Description
Heap-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 DNS response.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | dnsmasq | 2.78-1 | — |
| Debian 13 | dnsmasq | 2.78-1 | — |
| Debian 12 | dnsmasq | 2.78-1 | — |
| Debian 9 | dnsmasq | 2.76-5+deb9u1 | DSA-3989-1 |
| Debian 8 | dnsmasq | 2.72-3+deb8u2 | DSA-3989-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 7 | dnsmasq | 2.62-3+deb7u4 | DLA-1124-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | dnsmasq | 2.75-1ubuntu0.16.04.3 | USN-3430-1 |
| Ubuntu 14.04 LTS | dnsmasq | 2.68-1ubuntu0.2 | USN-3430-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | dnsmasq +1 | 2.76-2.el7_4.2 | RHSA-2017:2836 |
| RHEL 6 | dnsmasq +1 | 2.48-18.el6_9 | RHSA-2017:2838 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Rhel Mission Critical 6 | dnsmasq | 2.48-5.el6_2.2 | RHSA-2017:2839 |
| RHEL 7.3 EUS | dnsmasq +1 | 2.66-21.el7_3.2 | RHSA-2017:2837 |
| RHEL 7.2 EUS | dnsmasq +1 | 2.66-14.el7_2.2 | RHSA-2017:2837 |
| RHEL 6.7 EUS | dnsmasq +1 | 2.48-16.el6_7.1 | RHSA-2017:2839 |
| RHEL 6.6 TUS | dnsmasq +1 | 2.48-14.el6_6.1 | RHSA-2017:2839 |
| RHEL 6.6 AUS | dnsmasq +1 | 2.48-14.el6_6.1 | RHSA-2017:2839 |
| RHEL 6.5 TUS | dnsmasq +1 | 2.48-13.el6_5.1 | RHSA-2017:2839 |
| RHEL 6.5 AUS | dnsmasq +1 | 2.48-13.el6_5.1 | RHSA-2017:2839 |
| RHEL 6.4 AUS | dnsmasq +1 | 2.48-13.el6_4.1 | RHSA-2017:2839 |
| RHEL 5.9 AUS | dnsmasq | 2.45-2.el5_9.1 | RHSA-2017:2841 |
| RHEL 5 ELS | dnsmasq | 2.45-2.el5_11.1 | RHSA-2017:2840 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | dnsmasq | 2.78-18.3.1 | SUSE-SU-2017:2618-1 |
| SLES 12 SP2 | dnsmasq | 2.78-18.3.1 | SUSE-SU-2017:2618-1 |
| SLES 12 SP1 | dnsmasq | 2.78-18.3.1 | SUSE-SU-2017:2618-1 |
| SLES 12 | dnsmasq | 2.78-6.6.1 | SUSE-SU-2017:2616-1 |
| SLES 11 SP4 | dnsmasq | 2.78-0.17.5.1 | SUSE-SU-2017:2619-1 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 11 SP3 | dnsmasq | 2.78-0.16.5.1 | SUSE-SU-2017:2617-1 |
| SLES for SAP 12 SP3 | dnsmasq | 2.78-18.3.1 | SUSE-SU-2017:2618-1 |
| SLES for SAP 12 SP2 | dnsmasq | 2.78-18.3.1 | SUSE-SU-2017:2618-1 |
| SLES for SAP 12 SP1 | dnsmasq | 2.78-18.3.1 | SUSE-SU-2017:2618-1 |
| SLES for SAP 11 SP4 | dnsmasq | 2.78-0.17.5.1 | SUSE-SU-2017:2619-1 |
| SUSE OpenStack Cloud 7 | dnsmasq | 2.78-18.3.1 | SUSE-SU-2017:2618-1 |
| SUSE OpenStack Cloud 6 | dnsmasq | 2.78-18.3.1 | SUSE-SU-2017:2618-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | dnsmasq | 2.78-0.16.5.1 | SUSE-SU-2017:2617-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | dnsmasq | 2.86-1.1 | openSUSE-SU-2024:10721-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | dnsmasq | 2.78-r0 | — |
| Alpine v3.23 | dnsmasq | 2.78-r0 | — |
| Alpine v3.22 | dnsmasq | 2.78-r0 | — |
| Alpine v3.21 | dnsmasq | 2.78-r0 | — |
| Alpine v3.20 | dnsmasq | 2.78-r0 | — |
Show 17 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | dnsmasq | 2.78-r0 | — |
| Alpine v3.18 | dnsmasq | 2.78-r0 | — |
| Alpine v3.17 | dnsmasq | 2.78-r0 | — |
| Alpine v3.16 | dnsmasq | 2.78-r0 | — |
| Alpine v3.15 | dnsmasq | 2.78-r0 | — |
| Alpine v3.14 | dnsmasq | 2.78-r0 | — |
| Alpine v3.13 | dnsmasq | 2.78-r0 | — |
| Alpine v3.12 | dnsmasq | 2.78-r0 | — |
| Alpine v3.11 | dnsmasq | 2.78-r0 | — |
| Alpine v3.10 | dnsmasq | 2.78-r0 | — |
| Alpine v3.9 | dnsmasq | 2.78-r0 | — |
| Alpine v3.8 | dnsmasq | 2.78-r0 | — |
| Alpine v3.7 | dnsmasq | 2.78-r0 | — |
| Alpine v3.6 | dnsmasq | 2.76-r5 | — |
| Alpine v3.5 | dnsmasq | 2.76-r2 | — |
| Alpine v3.4 | dnsmasq | 2.76-r1 | — |
| Alpine v3.3 | dnsmasq | 2.76-r1 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | dnsmasq +1 | 2.76-5.amzn2 | ALAS2-2019-1251 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | dnsmasq +1 | 2.76-2.el7_4.2 | ELSA-2017-2836 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 1
- Dnsmasq < 2.78 - 2-byte Heap Overflow EDB-42941 · dos · Oct 2, 2017 · verified
GitHub 1 repository
-
skyformat99/dnsmasq-2.4.1-fix-CVE-2017-14491 ★ 0 · Oct 30, 2017
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 19
- RHSA-2017:2837 Red Hat Security Advisory: dnsmasq security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2017:2839 Red Hat Security Advisory: dnsmasq security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2017:2838 Red Hat Security Advisory: dnsmasq security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2017:2836 Red Hat Security Advisory: dnsmasq security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-3989-1 dnsmasq - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1124-1 dnsmasq - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-3430-1 dnsmasq vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2017:2617-1 Security update for dnsmasq SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2618-1 Security update for dnsmasq SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2619-1 Security update for dnsmasq SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10721-1 dnsmasq-2.86-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- RHSA-2017:2841 Red Hat Security Advisory: dnsmasq security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2017:2840 Red Hat Security Advisory: dnsmasq security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- SUSE-SU-2017:2616-1 Security update for dnsmasq SUSE / openSUSE Security Updates · May 2, 2025
- ICSA-24-074-07 Siemens SIMATIC CISA ICS & IT advisories · Mar 14, 2024
- SSA-770721 SSA-770721: Multiple Vulnerabilities in SIMATIC RF160B before V2.2 Siemens ProductCERT · Mar 12, 2024
- ALAS2-2019-1251 Critical: dnsmasq security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jul 22, 2019
- ICSA-17-332-01 Siemens SCALANCE W1750D, M800, S615, and RUGGEDCOM RM1224 (Update C) CISA ICS & IT advisories · May 9, 2018
- ELSA-2017-2836 Critical: dnsmasq security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 2, 2017
References
- 1039474 vdb-entry
- https://www.synology.com/support/security/Synology_SA_17_59_Dnsmasq
- DSA-3989 vendor-advisory
- https://access.redhat.com/security/vulnerabilities/3199382
- 101085 vdb-entry
- USN-3430-1 vendor-advisory
- http://thekelleys.org.uk/gitweb/?p=dnsmasq.git%3Ba=commit%3Bh=0549c73b7ea6b22a3c49beb4d432f185a81efcbc
- 101977 vdb-entry
- RHSA-2017:2838 vendor-advisory
- VU#973527 third-party-advisory
- GLSA-201710-27 vendor-advisory
- RHSA-2017:2840 vendor-advisory
- USN-3430-2 vendor-advisory
- RHSA-2017:2839 vendor-advisory
- [dnsmasq-discuss] 20171002 Announce: dnsmasq-2.78. mailing-list
- RHSA-2017:2836 vendor-advisory
- http://nvidia.custhelp.com/app/answers/detail/a_id/4561
- http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2017-005.txt
- RHSA-2017:2837 vendor-advisory
- 42941 exploit
- http://thekelleys.org.uk/dnsmasq/CHANGELOG
- RHSA-2017:2841 vendor-advisory
- http://nvidia.custhelp.com/app/answers/detail/a_id/4560
- openSUSE-SU-2017:2633 vendor-advisory
- https://security.googleblog.com/2017/10/behind-masq-yet-more-dns-and-dhcp.html
- [dnsmasq-discuss] 20171002 IMPORTANT SECURITY INFORMATION. mailing-list
- https://cert-portal.siemens.com/productcert/pdf/ssa-689071.pdf
- FEDORA-2017-515264ae24 vendor-advisory
- FEDORA-2017-24f067299e vendor-advisory
- USN-3430-3 vendor-advisory
- http://packetstormsecurity.com/files/144480/Dnsmasq-2-Byte-Heap-Based-Overflow.html
- SUSE-SU-2017:2619 vendor-advisory
- https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2017-449/
- http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20171103-01-dnsmasq-en
- https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2017-449
- FEDORA-2017-7106a157f5 vendor-advisory
- SUSE-SU-2017:2616 vendor-advisory
- SUSE-SU-2017:2617 vendor-advisory
- DSA-3989 vendor-advisory
- https://www.arista.com/en/support/advisories-notices/security-advisories/3577-security-advisory-30