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CVE-2016-6559

32
FAUCET Score

CVE-2016-6559 is a critical vulnerability affecting FreeBSD, stemming from improper bounds checking in the link_ntoa() function within the BSD libc library. This flaw could allow an attacker to read or write to memory, potentially leading to severe compromise (CVSS 9.8 Critical). Despite its high severity score, exploitation is considered highly unlikely as applications rarely use the function in an exploitable manner. There are no known exploits, proof-of-concepts, or active exploitation, and it has received no community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
9.3CPE matchmatch criteria
cpe:2.3:o:freebsd:freebsd:9.3:*:*:*:*:*:*:*
10.1CPE matchmatch criteria
cpe:2.3:o:freebsd:freebsd:10.1:*:*:*:*:*:*:*
10.2CPE matchmatch criteria
cpe:2.3:o:freebsd:freebsd:10.2:*:*:*:*:*:*:*
10.3CPE matchmatch criteria
cpe:2.3:o:freebsd:freebsd:10.3:*:*:*:*:*:*:*
11.0CPE matchmatch criteria
cpe:2.3:o:freebsd:freebsd:11.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
3.70%
Probability of exploitation in next 30 days
EPSS Percentile
88.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0370 is in the 81st percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

freebsd.org / security/advisories/FreeBSD-SA-16:37.libc.asc
Vendor Advisory
kb.cert.org / vuls/id/548487
Third Party AdvisoryUS Government Resource
securityfocus.com / bid/94694
Third Party AdvisoryVDB Entry
securitytracker.com / id/1037398
Third Party AdvisoryVDB Entry