CVE-2005-1063: The administration protocol for Kerio WinRoute Firewall 6.x up to 6.0.10, Personal Firewall 4.x up to 4.1.2, a

Routine

MEDIUM 5.0DOWNGRADEDOWNGRADEDOWNGRADE

CVE-2005-1063 is a medium-severity flaw (CVSS 5.0) affecting kerio mailserver, personal firewall, winroute firewall. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The administration protocol for Kerio WinRoute Firewall 6.x up to 6.0.10, Personal Firewall 4.x up to 4.1.2, and MailServer up to 6.0.8 allows remote attackers to cause a denial of service (CPU consumption) via certain attacks that force the product to "compute unexpected conditions" and "perform cryptographic operations."

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	1.6% (top 25%)
CISA exploited list	No
Published	2005-04-29
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: kerio

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

Am I affected?

Timeline

2005-04-29 04:00 UTCPublished CVE record published
2026-06-16 22:12 UTCUpdated Record last modified

kerio kerio mailserver DOWNGRADE

Affected: 6.0 · 6.0.1 · 6.0.2 · 6.0.3 · 6.0.4 · 6.0.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.0

1. Check installed version

apt-cache policy kerio-mailserver || rpm -q kerio-mailserver || kerio-mailserver --version

2. No fixed release: DOWNGRADE to a release before 6.0 (Debian / Ubuntu)

apt-cache madison kerio-mailserver sudo apt install kerio-mailserver=<VERSION_BEFORE_6.0> sudo apt-mark hold kerio-mailserver

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

dnf --showduplicates list kerio-mailserver sudo dnf downgrade kerio-mailserver-<VERSION_BEFORE_6.0> sudo dnf versionlock add kerio-mailserver

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.

kerio personal firewall DOWNGRADE

Affected: 4.0.6 · 4.0.7 · 4.0.8 · 4.0.9 · 4.0.10 · 4.0.16 · 4.1 · 4.1.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0.6

1. Check installed version

apt-cache policy personal-firewall || rpm -q personal-firewall || personal-firewall --version

2. No fixed release: DOWNGRADE to a release before 4.0.6 (Debian / Ubuntu)

apt-cache madison personal-firewall sudo apt install personal-firewall=<VERSION_BEFORE_4.0.6> sudo apt-mark hold personal-firewall

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

dnf --showduplicates list personal-firewall sudo dnf downgrade personal-firewall-<VERSION_BEFORE_4.0.6> sudo dnf versionlock add personal-firewall

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.

kerio winroute firewall DOWNGRADE

Affected: 6.0 · 6.0.1 · 6.0.2 · 6.0.3 · 6.0.4 · 6.0.5 · 6.0.6 · 6.0.7

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.0

1. Check installed version

apt-cache policy winroute-firewall || rpm -q winroute-firewall || winroute-firewall --version

2. No fixed release: DOWNGRADE to a release before 6.0 (Debian / Ubuntu)

apt-cache madison winroute-firewall sudo apt install winroute-firewall=<VERSION_BEFORE_6.0> sudo apt-mark hold winroute-firewall

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

dnf --showduplicates list winroute-firewall sudo dnf downgrade winroute-firewall-<VERSION_BEFORE_6.0> sudo dnf versionlock add winroute-firewall

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-2005-1063?

kerio mailserver: downgrade or apply the listed mitigation; personal firewall: downgrade or apply the listed mitigation; winroute firewall: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2005-1063 being exploited?

CVE-2005-1063 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-2005-1063 affect?

CVE-2005-1063 affects kerio mailserver, personal firewall, winroute firewall. Severity is medium (CVSS 5.0). The administration protocol for Kerio WinRoute Firewall 6.x up to 6.0.10, Personal Firewall 4.x up to 4.1.2, and MailServer up to 6.0.8 allows remote attackers to cause a denial of service (CPU consumption) via certain attacks that force th

How urgent is CVE-2005-1063?

Priority 36/100. No elevated risk signals yet.

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References

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