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CVE-1999-0305

15
FAUCET Score

CVE-1999-0305 describes a vulnerability in the sysctl facility of OpenBSD 2.2 and earlier, and FreeBSD 2.2.5 and earlier, that fails to properly restrict source-routed packets, even when relevant security variables are enabled. This flaw allows remote attackers to spoof TCP connections. The vulnerability has a CVSS score of 5.0 (Medium), indicating a network-based attack with low complexity, requiring no authentication, and potentially leading to partial confidentiality impact. Its EPSS score is very low, suggesting a minimal likelihood of exploitation. There is no evidence of active exploitation, and no public exploit code is available on platforms like Metasploit, Nuclei, or ExploitDB. The CVE has garnered no community discussion or media coverage, aligning with the typical low engagement for many older vulnerabilities.

Impacted Technologies

VendorProductVersion(s)CPE
All Versions ImpactedCPE matchmatch criteria
cpe:2.3:o:bsdi:bsd_os:*:*:*:*:*:*:*:*
2.2CPE matchmatch criteria
cpe:2.3:o:freebsd:freebsd:2.2:*:*:*:*:*:*:*
2.2.5CPE matchmatch criteria
cpe:2.3:o:freebsd:freebsd:2.2.5:*:*:*:*:*:*:*
2.0CPE matchmatch criteria
cpe:2.3:o:openbsd:openbsd:2.0:*:*:*:*:*:*:*
2.1CPE matchmatch criteria
cpe:2.3:o:openbsd:openbsd:2.1:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

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

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

Exploit Intelligence

EPSS Score
1.38%
Probability of exploitation in next 30 days
EPSS Percentile
69.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0138 is in the 50th percentile among its peer group of 23,725 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

exchange.xforce.ibmcloud.com / vulnerabilities/736
openbsd.org / advisories/sourceroute.txt
osvdb.org / 11502