Medium severity6.8NVD Advisory· Published Mar 23, 2022· Updated Jun 17, 2026
CVE-2021-25220
CVE-2021-25220
Description
BIND 9.11.0 -> 9.11.36 9.12.0 -> 9.16.26 9.17.0 -> 9.18.0 BIND Supported Preview Editions: 9.11.4-S1 -> 9.11.36-S1 9.16.8-S1 -> 9.16.26-S1 Versions of BIND 9 earlier than those shown - back to 9.1.0, including Supported Preview Editions - are also believed to be affected but have not been tested as they are EOL. The cache could become poisoned with incorrect records leading to queries being made to the wrong servers, which might also result in false information being returned to clients.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
929.11.0 -> 9.11.36, 9.12.0 -> 9.16.26, 9.17.0 -> 9.18.0, 9.11.4-S1 -> 9.11.36-S1, 9.16.8-S1 -> 9.16.26-S1, and earlier versions back to 9.1.0+ 1 more
- (no CPE)range: 9.11.0 -> 9.11.36, 9.12.0 -> 9.16.26, 9.17.0 -> 9.18.0, 9.11.4-S1 -> 9.11.36-S1, 9.16.8-S1 -> 9.16.26-S1, and earlier versions back to 9.1.0
- (no CPE)range: Open Source Branch 9.11 9.11.0 through versions before 9.11.37
- osv-coords90 versionspkg:apk/chainguard/bindpkg:apk/chainguard/bind-devpkg:apk/chainguard/bind-dnssec-rootpkg:apk/chainguard/bind-dnssec-toolspkg:apk/chainguard/bind-docpkg:apk/chainguard/bind-libspkg:apk/chainguard/bind-pluginspkg:apk/chainguard/bind-toolspkg:apk/wolfi/bindpkg:apk/wolfi/bind-devpkg:apk/wolfi/bind-dnssec-rootpkg:apk/wolfi/bind-dnssec-toolspkg:apk/wolfi/bind-docpkg:apk/wolfi/bind-libspkg:apk/wolfi/bind-pluginspkg:apk/wolfi/bind-toolspkg:rpm/almalinux/bindpkg:rpm/almalinux/bind9.16pkg:rpm/almalinux/bind9.16-chrootpkg:rpm/almalinux/bind9.16-develpkg:rpm/almalinux/bind9.16-dnssec-utilspkg:rpm/almalinux/bind9.16-docpkg:rpm/almalinux/bind9.16-libspkg:rpm/almalinux/bind9.16-licensepkg:rpm/almalinux/bind9.16-utilspkg:rpm/almalinux/bind-chrootpkg:rpm/almalinux/bind-develpkg:rpm/almalinux/bind-dnssec-docpkg:rpm/almalinux/bind-dnssec-utilspkg:rpm/almalinux/bind-docpkg:rpm/almalinux/bind-export-develpkg:rpm/almalinux/bind-export-libspkg:rpm/almalinux/bind-libspkg:rpm/almalinux/bind-libs-litepkg:rpm/almalinux/bind-licensepkg:rpm/almalinux/bind-lite-develpkg:rpm/almalinux/bind-pkcs11pkg:rpm/almalinux/bind-pkcs11-develpkg:rpm/almalinux/bind-pkcs11-libspkg:rpm/almalinux/bind-pkcs11-utilspkg:rpm/almalinux/bind-sdbpkg:rpm/almalinux/bind-sdb-chrootpkg:rpm/almalinux/bind-utilspkg:rpm/almalinux/dhcp-clientpkg:rpm/almalinux/dhcp-commonpkg:rpm/almalinux/dhcp-relaypkg:rpm/almalinux/dhcp-serverpkg:rpm/almalinux/python3-bindpkg:rpm/almalinux/python3-bind9.16pkg:rpm/opensuse/bind&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/bind&distro=openSUSE%20Leap%2015.4pkg:rpm/opensuse/bind&distro=openSUSE%20Tumbleweedpkg:rpm/suse/bind&distro=HPE%20Helion%20OpenStack%208pkg:rpm/suse/bind&distro=SUSE%20Enterprise%20Storage%206pkg:rpm/suse/bind&distro=SUSE%20Enterprise%20Storage%207pkg:rpm/suse/bind&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-ESPOSpkg:rpm/suse/bind&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-LTSSpkg:rpm/suse/bind&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP2-ESPOSpkg:rpm/suse/bind&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP2-LTSSpkg:rpm/suse/bind&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-ESPOSpkg:rpm/suse/bind&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-LTSSpkg:rpm/suse/bind&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3pkg:rpm/suse/bind&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP4pkg:rpm/suse/bind&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP3pkg:rpm/suse/bind&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP4pkg:rpm/suse/bind&distro=SUSE%20Linux%20Enterprise%20Real%20Time%2015%20SP2pkg:rpm/suse/bind&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-BCLpkg:rpm/suse/bind&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-BCLpkg:rpm/suse/bind&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-LTSSpkg:rpm/suse/bind&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP4-LTSSpkg:rpm/suse/bind&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5pkg:rpm/suse/bind&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-BCLpkg:rpm/suse/bind&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-LTSSpkg:rpm/suse/bind&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP2-BCLpkg:rpm/suse/bind&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP2-LTSSpkg:rpm/suse/bind&distro=SUSE%20Linux%20Enterprise%20Server%2015-LTSSpkg:rpm/suse/bind&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP3pkg:rpm/suse/bind&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP4pkg:rpm/suse/bind&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5pkg:rpm/suse/bind&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015pkg:rpm/suse/bind&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP1pkg:rpm/suse/bind&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP2pkg:rpm/suse/bind&distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2012%20SP5pkg:rpm/suse/bind&distro=SUSE%20Manager%20Proxy%204.1pkg:rpm/suse/bind&distro=SUSE%20Manager%20Retail%20Branch%20Server%204.1pkg:rpm/suse/bind&distro=SUSE%20Manager%20Server%204.1pkg:rpm/suse/bind&distro=SUSE%20OpenStack%20Cloud%208pkg:rpm/suse/bind&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/bind&distro=SUSE%20OpenStack%20Cloud%20Crowbar%208pkg:rpm/suse/bind&distro=SUSE%20OpenStack%20Cloud%20Crowbar%209
< 0+ 89 more
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 32:9.11.36-5.el8
- (no CPE)range: < 32:9.16.23-0.9.el8.1
- (no CPE)range: < 32:9.16.23-0.9.el8.1
- (no CPE)range: < 32:9.16.23-0.9.el8.1
- (no CPE)range: < 32:9.16.23-0.9.el8.1
- (no CPE)range: < 32:9.16.23-0.9.el8.1
- (no CPE)range: < 32:9.16.23-0.9.el8.1
- (no CPE)range: < 32:9.16.23-0.9.el8.1
- (no CPE)range: < 32:9.16.23-0.9.el8.1
- (no CPE)range: < 32:9.11.36-5.el8
- (no CPE)range: < 32:9.11.36-5.el8
- (no CPE)range: < 32:9.16.23-5.el9_1
- (no CPE)range: < 32:9.16.23-5.el9_1
- (no CPE)range: < 32:9.16.23-5.el9_1
- (no CPE)range: < 32:9.11.36-5.el8
- (no CPE)range: < 32:9.11.36-5.el8
- (no CPE)range: < 32:9.11.36-5.el8
- (no CPE)range: < 32:9.11.36-5.el8
- (no CPE)range: < 32:9.11.36-5.el8
- (no CPE)range: < 32:9.11.36-5.el8
- (no CPE)range: < 32:9.11.36-5.el8
- (no CPE)range: < 32:9.11.36-5.el8
- (no CPE)range: < 32:9.11.36-5.el8
- (no CPE)range: < 32:9.11.36-5.el8
- (no CPE)range: < 32:9.11.36-5.el8
- (no CPE)range: < 32:9.11.36-5.el8
- (no CPE)range: < 32:9.11.36-5.el8
- (no CPE)range: < 12:4.4.2-17.b1.el9
- (no CPE)range: < 12:4.4.2-17.b1.el9
- (no CPE)range: < 12:4.4.2-17.b1.el9
- (no CPE)range: < 12:4.4.2-17.b1.el9
- (no CPE)range: < 32:9.11.36-5.el8
- (no CPE)range: < 32:9.16.23-0.9.el8.1
- (no CPE)range: < 9.16.6-150300.22.16.1
- (no CPE)range: < 9.16.31-150400.5.6.1
- (no CPE)range: < 9.18.2-1.1
- (no CPE)range: < 9.9.9P1-63.34.1
- (no CPE)range: < 9.16.6-150000.12.60.1
- (no CPE)range: < 9.16.6-150000.12.60.1
- (no CPE)range: < 9.16.6-150000.12.60.1
- (no CPE)range: < 9.16.6-150000.12.60.1
- (no CPE)range: < 9.16.6-150000.12.60.1
- (no CPE)range: < 9.16.6-150000.12.60.1
- (no CPE)range: < 9.16.6-150000.12.60.1
- (no CPE)range: < 9.16.6-150000.12.60.1
- (no CPE)range: < 9.16.6-150300.22.16.1
- (no CPE)range: < 9.16.31-150400.5.6.1
- (no CPE)range: < 9.16.6-150300.22.16.1
- (no CPE)range: < 9.16.31-150400.5.6.1
- (no CPE)range: < 9.16.6-150000.12.60.1
- (no CPE)range: < 9.9.9P1-63.34.1
- (no CPE)range: < 9.9.9P1-63.34.1
- (no CPE)range: < 9.9.9P1-63.34.1
- (no CPE)range: < 9.11.22-3.40.1
- (no CPE)range: < 9.11.22-3.40.1
- (no CPE)range: < 9.16.6-150000.12.60.1
- (no CPE)range: < 9.16.6-150000.12.60.1
- (no CPE)range: < 9.16.6-150000.12.60.1
- (no CPE)range: < 9.16.6-150000.12.60.1
- (no CPE)range: < 9.16.6-150000.12.60.1
- (no CPE)range: < 9.9.9P1-63.34.1
- (no CPE)range: < 9.11.22-3.40.1
- (no CPE)range: < 9.11.22-3.40.1
- (no CPE)range: < 9.16.6-150000.12.60.1
- (no CPE)range: < 9.16.6-150000.12.60.1
- (no CPE)range: < 9.16.6-150000.12.60.1
- (no CPE)range: < 9.11.22-3.40.1
- (no CPE)range: < 9.16.6-150000.12.60.1
- (no CPE)range: < 9.16.6-150000.12.60.1
- (no CPE)range: < 9.16.6-150000.12.60.1
- (no CPE)range: < 9.9.9P1-63.34.1
- (no CPE)range: < 9.11.22-3.40.1
- (no CPE)range: < 9.9.9P1-63.34.1
- (no CPE)range: < 9.11.22-3.40.1
Patches
Vulnerability mechanics
References
10- cert-portal.siemens.com/productcert/pdf/ssa-637483.pdfnvdPatchThird Party Advisory
- kb.isc.org/v1/docs/cve-2021-25220nvdMitigationVendor Advisory
- security.gentoo.org/glsa/202210-25nvdThird Party Advisory
- security.netapp.com/advisory/ntap-20220408-0001/nvdThird Party Advisory
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2SXT7247QTKNBQ67MNRGZD23ADXU6E5U/nvd
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5VX3I2U3ICOIEI5Y7OYA6CHOLFMNH3YQ/nvd
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/API7U5E7SX7BAAVFNW366FFJGD6NZZKV/nvd
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DE3UAVCPUMAKG27ZL5YXSP2C3RIOW3JZ/nvd
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NYD7US4HZRFUGAJ66ZTHFBYVP5N3OQBY/nvd
- supportportal.juniper.net/s/article/2022-10-Security-Bulletin-Junos-OS-SRX-Series-Cache-poisoning-vulnerability-in-BIND-used-by-DNS-Proxy-CVE-2021-25220nvd
News mentions
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