CVE-2021-20111Network attack vector

Stored script execution via dotfile upload

Published Jul 29, 2021 · Updated Aug 3, 2024

Stored cross-site scripting in TCExam 14.8.1 and earlier allows remote authenticated users to execute script via uploaded dotfiles. The tce_filemanager.php upload handler serves valid files whose names begin with a period as text/html, preserving attacker-controlled JavaScript for execution when another user views the file. Access to the file manager is required and the resulting impact is browser-context script execution against the viewing user, with no reported server compromise or service interruption.

CVSS severity5.4
Medium
EPSS probability0.61%
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 execute script via uploaded dotfiles. The tce_filemanager.php upload handler serves valid files whose names begin with a period as text/html, preserving attacker-controlled JavaScript for execution when another user views the file. Access to the file manager is required and the resulting impact is browser-context script execution against the viewing user, with no reported server compromise or service interruption.

The record

CVE
CVE-2021-20111
Published
Jul 29, 2021
Updated
Aug 3, 2024
Vendor
Tecnick.com LTD
Product
TCExam
Classifications
CWE-79, T1189
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

5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NVDAV: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')
T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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