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CVE-2006-6554

16
FAUCET Score

CVE-2006-6554 describes an unspecified vulnerability in Kerio MailServer versions prior to 6.3.1, allowing remote attackers to trigger a denial of service. By sending specially crafted, long LDAP queries, an attacker can cause a segmentation fault and stop the mail server service. This vulnerability has a CVSS score of 5.0, indicating a medium severity, with a network-based attack vector requiring low attack complexity and resulting in partial availability impact. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this decade-old vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
<= 6.3.0CPE matchmatch criteria
cpe:2.3:a:kerio:kerio_mailserver:*:*:*:*:*:*:*:*
5.0CPE matchmatch criteria
cpe:2.3:a:kerio:kerio_mailserver:5.0:*:*:*:*:*:*:*
5.1CPE matchmatch criteria
cpe:2.3:a:kerio:kerio_mailserver:5.1:*:*:*:*:*:*:*
5.1.1CPE matchmatch criteria
cpe:2.3:a:kerio:kerio_mailserver:5.1.1:*:*:*:*:*:*:*
5.6.3CPE matchmatch criteria
cpe:2.3:a:kerio:kerio_mailserver:5.6.3:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

AV:N/AC:L/Au:N/C:N/I:N/A:P

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
1.51%
Probability of exploitation in next 30 days
EPSS Percentile
71.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0151 is in the 55th percentile among its peer group of 23,725 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

secunia.com / advisories/23364
PatchVendor Advisory
exchange.xforce.ibmcloud.com / vulnerabilities/30872
kerio.com / kms_history.html
Patch
securityfocus.com / archive/1/454455/100/0/threaded
vupen.com / english/advisories/2006/4993
Vendor Advisory