CVE-2020-25495: A reflected Cross-site scripting (XSS) vulnerability in Xinuo (formerly SCO) Openserver version 5 and 6 allows

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MEDIUM 6.1DOWNGRADE

CVE-2020-25495 is a medium-severity flaw (CVSS 6.1) affecting openserver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A reflected Cross-site scripting (XSS) vulnerability in Xinuo (formerly SCO) Openserver version 5 and 6 allows remote attackers to inject arbitrary web script or HTML tag via the parameter 'section'.

Why this priority

EPSS top 5%: very likely to be exploited
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	9.0% (top 5%)
CISA exploited list	No
Weakness	CWE-79
Published	2020-12-18
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: xinuos

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

Am I affected?

Timeline

2020-12-18 15:15 UTCPublished CVE record published
2026-06-17 03:06 UTCUpdated Record last modified

xinuos openserver DOWNGRADE

Affected: 5.0.7 · 6.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.0.7

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 5.0.7 (Debian / Ubuntu)

apt-cache madison openserver sudo apt install openserver=<VERSION_BEFORE_5.0.7> sudo apt-mark hold openserver

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list openserver sudo dnf downgrade openserver-<VERSION_BEFORE_5.0.7> sudo dnf versionlock add openserver

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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: SCO Openserver 5.0.7 - 'section' Reflected XSS
Nuclei scan template: Xinuo Openserver 5/6 - Cross-Site scripting

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-2020-25495?

openserver: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-25495 being exploited?

CVE-2020-25495 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-2020-25495 affect?

CVE-2020-25495 affects openserver. Severity is medium (CVSS 6.1). A reflected Cross-site scripting (XSS) vulnerability in Xinuo (formerly SCO) Openserver version 5 and 6 allows remote attackers to inject arbitrary web script or HTML tag via the parameter 'section'.

How urgent is CVE-2020-25495?

Priority 50/100. EPSS top 5%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2020-25494 CRITICAL 9.8 DOWNGRADE Xinuos (formerly SCO) Openserver v5 and v6 allows attackers to execute arbitrary commands via shell metacharac

References

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