CVE-2021-38675Network attack vector

Browser-session compromise via stored script injection

Published Oct 1, 2021 · Updated Sep 16, 2024

Stored cross-site scripting in QNAP Image2PDF before 2.1.5 allows remote attackers to inject malicious code into the web interface. QNAP has not published the affected endpoint, input field, storage location, or missing neutralization operation. Exploitation requires low-privileged access and user interaction, and the injected script can read or alter data in the victim's browser session.

CVSS severity5.4
Medium
EPSS probability0.60%
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 QNAP Image2PDF before 2.1.5 allows remote attackers to inject malicious code into the web interface. QNAP has not published the affected endpoint, input field, storage location, or missing neutralization operation. Exploitation requires low-privileged access and user interaction, and the injected script can read or alter data in the victim's browser session.

The record

CVE
CVE-2021-38675
Published
Oct 1, 2021
Updated
Sep 16, 2024
Vendor
Linn Products Limited
Product
Image2PDF
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 1, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=unspecified <2.1.5 ( 2021/08/17 )

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Linn Products Limited · Image2PDFversion=unspecified <2.1.5 ( 2021/08/17 )

Published CVSS scores

5.4QNAP Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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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