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CVE-2003-1491

21
FAUCET Score

CVE-2003-1491 describes a vulnerability in Kerio Personal Firewall (KPF) version 2.1.4, where a default rule allowing incoming DNS traffic (UDP port 53) can be abused. Remote attackers can bypass firewall filters by crafting packets with a source port of 53. This vulnerability has a CVSS score of 7.5, indicating high severity due to its network-based attack vector, low attack complexity, and potential for partial compromise of confidentiality, integrity, and availability. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
2.1.4CPE matchmatch criteria
cpe:2.3:a:kerio:personal_firewall:2.1.4:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.5HIGH

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

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
6.4
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.37%
Probability of exploitation in next 30 days
EPSS Percentile
82.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0237 is in the 68th percentile among its peer group of 51,506 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

archives.neohapsis.com / archives/fulldisclosure/2003-q2/0352.html
exchange.xforce.ibmcloud.com / vulnerabilities/11880
securiteam.com / securitynews/5FP0N1P9PI.html
securityfocus.com / bid/7436