CVE-2020-15261: On Windows the Veyon Service before version 4.4.2 contains an unquoted service path vulnerability, allowing lo

Q: How do I fix CVE-2020-15261?

veyon: upgrade to 4.4.2. Exact commands for each OS are on this page.

Q: Is CVE-2020-15261 being exploited?

CVE-2020-15261 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-15261 affect?

CVE-2020-15261 affects veyon. Severity is high (CVSS 8.0). On Windows the Veyon Service before version 4.4.2 contains an unquoted service path vulnerability, allowing locally authenticated users with administrative privileges to run malicious executables with LocalSystem privileges. Since Veyon use

Q: How urgent is CVE-2020-15261?

Priority 57/100. High severity; EPSS top 4%: very likely to be exploited; Public exploit reference

This week

HIGH 8.0UPGRADE

CVE-2020-15261 is a high-severity flaw (CVSS 8.0) affecting veyon. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

On Windows the Veyon Service before version 4.4.2 contains an unquoted service path vulnerability, allowing locally authenticated users with administrative privileges to run malicious executables with LocalSystem privileges. Since Veyon users (both students and teachers) usually don't have administrative privileges, this vulnerability is only dangerous in anyway unsafe setups. The problem has been fixed in version 4.4.2. As a workaround, the expl

Why this priority

High severity
EPSS top 4%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.0 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	High
User interaction	None
EPSS exploit chance	11.3% (top 4%)
CISA exploited list	No
Weakness	CWE-428
Published	2020-10-19
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: veyon

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-10-19 22:15 UTCPublished CVE record published
2026-06-17 02:56 UTCUpdated Record last modified

veyon veyon UPGRADE

Affected: < 4.4.2

Fixed in: 4.4.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy veyon || rpm -q veyon || veyon --version

2. UPGRADE to 4.4.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade veyon

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade veyon

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Veyon 4.4.1 - 'VeyonService' Unquoted Service Path

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-15261?

veyon: upgrade to 4.4.2. Exact commands for each OS are on this page.

Is CVE-2020-15261 being exploited?

CVE-2020-15261 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-15261 affect?

CVE-2020-15261 affects veyon. Severity is high (CVSS 8.0). On Windows the Veyon Service before version 4.4.2 contains an unquoted service path vulnerability, allowing locally authenticated users with administrative privileges to run malicious executables with LocalSystem privileges. Since Veyon use

How urgent is CVE-2020-15261?

Priority 57/100. High severity; EPSS top 4%: very likely to be exploited; Public exploit reference

Software pages

Windows vulnerabilities

References

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