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CVE-2004-0640

26
FAUCET Score

CVE-2004-0640 describes a critical format string vulnerability within the SSL_set_verify function of SSLtelnetd 0.13, affecting various Netkit and SSLtelnetd distributions. This flaw allows unauthenticated remote attackers to execute arbitrary code on vulnerable systems. With a CVSS score of 10.0, it represents a severe risk due to its network-based attack vector, low 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 databases like Metasploit or ExploitDB, or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
0.17CPE matchmatch criteria
cpe:2.3:a:netkit:linux_netkit:0.17:*:*:*:*:*:*:*
0.17.17CPE matchmatch criteria
cpe:2.3:a:netkit:linux_netkit:0.17.17:*:*:*:*:*:*:*
0.13.1CPE matchmatch criteria
cpe:2.3:a:ssltelnetd:secure_telnet:0.13.1:*:*:*:*:*:*:*

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
4.49%
Probability of exploitation in next 30 days
EPSS Percentile
90.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0449 is in the 83rd 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

Patch Available

Vendor Patches (1)

debianpatch availablevia nvd_reference
View patch

References

exchange.xforce.ibmcloud.com / vulnerabilities/16653
debian.org / security/2004/dsa-529
PatchVendor Advisory
idefense.com / application/poi/display