CVE-2021-20112Network attack vector

Stored script execution via dot-prefixed filenames

Published Jul 29, 2021 · Updated Aug 3, 2024

Stored cross-site scripting in TCExam 14.8.1 and earlier allows remote authenticated users to run JavaScript through a viewed upload. The F_upload_file function sanitizes and accepts allowed names that start with a period, causing the web server to serve the moved file as HTML. Access to tce_select_mediafile.php is required, and another user must view the file before the payload executes in that user's browser session.

CVSS severity5.4
Medium
EPSS probability0.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in TCExam 14.8.1 and earlier allows remote authenticated users to run JavaScript through a viewed upload. The F_upload_file function sanitizes and accepts allowed names that start with a period, causing the web server to serve the moved file as HTML. Access to tce_select_mediafile.php is required, and another user must view the file before the payload executes in that user's browser session.

The record

CVE
CVE-2021-20112
Published
Jul 29, 2021
Updated
Aug 3, 2024
Vendor
Tecnick.com LTD
Product
TCExam
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 29, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=14.8.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Tecnick.com LTD · TCExamversion=14.8.1

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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