High severity8.1NVD Advisory· Published Jan 20, 2021· Updated Jun 17, 2026
CVE-2020-25681
CVE-2020-25681
Description
A flaw was found in dnsmasq before version 2.83. A heap-based buffer overflow was discovered in the way RRSets are sorted before validating with DNSSEC data. An attacker on the network, who can forge DNS replies such as that they are accepted as valid, could use this flaw to cause a buffer overflow with arbitrary data in a heap memory segment, possibly executing code on the machine. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
35cpe:2.3:a:thekelleys:dnsmasq:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:thekelleys:dnsmasq:*:*:*:*:*:*:*:*range: <2.83
- (no CPE)range: <2.83
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
- dnsmasq/dnsmasqdescription
- osv-coords28 versionspkg:rpm/opensuse/dnsmasq&distro=openSUSE%20Leap%2015.1pkg:rpm/opensuse/dnsmasq&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/dnsmasq&distro=openSUSE%20Tumbleweedpkg:rpm/suse/dnsmasq&distro=HPE%20Helion%20OpenStack%208pkg:rpm/suse/dnsmasq&distro=SUSE%20Enterprise%20Storage%205pkg: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%20Module%20for%20Basesystem%2015%20SP1pkg:rpm/suse/dnsmasq&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP2pkg: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%20SP2-LTSSpkg: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-LTSSpkg:rpm/suse/dnsmasq&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP2pkg: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%20OpenStack%20Cloud%207pkg: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
< 2.78-lp151.5.6.1+ 27 more
- (no CPE)range: < 2.78-lp151.5.6.1
- (no CPE)range: < 2.78-lp152.7.3.1
- (no CPE)range: < 2.86-1.1
- (no CPE)range: < 2.78-18.15.1
- (no CPE)range: < 2.78-18.15.1
- (no CPE)range: < 2.78-3.11.1
- (no CPE)range: < 2.78-3.11.1
- (no CPE)range: < 2.78-7.6.1
- (no CPE)range: < 2.78-7.6.1
- (no CPE)range: < 2.78-0.16.14.1
- (no CPE)range: < 2.78-0.17.15.1
- (no CPE)range: < 2.78-18.15.1
- (no CPE)range: < 2.78-18.15.1
- (no CPE)range: < 2.78-18.15.1
- (no CPE)range: < 2.78-18.15.1
- (no CPE)range: < 2.78-18.15.1
- (no CPE)range: < 2.78-18.15.1
- (no CPE)range: < 2.78-3.11.1
- (no CPE)range: < 2.78-18.15.1
- (no CPE)range: < 2.78-18.15.1
- (no CPE)range: < 2.78-18.15.1
- (no CPE)range: < 2.78-18.15.1
- (no CPE)range: < 2.78-3.11.1
- (no CPE)range: < 2.78-18.15.1
- (no CPE)range: < 2.78-18.15.1
- (no CPE)range: < 2.78-18.15.1
- (no CPE)range: < 2.78-18.15.1
- (no CPE)range: < 2.78-18.15.1
Patches
Vulnerability mechanics
References
8- bugzilla.redhat.com/show_bug.cginvdIssue TrackingPatchThird Party Advisory
- lists.debian.org/debian-lts-announce/2021/03/msg00027.htmlnvdMailing ListThird Party Advisory
- security.gentoo.org/glsa/202101-17nvdThird Party Advisory
- www.debian.org/security/2021/dsa-4844nvdThird Party Advisory
- www.jsof-tech.com/disclosures/dnspooq/nvdThird Party Advisory
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/nvd
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/nvd
- www.kb.cert.org/vuls/id/434904nvd
News mentions
0No linked articles in our index yet.