Medium severity4.0NVD Advisory· Published Apr 8, 2021· Updated Jun 17, 2026
CVE-2021-3448
CVE-2021-3448
Description
A flaw was found in dnsmasq in versions before 2.85. When configured to use a specific server for a given network interface, dnsmasq uses a fixed port while forwarding queries. An attacker on the network, able to find the outgoing port used by dnsmasq, only needs to guess the random transmission ID to forge a reply and get it accepted by dnsmasq. This flaw makes a DNS Cache Poisoning attack much easier. The highest threat from this vulnerability is to data integrity.
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Affected products
42- cpe:2.3:a:oracle:communications_cloud_native_core_network_function_cloud_native_environment:1.9.0:*:*:*:*:*:*:*
cpe:2.3:a:thekelleys:dnsmasq:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:thekelleys:dnsmasq:*:*:*:*:*:*:*:*range: <2.85
- (no CPE)range: <2.85
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
- dnsmasq/dnsmasqdescription
- osv-coords34 versionspkg:rpm/almalinux/dnsmasqpkg:rpm/almalinux/dnsmasq-utilspkg:rpm/opensuse/dnsmasq&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/dnsmasq&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/dnsmasq&distro=openSUSE%20Tumbleweedpkg:rpm/suse/dnsmasq&distro=HPE%20Helion%20OpenStack%208pkg:rpm/suse/dnsmasq&distro=SUSE%20Enterprise%20Storage%206pkg:rpm/suse/dnsmasq&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-ESPOSpkg:rpm/suse/dnsmasq&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-LTSSpkg:rpm/suse/dnsmasq&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-ESPOSpkg:rpm/suse/dnsmasq&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-LTSSpkg:rpm/suse/dnsmasq&distro=SUSE%20Linux%20Enterprise%20Micro%205.0pkg:rpm/suse/dnsmasq&distro=SUSE%20Linux%20Enterprise%20Micro%205.1pkg:rpm/suse/dnsmasq&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP2pkg:rpm/suse/dnsmasq&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3pkg:rpm/suse/dnsmasq&distro=SUSE%20Linux%20Enterprise%20Point%20of%20Sale%2011%20SP3pkg:rpm/suse/dnsmasq&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSSpkg:rpm/suse/dnsmasq&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-BCLpkg:rpm/suse/dnsmasq&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-BCLpkg:rpm/suse/dnsmasq&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-LTSSpkg:rpm/suse/dnsmasq&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP4-LTSSpkg:rpm/suse/dnsmasq&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5pkg:rpm/suse/dnsmasq&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-BCLpkg:rpm/suse/dnsmasq&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-LTSSpkg:rpm/suse/dnsmasq&distro=SUSE%20Linux%20Enterprise%20Server%2015-LTSSpkg:rpm/suse/dnsmasq&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP3pkg:rpm/suse/dnsmasq&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP4pkg:rpm/suse/dnsmasq&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5pkg:rpm/suse/dnsmasq&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015pkg:rpm/suse/dnsmasq&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP1pkg:rpm/suse/dnsmasq&distro=SUSE%20OpenStack%20Cloud%208pkg:rpm/suse/dnsmasq&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/dnsmasq&distro=SUSE%20OpenStack%20Cloud%20Crowbar%208pkg:rpm/suse/dnsmasq&distro=SUSE%20OpenStack%20Cloud%20Crowbar%209
< 2.79-19.el8+ 33 more
- (no CPE)range: < 2.79-19.el8
- (no CPE)range: < 2.79-19.el8
- (no CPE)range: < 2.86-lp152.7.6.1
- (no CPE)range: < 2.86-7.14.1
- (no CPE)range: < 2.86-1.1
- (no CPE)range: < 2.78-18.18.1
- (no CPE)range: < 2.86-7.14.1
- (no CPE)range: < 2.86-7.14.1
- (no CPE)range: < 2.86-7.14.1
- (no CPE)range: < 2.78-150000.3.14.1
- (no CPE)range: < 2.78-150000.3.14.1
- (no CPE)range: < 2.86-7.14.1
- (no CPE)range: < 2.86-7.14.1
- (no CPE)range: < 2.86-7.14.1
- (no CPE)range: < 2.86-7.14.1
- (no CPE)range: < 2.78-0.16.17.1
- (no CPE)range: < 2.78-0.17.18.1
- (no CPE)range: < 2.78-18.18.1
- (no CPE)range: < 2.78-18.18.1
- (no CPE)range: < 2.78-18.18.1
- (no CPE)range: < 2.78-18.18.1
- (no CPE)range: < 2.78-18.18.1
- (no CPE)range: < 2.86-7.14.1
- (no CPE)range: < 2.86-7.14.1
- (no CPE)range: < 2.78-150000.3.14.1
- (no CPE)range: < 2.78-18.18.1
- (no CPE)range: < 2.78-18.18.1
- (no CPE)range: < 2.78-18.18.1
- (no CPE)range: < 2.78-150000.3.14.1
- (no CPE)range: < 2.86-7.14.1
- (no CPE)range: < 2.78-18.18.1
- (no CPE)range: < 2.78-18.18.1
- (no CPE)range: < 2.78-18.18.1
- (no CPE)range: < 2.78-18.18.1
Patches
Vulnerability mechanics
References
6- www.oracle.com/security-alerts/cpujan2022.htmlnvdPatchThird Party Advisory
- bugzilla.redhat.com/show_bug.cginvdExploitIssue TrackingPatchThird Party Advisory
- security.gentoo.org/glsa/202105-20nvdThird Party Advisory
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CVTJUOFFFHINLKWAOC2ZSC5MOPD4SJ24/nvd
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FHG7GWSQWKF7JXIMLOGJBKZWBB4VIAJ7/nvd
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GHURNEHHUBSW45KMIZ4FNBCSUPWPGV5V/nvd
News mentions
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