CVE-2005-4203: LogiSphere 0.9.9j does not restrict the number of messages that can be sent, which allows remote attackers to

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HIGH 7.8DOWNGRADE

CVE-2005-4203 is a high-severity flaw (CVSS 7.8) affecting logisphere. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

LogiSphere 0.9.9j does not restrict the number of messages that can be sent, which allows remote attackers to cause a denial of service by sending a large number of messages via the msg command. NOTE: due to lack of appropriate details by the original researcher, it is unclear whether this description accurately reflects the discloser's claim and is distinct from the XSS issue.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.8 (High)
EPSS exploit chance	2.0% (top 20%)
CISA exploited list	No
Published	2005-12-13
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: logisphere

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

Am I affected?

Timeline

2005-12-13 11:03 UTCPublished CVE record published
2026-06-16 22:18 UTCUpdated Record last modified

logisphere logisphere DOWNGRADE

Affected: 0.9.9j

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.9.9j

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.9.9j (Debian / Ubuntu)

apt-cache madison logisphere sudo apt install logisphere=<VERSION_BEFORE_0.9.9j> sudo apt-mark hold logisphere

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

dnf --showduplicates list logisphere sudo dnf downgrade logisphere-<VERSION_BEFORE_0.9.9j> sudo dnf versionlock add logisphere

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-2005-4203?

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

Is CVE-2005-4203 being exploited?

CVE-2005-4203 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-2005-4203 affect?

CVE-2005-4203 affects logisphere. Severity is high (CVSS 7.8). LogiSphere 0.9.9j does not restrict the number of messages that can be sent, which allows remote attackers to cause a denial of service by sending a large number of messages via the msg command. NOTE: due to lack of appropriate details by

How urgent is CVE-2005-4203?

Priority 52/100. High severity; Public exploit reference

Related CVEs

CVE-2006-3044 LOW 2.6 DOWNGRADE Cross-site scripting (XSS) vulnerability in LogiSphere 1.6.0 allows remote attackers to inject arbitrary web s
CVE-2005-4204 MEDIUM 4.3 DOWNGRADE Cross-site scripting (XSS) vulnerability in LogiSphere 0.9.9j allows remote attackers to inject arbitrary Java
CVE-2005-4202 MEDIUM 5.0 DOWNGRADE Multiple directory traversal vulnerabilities in LogiSphere 0.9.9j allow remote attackers to access arbitrary f

References

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