HOMEVULNERABILITIESCVE-2019-9747
HIGH

CVE-2019-9747

CWE-835Published: March 13, 2019· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

In tinysvcmdns through 2018-01-16, a maliciously crafted mDNS (Multicast DNS) packet triggers an infinite loop while parsing an mDNS query. When mDNS compressed labels point to each other, the function uncompress_nlabel goes into an infinite loop trying to analyze the packet with an mDNS query. As a result, the mDNS server hangs after receiving the malicious mDNS packet. NOTE: the product's web site states "This project is un-maintained, and has been since 2013. ... There are known vulnerabilities ... You are advised to NOT use this library for any new projects / products."

NVD Source

Technical Analysis

CVE-2019-9747 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

tinysvcmdns_project1 product(s)
tinysvcmdns
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://bitbucket.org/geekman/tinysvcmdns/issues/11/denial-of-service-vulnerability-infinite
ADVISORYhttps://bitbucket.org/geekman/tinysvcmdns/issues/11/denial-of-service-vulnerability-infinite

All References (2)

→
https://bitbucket.org/geekman/tinysvcmdns/issues/11/denial-of-service-vulnerability-infiniteExploit · Third Party Advisory
→
https://bitbucket.org/geekman/tinysvcmdns/issues/11/denial-of-service-vulnerability-infiniteExploit · Third Party Advisory

Quick Facts

CVE IDCVE-2019-9747
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-835
CISA KEVNo
Affected1 vendor(s)
PublishedMar 13, 2019

Related CVEs (CWE-835)

CVE-2017-12990
9.8
CVE-2017-12995
9.8
CVE-2018-20784
9.8
CVE-2017-12997
9.8
CVE-2021-42143
9.1
CVE-2024-43366
9.1

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2019-9747 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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