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CVE Record

CVE-2020-27403: A vulnerability in the TCL Android Smart TV series V8-R851T02-LF1 V295 and below and V8-T658T01-LF1 V373 an...

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.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

Certain TCL Android Smart TVs exposed an insecure file-browsing web service. A nearby network attacker, or an unprivileged app on the TV, could download sensitive system and application files. The supplied sources do not show active exploitation or a confirmed CVSS score.

Executive priority

Treat this as a targeted asset-risk issue, not a broad internet emergency. Prioritize inventory and isolation of TCL Android TVs in offices, labs, hospitality spaces, and executive areas where sensitive networks or nearby attackers could matter.

Technical view

CVE-2020-27403 affects TCL Android Smart TV firmware V8-R851T02-LF1 V295 and below, and V8-T658T01-LF1 V373 and below. The issue is an unauthenticated directory-listing web server on port 7989, with reports of similar exposure on port 7983 for some models or firmware versions.

Likely exposure

Exposure is likely limited to TCL Android Smart TVs running the named firmware branches or similar affected builds. Network exploitation requires adjacent-network access. Local exploitation may be possible from any unprivileged app installed on the TV if the vulnerable service is reachable on localhost.

Exploitation context

The supplied bundle marks KEV as false and provides no cited evidence of active exploitation. The risk is serious because successful access can disclose system files, app data, settings, saved passwords, private keys, or other sensitive material depending on model and firmware.

Researcher notes

Evidence supports unauthenticated information disclosure over an embedded web server, with possible model-specific alternate-port behavior. The affected product list is incomplete in the CVE metadata, so validation should rely on model, firmware, network exposure, and TCL guidance rather than CPE matching alone.

Mitigation direction

  • Identify TCL Android Smart TVs and record model and firmware versions.
  • Check TCL support guidance for fixed firmware or vendor-specific remediation.
  • Segment smart TVs away from sensitive corporate systems and administrative networks.
  • Restrict adjacent-network access to affected TVs where business use requires retention.
  • Remove unnecessary or untrusted apps from affected TVs.

Validation and detection

  • Confirm whether any TV runs V8-R851T02-LF1 V295 or below.
  • Confirm whether any TV runs V8-T658T01-LF1 V373 or below.
  • From a trusted internal assessment host, check for unexpected web services on affected TVs.
  • Validate whether exposed services allow unauthenticated file browsing without downloading sensitive files.
  • Review app inventory on affected TVs for untrusted or unnecessary applications.
Prepared
Confidence
medium
Sources
7

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

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CVE-2020-27403 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
11Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.