dnsmasq: stack buffer overflow in the DHCPv6 code
Published Oct 2, 2017
9.8
CRITICALCVSS 3.0
EPSS 83.64%
Description
Stack-based buffer overflow in dnsmasq before 2.78 allows remote attackers to cause a denial of service (crash) or execute arbitrary code via a crafted DHCPv6 request.
Affected products
No data.
Configuration 1
- 14.04
- 16.04
- 17.04
- 7.0
- 7.1
- 9.0
- 42.2
- 42.3
- 7.0
- 7.0
- 7.0
Configuration 2
- ≤ 2.77
No data.
Red Hat Enterprise Linux 7
dnsmasq-0:2.76-2.el7_4.2
Fixed · RHSA-2017:2836
Red Hat Enterprise Linux 7.2 Extended Update Support
dnsmasq-0:2.66-14.el7_2.2
Fixed · RHSA-2017:2837
Red Hat Enterprise Linux 7.3 Extended Update Support
dnsmasq-0:2.66-21.el7_3.2
Fixed · RHSA-2017:2837
Red Hat Enterprise Linux 5
dnsmasq
Not affected
Red Hat Enterprise Linux 6
dnsmasq
Not affected
Red Hat Enterprise Linux OpenStack Platform 6 (Juno)
dnsmasq
Not affected
Red Hat Enterprise Linux OpenStack Platform 7 (Kilo)
dnsmasq
Not affected
Red Hat OpenStack Platform 10 (Newton)
dnsmasq
Not affected
Red Hat OpenStack Platform 11 (Ocata)
dnsmasq
Not affected
Red Hat OpenStack Platform 12 (Pike)
dnsmasq
Not affected
Red Hat OpenStack Platform 8 (Liberty)
dnsmasq
Not affected
Red Hat OpenStack Platform 9 (Mitaka)
dnsmasq
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | dnsmasq-0:2.76-2.el7_4.2 | Fixed | RHSA-2017:2836 |
| Red Hat Enterprise Linux 7.2 Extended Update Support | dnsmasq-0:2.66-14.el7_2.2 | Fixed | RHSA-2017:2837 |
| Red Hat Enterprise Linux 7.3 Extended Update Support | dnsmasq-0:2.66-21.el7_3.2 | Fixed | RHSA-2017:2837 |
| Red Hat Enterprise Linux 5 | dnsmasq | Not affected | n/a |
| Red Hat Enterprise Linux 6 | dnsmasq | Not affected | n/a |
| Red Hat Enterprise Linux OpenStack Platform 6 (Juno) | dnsmasq | Not affected | n/a |
| Red Hat Enterprise Linux OpenStack Platform 7 (Kilo) | dnsmasq | Not affected | n/a |
| Red Hat OpenStack Platform 10 (Newton) | dnsmasq | Not affected | n/a |
| Red Hat OpenStack Platform 11 (Ocata) | dnsmasq | Not affected | n/a |
| Red Hat OpenStack Platform 12 (Pike) | dnsmasq | Not affected | n/a |
| Red Hat OpenStack Platform 8 (Liberty) | dnsmasq | Not affected | n/a |
| Red Hat OpenStack Platform 9 (Mitaka) | dnsmasq | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Red Hat OpenStack Platform includes the dnsmasq-utils RPM which does not contain this flaw's affected code-paths; Red Hat OpenStack Platform is therefore listed as not affected. However, because all versions of Red Hat OpenStack Platform are based on Red Hat Enterprise Linux, all Red Hat OpenStack Platform users should absolutely upgrade the dnsmasq RPM from Red Hat Enterprise Linux as a matter of urgency using standard update mechanisms (such as 'yum update' or 'openstack overcloud update').
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AV:N/AC:L/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (61 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 83.64% (0.83638) | 99.68th | v5 (v2026.06.15) |
| Sep 22, 2026 | 83.64% (0.83638) | 99.67th | v5 (v2026.06.15) |
| Sep 21, 2026 | 78.88% (0.78881) | 99.59th | v5 (v2026.06.15) |
| Sep 6, 2026 | 83.64% (0.83638) | 99.67th | v5 (v2026.06.15) |
| Sep 5, 2026 | 78.88% (0.78881) | 99.58th | v5 (v2026.06.15) |
| Aug 30, 2026 | 83.64% (0.83638) | 99.67th | v5 (v2026.06.15) |
| Aug 28, 2026 | 78.88% (0.78881) | 99.58th | v5 (v2026.06.15) |
| Aug 24, 2026 | 83.64% (0.83638) | 99.66th | v5 (v2026.06.15) |
| Aug 23, 2026 | 78.88% (0.78881) | 99.58th | v5 (v2026.06.15) |
| Jun 15, 2026 | 83.64% (0.83638) | 99.65th | v5 (v2026.06.15) |
| Mar 4, 2026 | 5.62% (0.05615) | 90.16th | v4 (v2025.03.14) |
| Mar 1, 2026 | 12.00% (0.12004) | 93.66th | v4 (v2025.03.14) |
| Feb 4, 2026 | 5.62% (0.05615) | 90.11th | v4 (v2025.03.14) |
| Feb 1, 2026 | 12.00% (0.12004) | 93.62th | v4 (v2025.03.14) |
| Jan 4, 2026 | 5.62% (0.05615) | 90.05th | v4 (v2025.03.14) |
| Jan 1, 2026 | 12.00% (0.12004) | 93.58th | v4 (v2025.03.14) |
| Dec 4, 2025 | 5.62% (0.05615) | 89.98th | v4 (v2025.03.14) |
| Dec 1, 2025 | 12.00% (0.12004) | 93.54th | v4 (v2025.03.14) |
| Nov 4, 2025 | 5.62% (0.05615) | 89.90th | v4 (v2025.03.14) |
| Nov 1, 2025 | 12.00% (0.12004) | 93.52th | v4 (v2025.03.14) |
| Oct 4, 2025 | 5.62% (0.05615) | 89.92th | v4 (v2025.03.14) |
| Oct 1, 2025 | 12.00% (0.12004) | 93.55th | v4 (v2025.03.14) |
| Sep 4, 2025 | 5.62% (0.05615) | 89.99th | v4 (v2025.03.14) |
| Sep 1, 2025 | 12.00% (0.12004) | 93.56th | v4 (v2025.03.14) |
| Aug 4, 2025 | 5.62% (0.05615) | 89.98th | v4 (v2025.03.14) |
| Aug 1, 2025 | 12.00% (0.12004) | 93.53th | v4 (v2025.03.14) |
| Jul 5, 2025 | 5.62% (0.05615) | 89.89th | v4 (v2025.03.14) |
| Jul 1, 2025 | 12.00% (0.12004) | 93.48th | v4 (v2025.03.14) |
| Jun 6, 2025 | 5.62% (0.05615) | 89.84th | v4 (v2025.03.14) |
| Jun 1, 2025 | 12.00% (0.12004) | 93.42th | v4 (v2025.03.14) |
| May 4, 2025 | 5.62% (0.05615) | 89.80th | v4 (v2025.03.14) |
| May 1, 2025 | 12.00% (0.12004) | 93.40th | v4 (v2025.03.14) |
| Apr 17, 2025 | 5.90% (0.05895) | 90.05th | v4 (v2025.03.14) |
| Apr 16, 2025 | 12.55% (0.12550) | 93.52th | v4 (v2025.03.14) |
| Apr 15, 2025 | 5.90% (0.05895) | 90.03th | v4 (v2025.03.14) |
| Apr 14, 2025 | 12.55% (0.12550) | 93.35th | v4 (v2025.03.14) |
| Apr 5, 2025 | 5.90% (0.05895) | 89.71th | v4 (v2025.03.14) |
| Apr 4, 2025 | 12.55% (0.12550) | 93.35th | v4 (v2025.03.14) |
| Mar 30, 2025 | 5.90% (0.05895) | 89.65th | v4 (v2025.03.14) |
| Mar 29, 2025 | 30.22% (0.30222) | 94.75th | v4 (v2025.03.14) |
| Mar 28, 2025 | 5.90% (0.05895) | 89.67th | v4 (v2025.03.14) |
| Mar 27, 2025 | 30.22% (0.30222) | 96.02th | v4 (v2025.03.14) |
| Mar 20, 2025 | 25.21% (0.25214) | 95.76th | v4 (v2025.03.14) |
| Mar 19, 2025 | 30.22% (0.30222) | 96.09th | v4 (v2025.03.14) |
| Mar 17, 2025 | 25.21% (0.25214) | 95.73th | v4 (v2025.03.14) |
| Dec 17, 2024 | 63.76% (0.63761) | 98.00th | v3 (v2023.03.01) |
| Aug 13, 2024 | 13.68% (0.13677) | 95.71th | v3 (v2023.03.01) |
| Aug 10, 2024 | 26.92% (0.26916) | 96.84th | v3 (v2023.03.01) |
| Mar 28, 2024 | 13.68% (0.13677) | 95.49th | v3 (v2023.03.01) |
| Jan 6, 2024 | 12.06% (0.12059) | 94.84th | v3 (v2023.03.01) |
| Nov 8, 2023 | 11.33% (0.11330) | 94.63th | v3 (v2023.03.01) |
| Aug 12, 2023 | 4.54% (0.04538) | 91.44th | v3 (v2023.03.01) |
| Jul 18, 2023 | 3.25% (0.03254) | 89.93th | v3 (v2023.03.01) |
| Jul 8, 2023 | 3.05% (0.03050) | 89.60th | v3 (v2023.03.01) |
| May 8, 2023 | 4.40% (0.04400) | 91.10th | v3 (v2023.03.01) |
| Mar 7, 2023 | 4.14% (0.04144) | 90.84th | v3 (v2023.03.01) |
| Mar 6, 2023 | 72.98% (0.72976) | 99.26th | v2 (v2022.01.01) |
| Feb 4, 2022 | 72.98% (0.72976) | 99.11th | v2 (v2022.01.01) |
| Feb 3, 2022 | 35.63% (0.35627) | 97.92th | v1 |
| Sep 1, 2021 | 35.63% (0.35627) | 98.94th | v1 |
| Apr 14, 2021 | 35.63% (0.35627) | 0.00th | v1 |
References (24)
- http://lists.opensuse.org/opensuse-security-announce/2017-10/msg00006.html vendor-advisoryx_refsource_SUSEIssue TrackingMailing ListThird Party Advisory
- http://nvidia.custhelp.com/app/answers/detail/a_id/4561 x_refsource_CONFIRMThird Party Advisory
- http://thekelleys.org.uk/dnsmasq/CHANGELOG x_refsource_CONFIRMRelease NotesVendor Advisory
- http://thekelleys.org.uk/gitweb/?p=dnsmasq.git%3Ba=commit%3Bh=3d4ff1ba8419546490b464418223132529514033 x_refsource_CONFIRM
- http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2017-005.txt x_refsource_CONFIRM
- http://www.debian.org/security/2017/dsa-3989 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- http://www.securityfocus.com/bid/101085 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1039474 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- http://www.ubuntu.com/usn/USN-3430-1 vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- http://www.ubuntu.com/usn/USN-3430-2 vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://access.redhat.com/errata/RHSA-2017:2836 vendor-advisoryx_refsource_REDHATPatchThird Party Advisory
- https://access.redhat.com/errata/RHSA-2017:2837 vendor-advisoryx_refsource_REDHATPatchThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2017-14493 Vendor Advisory
- https://access.redhat.com/security/vulnerabilities/3199382 x_refsource_CONFIRMIssue TrackingThird Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1495411 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2017-14493
- https://security.gentoo.org/glsa/201710-27 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://security.googleblog.com/2017/10/behind-masq-yet-more-dns-and-dhcp.html x_refsource_MISCThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2017-14493
- https://www.exploit-db.com/exploits/42943/ exploitx_refsource_EXPLOIT-DBThird Party AdvisoryVDB Entry
- https://www.kb.cert.org/vuls/id/973527 third-party-advisoryx_refsource_CERT-VNThird Party AdvisoryUS Government Resource
- https://www.mail-archive.com/dnsmasq-discuss%40lists.thekelleys.org.uk/msg11664.html mailing-listx_refsource_MLIST
- https://www.mail-archive.com/dnsmasq-discuss%40lists.thekelleys.org.uk/msg11665.html mailing-listx_refsource_MLIST
- https://www.synology.com/support/security/Synology_SA_17_59_Dnsmasq x_refsource_CONFIRMThird Party Advisory
Change history (0)
No recorded changes yet.