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CVE-2004-0765

19
FAUCET Score

CVE-2004-0765 describes a vulnerability in Mozilla, Firefox, and Thunderbird where the cert_TestHostName function inadequately validates certificate hostnames. Specifically, it fails to properly check the hostname when the URI's hostname is not a fully qualified domain name, enabling remote attackers to spoof trusted certificates. This vulnerability has a CVSS score of 7.5 (High), indicating a network-based attack with low complexity, potentially leading to compromise of confidentiality, integrity, and availability. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 0.9CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
<= 1.7CPE matchmatch criteria
cpe:2.3:a:mozilla:mozilla:*:*:*:*:*:*:*:*
<= 0.7CPE matchmatch criteria
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*

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
1.03%
Probability of exploitation in next 30 days
EPSS Percentile
60.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0103 is in the 37th percentile among its peer group of 51,506 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

Patch Available

Vendor Patches (1)

mozillapatch availablevia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2004-0765Low

security flaw

Feb 12, 2004

References

bugzilla.mozilla.org / show_bug.cgi
PatchVendor Advisory
marc.info
exchange.xforce.ibmcloud.com / vulnerabilities/16868
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11162
mozilla.org / projects/security/known-vulnerabilities.html
novell.com / linux/security/advisories/2004_36_mozilla.html
Vendor Advisory
redhat.com / support/errata/RHSA-2004-421.html
PatchVendor Advisory