE-2020-27403_CVE-2020-28055_GlobalFAQ.pdf
• https://github.com/sickcodes/security/blob/master/etc/CVE-2020-27403_CVE-2020-28055_Press-Statement-and-Questions_11162020.pdf
• https://securityledger.com/2020/11/security-holes-opened-back-door-to-tcl-android-smart-tvs/
• https://securityledger.com/2020/11/tv-maker-tcl-denies-back-door-promises-better-process/
• https://sick.codes/extraordinary-vulnerabilities-discovered-in-tcl-android-tvs-now-worlds-3rd-largest-tv-manufacturer/
• https://sick.codes/sick-2020-012
• https://support.tcl.com/vulnerabilities-found-in-tcl-android-tvs
• https://twitter.com/johnjhacking/
• https://twitter.com/sickcodes/
• https://github.com/sickcodes/security/blob/master/advisories/SICK-2020-012.md
• https://github.com/sickcodes/security/blob/master/etc/CVE-2020-27403_CVE-2020-28055_GlobalFAQ.pdf

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