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CVE-2004-0903

34
FAUCET Score

CVE-2004-0903 is a critical stack-based buffer overflow vulnerability in Mozilla Firefox (before Preview Release), Mozilla (before 1.7.3), and Thunderbird (before 0.8), specifically within the writeGroup function in nsVCardObj.cpp. This flaw allows remote attackers to execute arbitrary code by sending malformed VCard attachments that are not properly handled during message preview. With a CVSS score of 10.0, it represents a severe risk, requiring no authentication and having a low attack complexity, leading to complete compromise of confidentiality, integrity, and availability. While there is no evidence of active exploitation (KEV listed as No) and no public exploit code (Metasploit, Nuclei, ExploitDB are none), the vulnerability has garnered significant community discussion with over 10 mentions, indicating awareness and potential interest.

Impacted Technologies

VendorProductVersion(s)CPE
1.7CPE matchmatch criteria
cpe:2.3:a:mozilla:mozilla:1.7:*:*:*:*:*:*:*
1.7.1CPE matchmatch criteria
cpe:2.3:a:mozilla:mozilla:1.7.1:*:*:*:*:*:*:*
1.7.2CPE matchmatch criteria
cpe:2.3:a:mozilla:mozilla:1.7.2:*:*:*:*:*:*:*
0.7CPE matchmatch criteria
cpe:2.3:a:mozilla:thunderbird:0.7:*:*:*:*:*:*:*
0.7.1CPE matchmatch criteria
cpe:2.3:a:mozilla:thunderbird:0.7.1:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

10.0HIGH

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

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

Exploit Intelligence

EPSS Score
9.75%
Probability of exploitation in next 30 days
EPSS Percentile
95.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0975 is in the 92nd 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

Vendor Patches (1)

mozillavendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2004-0903Important

security flaw

Aug 29, 2004

References

bugzilla.mozilla.org / show_bug.cgi
Vendor Advisory
marc.info
marc.info
security.gentoo.org / glsa/glsa-200409-26.xml
exchange.xforce.ibmcloud.com / vulnerabilities/17380
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10873
kb.cert.org / vuls/id/414240
Third Party AdvisoryUS Government Resource
mozilla.org / projects/security/known-vulnerabilities.html
novell.com / linux/security/advisories/2004_36_mozilla.html
securityfocus.com / bid/11174
Vendor Advisory
us-cert.gov / cas/techalerts/TA04-261A.html
US Government Resource