CVE-2020-28055

Exp

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.

Published: 2020-11-10 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-28055 is rated High Exploit Risk (60.1/100): CVSS High severity, with low exploitation likelihood (EPSS 0.50%). 3 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2020-28055

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2020-28055

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.12% 0.50% +0.38%
2 2023-03-07 1.28% 0.12% -1.16%
3 2022-04-01 — 1.28% —

Full EPSS history (6 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-28055

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.8 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.9 [email protected]
7.2 2.0 HIGH
AV:L/AC:L/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 3.9 10.0 [email protected]

Weakness enumeration for CVE-2020-28055

Affected software / configurations for CVE-2020-28055

Vendor Product Version Raw CPE
tcl 32s330_firmware < v8-r851t10-lf1v091 cpe:2.3:o:tcl:32s330_firmware:*:*:*:*:*:*:*:*
tcl 40s330_firmware < v8-r851t10-lf1v091 cpe:2.3:o:tcl:40s330_firmware:*:*:*:*:*:*:*:*
tcl 43s434_firmware < v8-r851t02-lf1v440 cpe:2.3:o:tcl:43s434_firmware:*:*:*:*:*:*:*:*
tcl 50s434_firmware < v8-r851t02-lf1v440 cpe:2.3:o:tcl:50s434_firmware:*:*:*:*:*:*:*:*
tcl 55s434_firmware < v8-r851t02-lf1v440 cpe:2.3:o:tcl:55s434_firmware:*:*:*:*:*:*:*:*
tcl 65s434_firmware < v8-r851t02-lf1v440 cpe:2.3:o:tcl:65s434_firmware:*:*:*:*:*:*:*:*
tcl 75s434_firmware < v8-r851t02-lf1v440 cpe:2.3:o:tcl:75s434_firmware:*:*:*:*:*:*:*:*

References for CVE-2020-28055

URL Tags
https://github.com/sickcodes/security/blob/master/advisories/SICK-2020-012.md Exploit Third Party Advisory
https://github.com/sickcodes/security/blob/master/etc/CVE-2020-27403_CVE-2020-28055_GlobalFAQ.pdf Third Party Advisory
https://github.com/sickcodes/security/blob/master/etc/CVE-2020-27403_CVE-2020-28055_Press-Statement-and-Questions_11162020.pdf Third 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-2020-012 Exploit Third Party Advisory
https://support.tcl.com/vulnerabilities-found-in-tcl-android-tvs Vendor Advisory
https://twitter.com/johnjhacking/ Third Party Advisory
https://twitter.com/sickcodes/ Third Party Advisory
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