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CVE-2019-14513

Improper bounds checking in Dnsmasq before 2.76 allows an attacker controlled DNS server to send...

7.5 HighFix available

Improper bounds checking in Dnsmasq before 2.76 allows an attacker controlled DNS server to send large DNS packets that result in a read operation beyond the buffer allocated for the packet, a different vulnerability than CVE-2017-14491.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

1.70%Up 1.1 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 7.5

Improper bounds checking in Dnsmasq before 2.76 allows an attacker controlled DNS server to send large DNS packets that result in a read operation beyond the buffer allocated for the packet, a different vulnerability than CVE-2017-14491.

Record
CVE-2019-14513
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness
CWE-125
Updated
2026-11-02
CVE List No score

Improper bounds checking in Dnsmasq before 2.76 allows an attacker controlled DNS server to send large DNS packets that result in a read operation beyond the buffer allocated for the packet, a different vulnerability than CVE-2017-14491.

Record
CVE-2019-14513
Updated
2026-11-02
EUVDEUVD-2019-5688 No score

Improper bounds checking in Dnsmasq before 2.76 allows an attacker controlled DNS server to send large DNS packets that result in a read operation beyond the buffer allocated for the packet, a different vulnerability than CVE-2017-14491.

Record
EUVD-2019-5688
Updated
2026-11-03
GitHub AdvisoriesGHSA-8x2j-2xxw-g7h5 7.5

Improper bounds checking in Dnsmasq before 2.76 allows an attacker controlled DNS server to send...

Improper bounds checking in Dnsmasq before 2.76 allows an attacker controlled DNS server to send large DNS packets that result in a read operation beyond the buffer allocated for the packet, a different vulnerability than CVE-2017-14491.

Record
GHSA-8x2j-2xxw-g7h5
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-125
Updated
2026-11-02
OSV 7.5

Improper bounds checking in Dnsmasq before 2.76 allows an attacker controlled DNS server to send large DNS packets that result in a read operation beyond the buffer allocated for the packet, a different vulnerability than CVE-2017-14491.

Record
CVE-2019-14513
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2019-14513 7.5

Improper bounds checking in Dnsmasq before 2.76 allows an attacker controlled DNS server to send large DNS packets that result in a read operation beyond the buffer allocated for the packet, a different vulnerability than CVE-2017-14491.

Record
DEBIAN-CVE-2019-14513
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRHBA-2017:2117 5.3

Red Hat Bug Fix Advisory: dnsmasq bug fix and enhancement update

Record
RHBA-2017:2117
CVSS 3.0
5.3 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated
2026-11-02
OSVUBUNTU-CVE-2019-14513 7.5

Improper bounds checking in Dnsmasq before 2.76 allows an attacker controlled DNS server to send large DNS packets that result in a read operation beyond the buffer allocated for the packet, a different vulnerability than CVE-2017-14491.

Record
UBUNTU-CVE-2019-14513
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUSN-4924-1 No score

dnsmasq vulnerabilities

It was discovered that Dnsmasq incorrectly handled certain wildcard synthesized NSEC records. A remote attacker could possibly use this issue to prove the non-existence of hostnames that actually exist. (CVE-2017-15107)

It was discovered that Dnsmasq incorrectly handled certain large DNS packets. A remote attacker could possibly use this issue to cause Dnsmasq to crash, resulting in a denial of service. (CVE-2019-14513)

Record
USN-4924-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
dnsmasq
Debian:12
 before 2.76-1
2.76-1
dnsmasq
Debian:13
 before 2.76-1
2.76-1
dnsmasq
Debian:14
 before 2.76-1
2.76-1
dnsmasq
Debian:8
 before 2.72-3+deb8u5, plus listed versions
2.72-32.72-3+deb8u12.72-3+deb8u22.72-3+deb8u32.72-3+deb8u4
2.72-3+deb8u5
dnsmasq-debuginfo
Red Hat:enterprise_linux:7::client
 before 0:2.76-2.el7
0:2.76-2.el7
dnsmasq-utils
Red Hat:enterprise_linux:7::client
 before 0:2.76-2.el7
0:2.76-2.el7
dnsmasq
Red Hat:enterprise_linux:7::client
 before 0:2.76-2.el7
0:2.76-2.el7
dnsmasq-debuginfo
Red Hat:enterprise_linux:7::computenode
 before 0:2.76-2.el7
0:2.76-2.el7
dnsmasq-utils
Red Hat:enterprise_linux:7::computenode
 before 0:2.76-2.el7
0:2.76-2.el7
dnsmasq
Red Hat:enterprise_linux:7::computenode
 before 0:2.76-2.el7
0:2.76-2.el7
Show 9 moreShow less
Affected packages
PackageAffectedFixed
dnsmasq-debuginfo
Red Hat:enterprise_linux:7::server
 before 0:2.76-2.el7
0:2.76-2.el7
dnsmasq-utils
Red Hat:enterprise_linux:7::server
 before 0:2.76-2.el7
0:2.76-2.el7
dnsmasq
Red Hat:enterprise_linux:7::server
 before 0:2.76-2.el7
0:2.76-2.el7
dnsmasq-debuginfo
Red Hat:enterprise_linux:7::workstation
 before 0:2.76-2.el7
0:2.76-2.el7
dnsmasq-utils
Red Hat:enterprise_linux:7::workstation
 before 0:2.76-2.el7
0:2.76-2.el7
dnsmasq
Red Hat:enterprise_linux:7::workstation
 before 0:2.76-2.el7
0:2.76-2.el7
dnsmasq
Ubuntu:Pro:14.04:LTS
 All versions, plus listed versions
2.66-4ubuntu12.67-12.68-12.68-1ubuntu0.12.68-1ubuntu0.2
Show 5 moreShow less
2.68-1ubuntu0.2+esm12.68-1ubuntu0.2+esm22.68-1ubuntu0.2+esm32.68-1ubuntu0.2+esm52.68-1ubuntu0.2+esm6
 None known
dnsmasq
Ubuntu:16.04:LTS
 before 2.75-1ubuntu0.16.04.10, plus listed versions
2.75-12.75-1ubuntu0.16.04.12.75-1ubuntu0.16.04.22.75-1ubuntu0.16.04.32.75-1ubuntu0.16.04.42.75-1ubuntu0.16.04.52.75-1ubuntu0.16.04.72.75-1ubuntu0.16.04.8
2.75-1ubuntu0.16.04.10
dnsmasq
Ubuntu:16.04:LTS
From an advisory covering 2 CVEs
 before 2.75-1ubuntu0.16.04.10, plus listed versions
2.75-12.75-1ubuntu0.16.04.12.75-1ubuntu0.16.04.22.75-1ubuntu0.16.04.32.75-1ubuntu0.16.04.42.75-1ubuntu0.16.04.52.75-1ubuntu0.16.04.72.75-1ubuntu0.16.04.8
2.75-1ubuntu0.16.04.10

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2019-14513 is a high vulnerability (CVSS 7.5) in Thekelleys Dnsmasq, published August 1, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.70%, the 77th percentile. Fixed in dnsmasq 2.76-1.

References

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