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CVE-2006-6603

27
FAUCET Score

CVE-2006-6603 describes a critical buffer overflow vulnerability in the YMMAPI.YMailAttach ActiveX control (ymmapi.dll) within Yahoo! Messenger versions prior to 2005.1.1.4. This flaw allows remote attackers to execute arbitrary code on a victim's system through a specially crafted HTML document. With a CVSS score of 9.3, it represents a high-severity risk due to its network-based attack vector, medium attack complexity, and complete compromise of confidentiality, integrity, and availability. Despite its age and high severity, there is no evidence of active exploitation, publicly available exploit code in common repositories like Metasploit or ExploitDB, nor significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 8.0CPE matchmatch criteria
cpe:2.3:a:yahoo:messenger:*:*:*:*:*:*:*:*
5.0CPE matchmatch criteria
cpe:2.3:a:yahoo:messenger:5.0:*:*:*:*:*:*:*
5.5CPE matchmatch criteria
cpe:2.3:a:yahoo:messenger:5.5:*:*:*:*:*:*:*
5.6CPE matchmatch criteria
cpe:2.3:a:yahoo:messenger:5.6:*:*:*:*:*:*:*
6.0CPE matchmatch criteria
cpe:2.3:a:yahoo:messenger:6.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

9.3HIGH

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

Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
10.0
CvssVersion
2.0

Exploit Intelligence

EPSS Score
6.55%
Probability of exploitation in next 30 days
EPSS Percentile
93.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0655 is in the 68th percentile among its peer group of 8,915 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.2 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

messenger.yahoo.com / security_update.php
PatchVendor Advisory
secunia.com / advisories/23401
PatchVendor Advisory
securitytracker.com / id
Patch
kb.cert.org / vuls/id/901852
PatchUS Government Resource
securityfocus.com / bid/21607
Patch
vupen.com / english/advisories/2006/5016