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CVE-2004-0004

20
FAUCET Score

CVE-2004-0004 describes a critical vulnerability in OpenCA 0.9.1.6 and earlier, specifically within the libCheckSignature function of crypto-utils.lib. This flaw allows remote attackers to spoof requests from other users by exploiting an insufficient certificate validation process that only compares the serial number of the signer's certificate. The vulnerability carries a CVSS score of 7.5 (High), indicating a network-based attack with low complexity, requiring no authentication, and potentially leading to partial confidentiality, integrity, and availability impacts. Despite its severity, there is no known active exploitation, publicly available exploit code, or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 0.9.1.6CPE matchmatch criteria
cpe:2.3:a:openca:openca:*:*:*:*:*:*:*:*

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
2.09%
Probability of exploitation in next 30 days
EPSS Percentile
79.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0209 is in the 64th percentile among its peer group of 51,466 CVEs.

Social Chatter

No social media mentions found for this CVE.

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

marc.info
exchange.xforce.ibmcloud.com / vulnerabilities/14847
kb.cert.org / vuls/id/336446
US Government Resource
openca.org / news/CAN-2004-0004.txt
PatchVendor Advisory
osvdb.org / 3615
securityfocus.com / bid/9435
PatchVendor Advisory