HOMEVULNERABILITIESCVE-2017-14496
HIGHPOC

CVE-2017-14496

CWE-191Published: October 3, 2017· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

Integer underflow in the add_pseudoheader function in dnsmasq before 2.78 , when the --add-mac, --add-cpe-id or --add-subnet option is specified, allows remote attackers to cause a denial of service via a crafted DNS request.

NVD Source

Technical Analysis

CVE-2017-14496 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.

A proof-of-concept (PoC) exploit exists for CVE-2017-14496. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.

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
Google1 product(s)
android
novell1 product(s)
leap
Red Hat3 product(s)
enterprise linux desktopenterprise linux serverenterprise linux workstation
thekelleys1 product(s)
dnsmasq
Source: NVD CPE · 21 total CPE entries

Exploit & PoC Resources

POC AVAILABLEProof-of-concept code exists
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

PATCHhttps://access.redhat.com/errata/RHSA-2017:2836
PATCHhttps://access.redhat.com/errata/RHSA-2017:2836
ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2017-10/msg00006.html
ADVISORYhttp://thekelleys.org.uk/dnsmasq/CHANGELOG
ADVISORYhttp://www.debian.org/security/2017/dsa-3989
ADVISORYhttp://www.securityfocus.com/bid/101085
ADVISORYhttp://www.securitytracker.com/id/1039474
ADVISORYhttp://www.ubuntu.com/usn/USN-3430-1
ADVISORYhttp://www.ubuntu.com/usn/USN-3430-2
ADVISORYhttps://access.redhat.com/security/vulnerabilities/3199382
ADVISORYhttps://security.googleblog.com/2017/10/behind-masq-yet-more-dns-and-dhcp.html
ADVISORYhttps://source.android.com/security/bulletin/2017-10-01
ADVISORYhttps://www.exploit-db.com/exploits/42946/
ADVISORYhttps://www.kb.cert.org/vuls/id/973527
ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2017-10/msg00006.html
ADVISORYhttp://thekelleys.org.uk/dnsmasq/CHANGELOG
ADVISORYhttp://www.debian.org/security/2017/dsa-3989
ADVISORYhttp://www.securityfocus.com/bid/101085
ADVISORYhttp://www.securitytracker.com/id/1039474
ADVISORYhttp://www.ubuntu.com/usn/USN-3430-1
ADVISORYhttp://www.ubuntu.com/usn/USN-3430-2
ADVISORYhttps://access.redhat.com/security/vulnerabilities/3199382
ADVISORYhttps://security.googleblog.com/2017/10/behind-masq-yet-more-dns-and-dhcp.html
ADVISORYhttps://source.android.com/security/bulletin/2017-10-01
ADVISORYhttps://www.exploit-db.com/exploits/42946/
ADVISORYhttps://www.kb.cert.org/vuls/id/973527

All References (44)

→
http://lists.opensuse.org/opensuse-security-announce/2017-10/msg00006.htmlIssue Tracking · Mailing List · Third Party Advisory
→
http://nvidia.custhelp.com/app/answers/detail/a_id/4561
→
http://thekelleys.org.uk/dnsmasq/CHANGELOGRelease Notes · Vendor Advisory
→
http://thekelleys.org.uk/gitweb/?p=dnsmasq.git%3Ba=commit%3Bh=897c113fda0886a28a986cc6ba17bb93bd6cb1c7
→
http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2017-005.txt
→
http://www.debian.org/security/2017/dsa-3989Third Party Advisory
→
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
→
http://www.ubuntu.com/usn/USN-3430-1Third Party Advisory
→
http://www.ubuntu.com/usn/USN-3430-2Third Party Advisory
→
https://access.redhat.com/errata/RHSA-2017:2836Patch · Third Party Advisory
→
https://access.redhat.com/security/vulnerabilities/3199382Issue Tracking · Third Party Advisory
→
https://cert-portal.siemens.com/productcert/pdf/ssa-689071.pdf
→
https://security.gentoo.org/glsa/201710-27

Quick Facts

CVE IDCVE-2017-14496
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-191
CISA KEVNo
ExploitPOC
Affected6 vendor(s)
PublishedOct 3, 2017

Related CVEs (CWE-191)

CVE-2007-0063
10.0
CVE-2015-2311
9.8
CVE-2016-10166
9.8
CVE-2017-9214
9.8
CVE-2017-8911
9.8
CVE-2017-11757
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2017-14496 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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