CVE-2020-20990: A cross site scripting (XSS) vulnerability in the /segments/edit.php component of Domainmod 4.13 allows attack

Routine

MEDIUM 5.4DOWNGRADE

CVE-2020-20990 is a medium-severity flaw (CVSS 5.4) affecting domainmod. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A cross site scripting (XSS) vulnerability in the /segments/edit.php component of Domainmod 4.13 allows attackers to execute arbitrary web scripts or HTML via the Segment Name parameter.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-08-12
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: domainmod

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

Am I affected?

Timeline

2021-08-12 22:15 UTCPublished CVE record published
2026-06-17 03:03 UTCUpdated Record last modified

domainmod domainmod DOWNGRADE

Affected: 4.13.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.13.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.13.0 (Debian / Ubuntu)

apt-cache madison domainmod sudo apt install domainmod=<VERSION_BEFORE_4.13.0> sudo apt-mark hold domainmod

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

dnf --showduplicates list domainmod sudo dnf downgrade domainmod-<VERSION_BEFORE_4.13.0> sudo dnf versionlock add domainmod

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.

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-2020-20990?

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

Is CVE-2020-20990 being exploited?

CVE-2020-20990 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-2020-20990 affect?

CVE-2020-20990 affects domainmod. Severity is medium (CVSS 5.4). A cross site scripting (XSS) vulnerability in the /segments/edit.php component of Domainmod 4.13 allows attackers to execute arbitrary web scripts or HTML via the Segment Name parameter.

How urgent is CVE-2020-20990?

Priority 36/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

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References

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