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CVE-2006-0433

16
FAUCET Score

CVE-2006-0433 describes a denial-of-service vulnerability affecting FreeBSD versions 5.3 and 5.4. The flaw lies in the Selective Acknowledgement (SACK) mechanism, where improper handling of incoming SACKs under low memory conditions can lead to an infinite loop. This vulnerability has a CVSS score of 5.0, indicating a medium severity, with a low attack complexity and no authentication required, allowing remote attackers to disrupt system availability. There is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage regarding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
5.3CPE matchmatch criteria
cpe:2.3:o:freebsd:freebsd:5.3:*:*:*:*:*:*:*
5.4CPE matchmatch criteria
cpe:2.3:o:freebsd:freebsd:5.4:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

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

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.88%
Probability of exploitation in next 30 days
EPSS Percentile
85.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0288 is in the 79th percentile among its peer group of 23,723 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, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

ftp.freebsd.org / pub/FreeBSD/CERT/advisories/FreeBSD-SA-06:08.sack.asc
secunia.com / advisories/18696
securityreason.com / securityalert/399
securitytracker.com / id
exchange.xforce.ibmcloud.com / vulnerabilities/24453
osvdb.org / 22861
Patch
securityfocus.com / bid/16466
vupen.com / english/advisories/2006/0409