CVE-2018-5954: phpFreeChat 1.7 and earlier allows remote attackers to cause a denial of service by sending a large number of

Q: How do I fix CVE-2018-5954?

phpfreechat: upgrade to newer than 1.7. Exact commands for each OS are on this page.

Q: Is CVE-2018-5954 being exploited?

CVE-2018-5954 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2018-5954 affect?

CVE-2018-5954 affects phpfreechat. Severity is high (CVSS 7.5). phpFreeChat 1.7 and earlier allows remote attackers to cause a denial of service by sending a large number of connect commands.

Q: How urgent is CVE-2018-5954?

Priority 60/100. High severity; EPSS top 5%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2018-5954 is a high-severity flaw (CVSS 7.5) affecting phpfreechat. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

phpFreeChat 1.7 and earlier allows remote attackers to cause a denial of service by sending a large number of connect commands.

Why this priority

High severity
EPSS top 5%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	8.9% (top 5%)
CISA exploited list	No
Weakness	CWE-400
Published	2018-01-25
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: phpfreechat

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

Am I affected?

Timeline

2018-01-25 16:29 UTCPublished CVE record published
2026-06-17 02:01 UTCUpdated Record last modified

phpfreechat phpfreechat UPGRADE

Affected: <= 1.7

Fixed in: newer than 1.7

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 1.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade phpfreechat

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade phpfreechat

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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: PHPFreeChat 1.7 - Denial of Service

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-2018-5954?

phpfreechat: upgrade to newer than 1.7. Exact commands for each OS are on this page.

Is CVE-2018-5954 being exploited?

CVE-2018-5954 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-2018-5954 affect?

CVE-2018-5954 affects phpfreechat. Severity is high (CVSS 7.5). phpFreeChat 1.7 and earlier allows remote attackers to cause a denial of service by sending a large number of connect commands.

How urgent is CVE-2018-5954?

Priority 60/100. High severity; EPSS top 5%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

References

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