Unrated severityNVD Advisory· Published Apr 8, 2021· Updated Dec 3, 2025
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
36- dnsmasq/dnsmasqdescription
- Range: <2.85
- 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- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CVTJUOFFFHINLKWAOC2ZSC5MOPD4SJ24/mitrevendor-advisoryx_refsource_FEDORA
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FHG7GWSQWKF7JXIMLOGJBKZWBB4VIAJ7/mitrevendor-advisoryx_refsource_FEDORA
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GHURNEHHUBSW45KMIZ4FNBCSUPWPGV5V/mitrevendor-advisoryx_refsource_FEDORA
- security.gentoo.org/glsa/202105-20mitrevendor-advisoryx_refsource_GENTOO
- bugzilla.redhat.com/show_bug.cgimitrex_refsource_MISC
- www.oracle.com/security-alerts/cpujan2022.htmlmitrex_refsource_MISC
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