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CVE-2002-0518

19
FAUCET Score

CVE-2002-0518 describes a denial-of-service vulnerability in FreeBSD 4.5 and earlier, affecting its SYN cache and SYN cookie mechanisms. An attacker could crash the system by sending a crafted SYN packet that triggers a null pointer dereference, or by repeatedly killing and restarting a listening process. This vulnerability has a CVSS score of 5.0, indicating a medium severity with low attack complexity and potential for partial availability impact. While there are no known public exploits or Metasploit modules, the vulnerability has garnered significant community discussion with 10 mentions.

Impacted Technologies

VendorProductVersion(s)CPE
4.5CPE matchmatch criteria
cpe:2.3:o:freebsd:freebsd:4.5:release:*:*:*:*:*:*
4.5CPE matchmatch criteria
cpe:2.3:o:freebsd:freebsd:4.5:stable:*:*:*:*:*:*

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
2.47%
Probability of exploitation in next 30 days
EPSS Percentile
82.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0247 is in the 74th percentile among its peer group of 23,701 CVEs.

Social Chatter

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-02:20.syncache.asc
iss.net / security_center/static/8873.php
iss.net / security_center/static/8875.php
PatchVendor Advisory
osvdb.org / 6046
securityfocus.com / bid/4524
PatchVendor Advisory