CVE-2021-25220

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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."}], "affected": [{"vendor": "ISC", "product": "BIND", "versions": [{"version": "Open Source Branch 9.11 9.11.0 through versions before 9.11.37", "status": "affected"}, {"version": "Development Branch 9.17 BIND 9.17 all version", "status": "affected"}, {"version": "Open Source Branch 9.12-16 9.12.0 through versions before 9.16.27", "status": "affected"}, {"version": "Open Source Branch 9.18 9.18.0", "status": "affected"}, {"version": "Supported Preview Branch 9.11-S 9.11.0-S through versions before 9.11.37-S", "status": "affected"}, {"version": "Supported Preview Branch 9.16-S 9.16.0-S through versions before 9.16.27-S", "status": "affected"}]}], "references": [{"url": "https://kb.isc.org/v1/docs/cve-2021-25220"}, {"name": "FEDORA-2022-14e36aac0c", "tags": ["vendor-advisory"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NYD7US4HZRFUGAJ66ZTHFBYVP5N3OQBY/"}, {"name": "FEDORA-2022-042d9c6146", "tags": ["vendor-advisory"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/API7U5E7SX7BAAVFNW366FFJGD6NZZKV/"}, {"url": "https://security.netapp.com/advisory/ntap-20220408-0001/"}, {"name": "FEDORA-2022-a88218de5c", "tags": ["vendor-advisory"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5VX3I2U3ICOIEI5Y7OYA6CHOLFMNH3YQ/"}, {"name": "FEDORA-2022-05918f0838", "tags": ["vendor-advisory"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2SXT7247QTKNBQ67MNRGZD23ADXU6E5U/"}, {"name": "FEDORA-2022-3f293290c3", "tags": ["vendor-advisory"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DE3UAVCPUMAKG27ZL5YXSP2C3RIOW3JZ/"}, {"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf"}, {"name": "GLSA-202210-25", "tags": ["vendor-advisory"], "url": "https://security.gentoo.org/glsa/202210-25"}, {"url": "https://supportportal.juniper.net/s/article/2022-10-Security-Bulletin-Junos-OS-SRX-Series-Cache-poisoning-vulnerability-in-BIND-used-by-DNS-Proxy-CVE-2021-25220?language=en_US"}], "credits": [{"lang": "en", "value": "ISC would like to thank Xiang Li, Baojun Liu, and Chaoyi Lu from Network and Information Security Lab, Tsinghua University and Changgen Zou from Qi An Xin Group Corp. for discovering and reporting this issue."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:N", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "availabilityImpact": "NONE", "baseScore": 6.8, "baseSeverity": "MEDIUM"}}], "problemTypes": [{"descriptions": [{"type": "text", "lang": "en", "description": "When using forwarders, bogus NS records supplied by, or via, those forwarders may be cached and used by named if it needs to recurse for any reason, causing it to obtain and pass on potentially incorrect answers. Some examples of configurations that will be vulnerable are: Resolvers using per zone or global forwarding with forward first (forward first is the default). Resolvers not using global forwarding, but with per-zone forwarding with either forward first (the default) or forward only. Resolvers configured with global forwarding along with zone statements that disable forwarding for part of the DNS namespace. Authoritative-only BIND 9 servers are not vulnerable to this flaw. 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."}]}], "x_generator": {"engine": "Vulnogram 0.0.9"}, "source": {"discovery": "EXTERNAL"}, "workarounds": [{"lang": "en", "value": "If applicable, modify your configuration to either remove all forwarding or all possibility of recursion. Depending on your use-case, it may be possible to use other zone types to replace forward zones.\nActive exploits: We are not aware of any active exploits."}], "solutions": [{"lang": "en", "value": "Upgrade to the patched release most closely related to your current version of BIND:\n BIND 9.11.37\n BIND 9.16.27\n BIND 9.18.1\nBIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers.\n BIND 9.11.37-S1\n BIND 9.16.27-S1"}]}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T19:56:11.083Z"}, "title": "CVE Program Container", "references": [{"url": "https://kb.isc.org/v1/docs/cve-2021-25220", "tags": ["x_transferred"]}, {"name": "FEDORA-2022-14e36aac0c", "tags": ["vendor-advisory", "x_transferred"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NYD7US4HZRFUGAJ66ZTHFBYVP5N3OQBY/"}, {"name": "FEDORA-2022-042d9c6146", "tags": ["vendor-advisory", "x_transferred"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/API7U5E7SX7BAAVFNW366FFJGD6NZZKV/"}, {"url": "https://security.netapp.com/advisory/ntap-20220408-0001/", "tags": ["x_transferred"]}, {"name": "FEDORA-2022-a88218de5c", "tags": ["vendor-advisory", "x_transferred"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5VX3I2U3ICOIEI5Y7OYA6CHOLFMNH3YQ/"}, {"name": "FEDORA-2022-05918f0838", "tags": ["vendor-advisory", "x_transferred"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2SXT7247QTKNBQ67MNRGZD23ADXU6E5U/"}, {"name": "FEDORA-2022-3f293290c3", "tags": ["vendor-advisory", "x_transferred"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DE3UAVCPUMAKG27ZL5YXSP2C3RIOW3JZ/"}, {"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf", "tags": ["x_transferred"]}, {"name": "GLSA-202210-25", "tags": ["vendor-advisory", "x_transferred"], "url": "https://security.gentoo.org/glsa/202210-25"}, {"url": "https://supportportal.juniper.net/s/article/2022-10-Security-Bulletin-Junos-OS-SRX-Series-Cache-poisoning-vulnerability-in-BIND-used-by-DNS-Proxy-CVE-2021-25220?language=en_US", "tags": ["x_transferred"]}]}]}}

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"cpe:2.3:h:juniper:srx650:-:*:*:*:*:*:*:*", "matchCriteriaId": "8AA424D4-4DBF-4E8C-96B8-E37741B5403E", "vulnerable": false}], "negate": false, "operator": "OR"}], "operator": "AND"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "BIND versiones 9.11.0 posteriores a 9.11.36, versiones 9.12.0 posteriores a 9.16.26, versiones 9.17.0 posteriores a 9.18.0, Ediciones Preliminares Soportadas con BIND: versiones .11.4-S1 posteriores a 9.11.36-S1, versiones 9.16.8-S1 posteriores a 9.16.26-S1, tambi\u00e9n creemos que las versiones de BIND 9 anteriores a las mostradas - hasta la versi\u00f3n 9.1.0, incluyendo las ediciones preliminares soportadas - tambi\u00e9n est\u00e1n afectadas pero no han sido probadas ya que son EOL. La cach\u00e9 podr\u00eda envenenarse con registros incorrectos, conllevando a una realizaci\u00f3n de consultas a servidores err\u00f3neos, lo que tambi\u00e9n podr\u00eda resultar en que se devolviera informaci\u00f3n falsa a clientes"}], "id": "CVE-2021-25220", "lastModified": "2026-06-17T03:41:40.183", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "SINGLE", "availabilityImpact": "NONE", "baseScore": 4.0, "confidentialityImpact": "NONE", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:L/Au:S/C:N/I:P/A:N", "version": "2.0"}, "exploitabilityScore": 8.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.3, "impactScore": 4.0, "source": "security-officer@isc.org", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.3, "impactScore": 4.0, "source": "nvd@nist.gov", "type": "Secondary"}]}, "published": "2022-03-23T13:15:07.680", "references": [{"source": "security-officer@isc.org", "tags": ["Patch", "Third Party Advisory"], "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf"}, {"source": "security-officer@isc.org", "tags": ["Mitigation", "Vendor Advisory"], "url": "https://kb.isc.org/v1/docs/cve-2021-25220"}, {"source": "security-officer@isc.org", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2SXT7247QTKNBQ67MNRGZD23ADXU6E5U/"}, {"source": "security-officer@isc.org", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5VX3I2U3ICOIEI5Y7OYA6CHOLFMNH3YQ/"}, {"source": "security-officer@isc.org", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/API7U5E7SX7BAAVFNW366FFJGD6NZZKV/"}, {"source": "security-officer@isc.org", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DE3UAVCPUMAKG27ZL5YXSP2C3RIOW3JZ/"}, {"source": "security-officer@isc.org", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NYD7US4HZRFUGAJ66ZTHFBYVP5N3OQBY/"}, {"source": "security-officer@isc.org", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/202210-25"}, {"source": "security-officer@isc.org", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20220408-0001/"}, {"source": "security-officer@isc.org", "url": "https://supportportal.juniper.net/s/article/2022-10-Security-Bulletin-Junos-OS-SRX-Series-Cache-poisoning-vulnerability-in-BIND-used-by-DNS-Proxy-CVE-2021-25220?language=en_US"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mitigation", "Vendor Advisory"], "url": "https://kb.isc.org/v1/docs/cve-2021-25220"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2SXT7247QTKNBQ67MNRGZD23ADXU6E5U/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5VX3I2U3ICOIEI5Y7OYA6CHOLFMNH3YQ/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/API7U5E7SX7BAAVFNW366FFJGD6NZZKV/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DE3UAVCPUMAKG27ZL5YXSP2C3RIOW3JZ/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NYD7US4HZRFUGAJ66ZTHFBYVP5N3OQBY/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/202210-25"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20220408-0001/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://supportportal.juniper.net/s/article/2022-10-Security-Bulletin-Junos-OS-SRX-Series-Cache-poisoning-vulnerability-in-BIND-used-by-DNS-Proxy-CVE-2021-25220?language=en_US"}], "sourceIdentifier": "security-officer@isc.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-444"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"acknowledgement": "Upstream acknowledges Baojun Liu (Network and Information Security Lab, Tsinghua University), Changgen Zou (Qi An Xin Group Corp), Chaoyi Lu (Network and Information Security Lab, Tsinghua University), and Xiang Li (Network and Information Security Lab, Tsinghua University) as the original reporters.", "affected_release": [{"advisory": "RHSA-2023:0402", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "bind-32:9.11.4-26.P2.el7_9.13", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2023-01-24T00:00:00Z"}, {"advisory": "RHSA-2022:7643", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "bind9.16-32:9.16.23-0.9.el8.1", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2022-11-08T00:00:00Z"}, {"advisory": "RHSA-2022:7790", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "bind-32:9.11.36-5.el8", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2022-11-08T00:00:00Z"}, {"advisory": "RHSA-2022:7790", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "bind-32:9.11.36-5.el8", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2022-11-08T00:00:00Z"}, {"advisory": "RHSA-2024:2720", "cpe": "cpe:/a:redhat:rhel_eus:8.6", "package": "bind-32:9.11.36-3.el8_6.7", "product_name": "Red Hat Enterprise Linux 8.6 Extended Update Support", "release_date": "2024-05-07T00:00:00Z"}, {"advisory": "RHSA-2024:2720", "cpe": "cpe:/a:redhat:rhel_eus:8.6", "package": "dhcp-12:4.3.6-47.el8_6.2", "product_name": "Red Hat Enterprise Linux 8.6 Extended Update Support", "release_date": "2024-05-07T00:00:00Z"}, {"advisory": "RHSA-2022:8068", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "bind-32:9.16.23-5.el9_1", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2022-11-15T00:00:00Z"}, {"advisory": "RHSA-2022:8385", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "dhcp-12:4.4.2-17.b1.el9", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2022-11-15T00:00:00Z"}], "bugzilla": {"description": "bind: DNS forwarders - cache poisoning vulnerability", "id": "2064512", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2064512"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:N", "status": "verified"}, "cwe": "CWE-444", "details": ["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.", "A cache poisoning vulnerability was found in BIND when using forwarders. Bogus NS records supplied by the forwarders may be cached and used by name if it needs to recurse for any reason. This issue causes it to obtain and pass on potentially incorrect answers. This flaw allows a remote high privileged attacker to manipulate cache results with incorrect records, leading to queries made to the wrong servers, possibly resulting in false information received on the client's end."], "mitigation": {"lang": "en:us", "value": "If applicable, modify your configuration to either remove all forwarding or all possibility of recursion. Depending on your use case, it may be possible to use other zone types to replace forward zones."}, "name": "CVE-2021-25220", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "bind", "product_name": "Red Hat Enterprise Linux 6"}], "public_date": "2022-03-16T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-25220\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-25220\nhttps://kb.isc.org/docs/CVE-2021-25220"], "statement": "Versions of BIND shipped with Red Hat Enterprise Linux 8, 9 are affected, because vulnerable code is present in our code base.\nFor RHEL-9, DHCP uses the vulnerable BIND 9 libraries (bind-9.11.14) for some services. Hence, it is affected as well.\nAuthoritative - Only BIND 9 servers are not vulnerable to this flaw.", "threat_severity": "Moderate"}

{}