CVE-2006-0818: Absolute path directory traversal vulnerability in (1) MERAK Mail Server for Windows 8.3.8r with before IceWar

Routine

MEDIUM 4.0DOWNGRADEDOWNGRADEDOWNGRADE

CVE-2006-0818 is a medium-severity flaw (CVSS 4.0) affecting visnetic mail server, web mail, mail server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Absolute path directory traversal vulnerability in (1) MERAK Mail Server for Windows 8.3.8r with before IceWarp Web Mail 5.6.1 and (2) VisNetic MailServer before 8.5.0.5 allows remote authenticated users to include arbitrary files via a modified language parameter and a full Windows or UNC pathname in the lang_settings parameter to mail/index.html, which is not properly sanitized by the validatefolder PHP function, possibly due to an incomplete f

Why this priority

Public exploit reference

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

Risk facts

CVSS score	4.0 (Medium)
EPSS exploit chance	2.1% (top 19%)
CISA exploited list	No
Published	2006-07-21
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: deerfield · icewarp · merak

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

Am I affected?

Timeline

2006-07-21 14:03 UTCPublished CVE record published
2026-06-16 22:21 UTCUpdated Record last modified

deerfield visnetic mail server DOWNGRADE

Affected: 8.3.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.3.5

1. Check installed version

apt-cache policy visnetic-mail-server || rpm -q visnetic-mail-server || visnetic-mail-server --version

2. No fixed release: DOWNGRADE to a release before 8.3.5 (Debian / Ubuntu)

apt-cache madison visnetic-mail-server sudo apt install visnetic-mail-server=<VERSION_BEFORE_8.3.5> sudo apt-mark hold visnetic-mail-server

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

dnf --showduplicates list visnetic-mail-server sudo dnf downgrade visnetic-mail-server-<VERSION_BEFORE_8.3.5> sudo dnf versionlock add visnetic-mail-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.

icewarp web mail DOWNGRADE

Affected: 5.6.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.6.0

1. Check installed version

apt-cache policy web-mail || rpm -q web-mail || web-mail --version

2. No fixed release: DOWNGRADE to a release before 5.6.0 (Debian / Ubuntu)

apt-cache madison web-mail sudo apt install web-mail=<VERSION_BEFORE_5.6.0> sudo apt-mark hold web-mail

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

dnf --showduplicates list web-mail sudo dnf downgrade web-mail-<VERSION_BEFORE_5.6.0> sudo dnf versionlock add web-mail

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.

merak mail server DOWNGRADE

Affected: 8.3.8r

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.3.8r

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 8.3.8r (Debian / Ubuntu)

apt-cache madison mail-server sudo apt install mail-server=<VERSION_BEFORE_8.3.8r> sudo apt-mark hold mail-server

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

dnf --showduplicates list mail-server sudo dnf downgrade mail-server-<VERSION_BEFORE_8.3.8r> sudo dnf versionlock add mail-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-2006-0818?

visnetic mail server: downgrade or apply the listed mitigation; web mail: downgrade or apply the listed mitigation; mail server: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2006-0818 being exploited?

CVE-2006-0818 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-2006-0818 affect?

CVE-2006-0818 affects visnetic mail server, web mail, mail server. Severity is medium (CVSS 4.0). Absolute path directory traversal vulnerability in (1) MERAK Mail Server for Windows 8.3.8r with before IceWarp Web Mail 5.6.1 and (2) VisNetic MailServer before 8.5.0.5 allows remote authenticated users to include arbitrary files via a mod

How urgent is CVE-2006-0818?

Priority 39/100. Public exploit reference

Software pages

PHP vulnerabilities · Windows vulnerabilities

Related CVEs

CVE-2006-0817 MEDIUM 5.0 DOWNGRADE DOWNGRADE Absolute path directory traversal vulnerability in (a) MERAK Mail Server for Windows 8.3.8r with before IceWar
CVE-2005-4559 MEDIUM 5.0 DOWNGRADE DOWNGRADE mail/include.html in IceWarp Web Mail 5.5.1, as used by Merak Mail Server 8.3.0r and VisNetic Mail Server vers
CVE-2005-4558 MEDIUM 6.5 DOWNGRADE DOWNGRADE IceWarp Web Mail 5.5.1, as used by Merak Mail Server 8.3.0r and VisNetic Mail Server version 8.3.0 build 1, do
CVE-2005-4557 MEDIUM 5.0 DOWNGRADE DOWNGRADE dir/include.html in IceWarp Web Mail 5.5.1, as used by Merak Mail Server 8.3.0r and VisNetic Mail Server versi
CVE-2005-4556 HIGH 7.5 DOWNGRADE DOWNGRADE PHP remote file include vulnerability in IceWarp Web Mail 5.5.1, as used by Merak Mail Server 8.3.0r and VisNe

References

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