CVE-2002-1849: ParaChat Server 4.0 does not log users off if the browser's back button is used, which allows remote attackers

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MEDIUM 5.0DOWNGRADE

CVE-2002-1849 is a medium-severity flaw (CVSS 5.0) affecting parachat server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ParaChat Server 4.0 does not log users off if the browser's back button is used, which allows remote attackers to cause a denial of service by repeatedly logging into a chat room, hitting the back button, then logging into the same chat room as a different user, which fills the chat room with invalid users.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	2.5% (top 15%)
CISA exploited list	No
Published	2002-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: parachat

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

Am I affected?

Timeline

2002-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:00 UTCUpdated Record last modified

parachat parachat server DOWNGRADE

Affected: 4.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0

1. Check installed version

apt-cache policy parachat-server || rpm -q parachat-server || parachat-server --version

2. No fixed release: DOWNGRADE to a release before 4.0 (Debian / Ubuntu)

apt-cache madison parachat-server sudo apt install parachat-server=<VERSION_BEFORE_4.0> sudo apt-mark hold parachat-server

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

dnf --showduplicates list parachat-server sudo dnf downgrade parachat-server-<VERSION_BEFORE_4.0> sudo dnf versionlock add parachat-server

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-2002-1849?

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

Is CVE-2002-1849 being exploited?

CVE-2002-1849 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-2002-1849 affect?

CVE-2002-1849 affects parachat server. Severity is medium (CVSS 5.0). ParaChat Server 4.0 does not log users off if the browser's back button is used, which allows remote attackers to cause a denial of service by repeatedly logging into a chat room, hitting the back button, then logging into the same chat roo

How urgent is CVE-2002-1849?

Priority 44/100. Public exploit reference

Related CVEs

CVE-2004-1568 MEDIUM 5.0 DOWNGRADE Directory traversal vulnerability in ParaChat Server 5.5 allows remote attackers to read arbitrary files via a

References

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