CVE-2003-0220
HighPublic exploitBuffer overflow in the administrator authentication process for Kerio Personal Firewall (KPF) 2.1.4 and earlier allows remote attackers to execute arbitrary code via a handshake packet.
Published May 12, 2003 · Updated Apr 15, 2026
Key Facts
Patch immediately- CVE-2003-0220 is a high-severity vulnerability (CVSS 7.5 v2) affecting Personal Firewall 2 (Kerio).
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 69% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v2
7.5
AV:N/AC:L/Au:N/C:P/I:P/A:P
EPSS (30-day exploit likelihood)
69%
Higher than 99.3% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
Available
Proof-of-concept or weaponized module
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Description
Buffer overflow in the administrator authentication process for Kerio Personal Firewall (KPF) 2.1.4 and earlier allows remote attackers to execute arbitrary code via a handshake packet.
Affected Products
5 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Personal Firewall 2Kerio | 2.1, 2.1.1, 2.1.2, 2.1.3, 2.1.4 | n/a |
Timeline
Publicly disclosed
May 12, 2003
Last updated
Apr 15, 2026
References
- patchhttp://www.coresecurity.com/common/showdoc.php?idx=314&idxseccion=10
- exploitMSF kerio_auth.rb
- exploitExploitDB-1537
- exploitExploitDB-16465
- exploitExploitDB-22417
FAQ
Common Questions.
Buffer overflow in the administrator authentication process for Kerio Personal Firewall (KPF) 2.1.4 and earlier allows remote attackers to execute arbitrary code via a handshake packet.
Affected: Personal Firewall 2 (Kerio) versions 2.1, 2.1.1, 2.1.2, 2.1.3, 2.1.4. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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