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CVE-2005-4556: PHP remote file include vulnerability in IceWarp Web Mail 5.5.1, as used by Merak Mail Server 8.3.0r and VisNe

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This week
HIGH 7.5DOWNGRADEDOWNGRADEDOWNGRADE

CVE-2005-4556 is a high-severity flaw (CVSS 7.5) 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.

PHP remote file include vulnerability in 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, when register_globals is enabled, allows remote attackers to include arbitrary local and remote PHP files via a URL in the (1) lang_settings and (2) language parameters in (a) accounts/inc/include.php and (b) admin/inc/include.php.

Why this priority

  • High severity
  • EPSS top 4%: very likely to be exploited
  • Public exploit reference

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

Risk facts

CVSS score7.5 (High)
EPSS exploit chance10.6% (top 4%)
CISA exploited listNo
Published2005-12-28
Last modified2026-06-16
Publisher (CNA): MITRE · Vendor: deerfield · icewarp · merak

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

Am I affected?

Timeline

deerfield visnetic mail server DOWNGRADE
Affected: 8.3.0_build1
Fixed in: no fixed release known
Safe to downgrade to: a release before 8.3.0_build1
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 8.3.0_build1 (Debian / Ubuntu)
apt-cache madison visnetic-mail-server sudo apt install visnetic-mail-server=<VERSION_BEFORE_8.3.0_build1> 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_8.3.0_build1> 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: 5.5.1
Fixed in: no fixed release known
Safe to downgrade to: a release before 5.5.1
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 5.5.1 (Debian / Ubuntu)
apt-cache madison web-mail sudo apt install web-mail=<VERSION_BEFORE_5.5.1> 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_5.5.1> 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: 8.3.0r
Fixed in: no fixed release known
Safe to downgrade to: a release before 8.3.0r
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 8.3.0r (Debian / Ubuntu)
apt-cache madison mail-server sudo apt install mail-server=<VERSION_BEFORE_8.3.0r> 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_8.3.0r> 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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

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-2005-4556?

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-2005-4556 being exploited?

CVE-2005-4556 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-2005-4556 affect?

CVE-2005-4556 affects visnetic mail server, web mail, mail server. Severity is high (CVSS 7.5). PHP remote file include vulnerability in 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, when register_globals is enabled, allows remote attackers to include arbitrary local and re

How urgent is CVE-2005-4556?

Priority 55/100. High severity; EPSS top 4%: very likely to be exploited; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

References

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