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CVE-2016-6173

20
FAUCET Score

CVE-2016-6173 describes a denial-of-service vulnerability in NSD before version 4.1.11, where a remote DNS master server can exhaust disk space in /tmp and crash a slave server through an unlimited data zone transfer. This vulnerability carries a high CVSS score of 7.5, indicating a network-based attack with low complexity and high impact on availability, requiring no user interaction or privileges. While the FAUCET Risk Score is 59/100, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 4.1.10CPE matchmatch criteria
cpe:2.3:a:nlnetlabs:nsd:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.92%
Probability of exploitation in next 30 days
EPSS Percentile
85.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0292 is in the 74th percentile among its peer group of 51,506 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

Remediation records are not available for this CVE.

References

github.com / sischkg/xfer-limit/blob/master/README.md
Third Party Advisory
lists.dns-oarc.net / pipermail/dns-operations/2016-July/015058.html
Third Party Advisory
open.nlnetlabs.nl / pipermail/nsd-users/2016-August/002342.html
Release NotesVendor Advisory
nlnetlabs.nl / bugs-script/show_bug.cgi
Issue Tracking
nlnetlabs.nl / svn/nsd/tags/NSD_4_1_11_REL/doc/RELNOTES
Release NotesVendor Advisory
openwall.com / lists/oss-security/2016/07/06/3
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2016/07/06/4
Mailing ListThird Party Advisory
securityfocus.com / bid/91678
Third Party AdvisoryVDB Entry