HOMEVULNERABILITIESCVE-2017-13704
HIGH

CVE-2017-13704

CWE-20Published: October 3, 2017· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

In dnsmasq before 2.78, if the DNS packet size does not match the expected size, the size parameter in a memset call gets a negative value. As it is an unsigned value, memset ends up writing up to 0xffffffff zero's (0xffffffffffffffff in 64 bit platforms), making dnsmasq crash.

NVD Source

Technical Analysis

CVE-2017-13704 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

Canonical1 product(s)
ubuntu linux
Debian1 product(s)
debian linux
Fedora1 product(s)
fedora
novell1 product(s)
leap
Red Hat3 product(s)
enterprise linux desktopenterprise linux serverenterprise linux workstation
thekelleys1 product(s)
dnsmasq
Source: NVD CPE · 13 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

ADVISORYhttp://thekelleys.org.uk/dnsmasq/CHANGELOG
ADVISORYhttp://www.securityfocus.com/bid/101085
ADVISORYhttp://www.securitytracker.com/id/1039474
ADVISORYhttps://access.redhat.com/security/vulnerabilities/3199382
ADVISORYhttps://security.googleblog.com/2017/10/behind-masq-yet-more-dns-and-dhcp.html
ADVISORYhttp://thekelleys.org.uk/dnsmasq/CHANGELOG
ADVISORYhttp://www.securityfocus.com/bid/101085
ADVISORYhttp://www.securitytracker.com/id/1039474
ADVISORYhttps://access.redhat.com/security/vulnerabilities/3199382
ADVISORYhttps://security.googleblog.com/2017/10/behind-masq-yet-more-dns-and-dhcp.html

All References (24)

→
http://thekelleys.org.uk/dnsmasq/CHANGELOGRelease Notes · Vendor Advisory
→
http://thekelleys.org.uk/gitweb/?p=dnsmasq.git%3Ba=commit%3Bh=63437ffbb58837b214b4b92cb1c54bc5f3279928
→
http://www.securityfocus.com/bid/101085Third Party Advisory · VDB Entry
→
http://www.securityfocus.com/bid/101977
→
http://www.securitytracker.com/id/1039474Third Party Advisory · VDB Entry
→
https://access.redhat.com/security/vulnerabilities/3199382Issue Tracking · Third Party Advisory
→
https://cert-portal.siemens.com/productcert/pdf/ssa-689071.pdf
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4TK6DWC53WSU6633EVZL7H4PCWBYHMHK/
→
https://security.googleblog.com/2017/10/behind-masq-yet-more-dns-and-dhcp.htmlThird Party Advisory
→
https://www.mail-archive.com/dnsmasq-discuss%40lists.thekelleys.org.uk/msg11664.html
→
https://www.mail-archive.com/dnsmasq-discuss%40lists.thekelleys.org.uk/msg11665.html
→
https://www.synology.com/support/security/Synology_SA_17_59_Dnsmasq
→
http://thekelleys.org.uk/dnsmasq/CHANGELOGRelease Notes · Vendor Advisory
→
http://thekelleys.org.uk/gitweb/?p=dnsmasq.git%3Ba=commit%3Bh=63437ffbb58837b214b4b92cb1c54bc5f3279928
→
http://www.securityfocus.com/bid/101085Third Party Advisory · VDB Entry

Quick Facts

CVE IDCVE-2017-13704
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-20
CISA KEVNo
Affected6 vendor(s)
PublishedOct 3, 2017

Related CVEs (CWE-20)

CVE-2007-6176
10.0
CVE-2008-1331
10.0
CVE-2007-6494
10.0
CVE-2003-1425
10.0
CVE-2008-6826
10.0
CVE-2008-6555
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2017-13704 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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