CVE-2005-4828: Kolab Server 2.0.0 and 2.0.1 does not properly handle when a large email is sent with a "." in the wrong place

This month

MEDIUM 6.4DOWNGRADE

CVE-2005-4828 is a medium-severity flaw (CVSS 6.4) affecting kolab groupware server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Kolab Server 2.0.0 and 2.0.1 does not properly handle when a large email is sent with a "." in the wrong place, which causes kolabfilter to add another ".", which might break clear-text signatures and attachments. NOTE: it is not clear whether this issue crosses privilege boundaries, so this might not be a vulnerability.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.4 (Medium)
EPSS exploit chance	1.3% (top 30%)
CISA exploited list	No
Published	2005-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: kolab

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

Am I affected?

Timeline

2005-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:19 UTCUpdated Record last modified

kolab kolab groupware server DOWNGRADE

Affected: 2.0.0 · 2.0.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.0

1. Check installed version

apt-cache policy kolab-groupware-server || rpm -q kolab-groupware-server || kolab-groupware-server --version

2. No fixed release: DOWNGRADE to a release before 2.0.0 (Debian / Ubuntu)

apt-cache madison kolab-groupware-server sudo apt install kolab-groupware-server=<VERSION_BEFORE_2.0.0> sudo apt-mark hold kolab-groupware-server

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

dnf --showduplicates list kolab-groupware-server sudo dnf downgrade kolab-groupware-server-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add kolab-groupware-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-2005-4828?

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

Is CVE-2005-4828 being exploited?

CVE-2005-4828 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-2005-4828 affect?

CVE-2005-4828 affects kolab groupware server. Severity is medium (CVSS 6.4). Kolab Server 2.0.0 and 2.0.1 does not properly handle when a large email is sent with a "." in the wrong place, which causes kolabfilter to add another ".", which might break clear-text signatures and attachments. NOTE: it is not clear whe

How urgent is CVE-2005-4828?

Priority 45/100. Public exploit reference

Related CVEs

CVE-2008-4165 MEDIUM 4.0 DOWNGRADE admin/user/create_user.php in Kolab Groupware Server 1.0.0 places a user password in an HTTP GET request, whic
CVE-2006-0213 MEDIUM 4.6 UPGRADE Kolab Server 2.0.1, 2.0.2 and development versions pre-2.1-20051215 and earlier, when authenticating users via
CVE-2004-1997 MEDIUM 4.6 DOWNGRADE DOWNGRADE Kolab stores OpenLDAP passwords in plaintext in the slapd.conf file, which may be installed world-readable, wh

References

← Back to latest CVEs