CVE-2020-27403

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 an attacker on the adjacent network to arbitrarily browse and download sensitive files over an insecure web server running on port 7989 that lists all files & directories. An unprivileged remote attacker on the adjacent network, can download most system files, leading to serious critical information disclosure. Also, some TV models and/or FW versions may expose the webserver with the entire filesystem accessible on another port. For example, nmap scan for all ports run directly from the TV model U43P6046 (Android 8.0) showed port 7983 not mentioned in the original CVE description, but containing the same directory listing of the entire filesystem. This webserver is bound (at least) to localhost interface and accessible freely to all unprivileged installed apps on the Android such as a regular web browser. Any app can therefore read any files of any other apps including Android system settings including sensitive data such as saved passwords, private keys etc.

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-2020-27403 is rated High Exploit Risk (71.5/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 2.69%). 3 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +1.16% over the last day, indicating growing attacker interest. 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-2020-27403

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-2020-27403

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 1.52% 2.69% +1.16%
2 2026-04-03 2.32% 1.52% -0.80%
3 2025-12-30 — 2.32% —

Full EPSS history (14 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-27403

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.1 MEDIUM
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:A)
Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
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:N)
No account or special rights needed—anonymous or random user is enough.
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:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 3.6 [email protected]
3.3 2.0 LOW
AV:A/AC:L/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:A)
Requires access to an adjacent network segment.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 6.5 2.9 [email protected]

Weakness enumeration for CVE-2020-27403

Affected software / configurations for CVE-2020-27403

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-2020-27403

URL Tags
https://github.com/sickcodes Third Party Advisory
https://github.com/sickcodes/security/blob/master/advisories/SICK-2020-009.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://github.com/sickcodes/security/issues/1 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-2020-009 Exploit Third Party Advisory
https://support.tcl.com/vulnerabilities-found-in-tcl-android-tvs Vendor Advisory
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