CVE-2009-0540: Cross-site scripting (XSS) vulnerability in Libero 5.3 SP5, and possibly other versions before 5.5 SP1, allows

Routine

MEDIUM 4.3DOWNGRADE

CVE-2009-0540 is a medium-severity flaw (CVSS 4.3) affecting libero. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting (XSS) vulnerability in Libero 5.3 SP5, and possibly other versions before 5.5 SP1, allows remote attackers to inject arbitrary web script or HTML via the search term field.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-79
Published	2009-02-25
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: insightinformatics

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2009-02-25 16:30 UTCPublished CVE record published
2026-06-16 23:05 UTCUpdated Record last modified

insightinformatics libero DOWNGRADE

Affected: 5.3 sp5

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.3

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 5.3 (Debian / Ubuntu)

apt-cache madison libero sudo apt install libero=<VERSION_BEFORE_5.3> sudo apt-mark hold libero

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

dnf --showduplicates list libero sudo dnf downgrade libero-<VERSION_BEFORE_5.3> sudo dnf versionlock add libero

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-2009-0540?

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

Is CVE-2009-0540 being exploited?

CVE-2009-0540 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-2009-0540 affect?

CVE-2009-0540 affects libero. Severity is medium (CVSS 4.3). Cross-site scripting (XSS) vulnerability in Libero 5.3 SP5, and possibly other versions before 5.5 SP1, allows remote attackers to inject arbitrary web script or HTML via the search term field.

How urgent is CVE-2009-0540?

Priority 37/100. Public exploit reference

References

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