CVE-2021-41583Network attack vector

Authenticated filesystem disclosure via QR-code exec option

Published Sep 24, 2021 · Updated Aug 4, 2024

Improper input validation in eduVPN vpn-user-portal before 2.3.14 allows remote authenticated users to read OS filesystem files via QR codes. The QR-code path passes a filesystem reference to an exec operation using the -r option without adequately restricting which files it can access. A valid portal account is required, and exposed files can enable additional VPN access without reported file modification or service interruption.

CVSS severity6.5
Medium
EPSS probability1.88%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in eduVPN vpn-user-portal before 2.3.14 allows remote authenticated users to read OS filesystem files via QR codes. The QR-code path passes a filesystem reference to an exec operation using the -r option without adequately restricting which files it can access. A valid portal account is required, and exposed files can enable additional VPN access without reported file modification or service interruption.

The record

CVE
CVE-2021-41583
Published
Sep 24, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-20, T1005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 24, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.0NIST NVDAV:N/AC:L/Au:S/C:C/I:C/A:C
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/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-20Improper Input Validation
T1005Data from Local System

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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