{ "document": { "aggregate_severity": { "text": "Medium" }, "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_alt_common/el10/vex/2021/cve-2021-23841-els_alt_common-el10.json" } ], "tracking": { "current_release_date": "2026-06-12T16:51:15Z", "generator": { "date": "2026-06-12T16:51:15Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2021-23841-ELS_ALT_COMMON-EL10", "initial_release_date": "2021-02-16T17:15:00Z", "revision_history": [ { "date": "2021-02-16T17:15:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-06-12T16:51:15Z", "number": "2", "summary": "Official Publication" } ], "status": "final", "version": "2" }, "title": "Security update on CVE-2021-23841" }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Community Enterprise Operating System 10", "product": { "name": "Community Enterprise Operating System 10", "product_id": "CentOS-10", "product_identification_helper": { "cpe": "cpe:2.3:o:centos:centos:10:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "Community Enterprise Operating System" } ], "category": "vendor", "name": "Cloud Linux Software, Inc." }, { "branches": [ { "branches": [ { "category": "product_version", "name": "alt-openssl11-libs-1:1.1.1w-3.3.el10.x86_64", "product": { "name": "alt-openssl11-libs-1:1.1.1w-3.3.el10.x86_64", "product_id": "alt-openssl11-libs-1:1.1.1w-3.3.el10.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/alt-openssl11-libs@1.1.1w-3.3.el10?arch=x86_64&epoch=1&os_name=centos&os_version=10" } } }, { "category": "product_version", "name": "alt-openssl11-libs-1:1.1.1w-3.1.el10.x86_64", "product": { "name": "alt-openssl11-libs-1:1.1.1w-3.1.el10.x86_64", "product_id": "alt-openssl11-libs-1:1.1.1w-3.1.el10.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/alt-openssl11-libs@1.1.1w-3.1.el10?arch=x86_64&epoch=1&os_name=centos&os_version=10" } } }, { "category": "product_version", "name": "alt-openssl11-libs-1:1.1.1w-3.2.el10.x86_64", "product": { "name": "alt-openssl11-libs-1:1.1.1w-3.2.el10.x86_64", "product_id": "alt-openssl11-libs-1:1.1.1w-3.2.el10.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/alt-openssl11-libs@1.1.1w-3.2.el10?arch=x86_64&epoch=1&os_name=centos&os_version=10" } } }, { "category": "product_version", "name": "alt-openssl11-devel-1:1.1.1w-3.1.el10.x86_64", "product": { "name": "alt-openssl11-devel-1:1.1.1w-3.1.el10.x86_64", "product_id": "alt-openssl11-devel-1:1.1.1w-3.1.el10.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/alt-openssl11-devel@1.1.1w-3.1.el10?arch=x86_64&epoch=1&os_name=centos&os_version=10" } } }, { "category": "product_version", "name": "alt-openssl11-devel-1:1.1.1w-3.2.el10.x86_64", "product": { "name": "alt-openssl11-devel-1:1.1.1w-3.2.el10.x86_64", "product_id": "alt-openssl11-devel-1:1.1.1w-3.2.el10.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/alt-openssl11-devel@1.1.1w-3.2.el10?arch=x86_64&epoch=1&os_name=centos&os_version=10" } } }, { "category": "product_version", "name": "alt-openssl11-devel-1:1.1.1w-3.3.el10.x86_64", "product": { "name": "alt-openssl11-devel-1:1.1.1w-3.3.el10.x86_64", "product_id": "alt-openssl11-devel-1:1.1.1w-3.3.el10.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/alt-openssl11-devel@1.1.1w-3.3.el10?arch=x86_64&epoch=1&os_name=centos&os_version=10" } } }, { "category": "product_version", "name": "alt-openssl11-1:1.1.1w-3.2.el10.x86_64", "product": { "name": "alt-openssl11-1:1.1.1w-3.2.el10.x86_64", "product_id": "alt-openssl11-1:1.1.1w-3.2.el10.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/alt-openssl11@1.1.1w-3.2.el10?arch=x86_64&epoch=1&os_name=centos&os_version=10" } } }, { "category": "product_version", "name": "alt-openssl11-1:1.1.1w-3.1.el10.x86_64", "product": { "name": "alt-openssl11-1:1.1.1w-3.1.el10.x86_64", "product_id": "alt-openssl11-1:1.1.1w-3.1.el10.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/alt-openssl11@1.1.1w-3.1.el10?arch=x86_64&epoch=1&os_name=centos&os_version=10" } } }, { "category": "product_version", "name": "alt-openssl11-1:1.1.1w-3.3.el10.x86_64", "product": { "name": "alt-openssl11-1:1.1.1w-3.3.el10.x86_64", "product_id": "alt-openssl11-1:1.1.1w-3.3.el10.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/alt-openssl11@1.1.1w-3.3.el10?arch=x86_64&epoch=1&os_name=centos&os_version=10" } } } ], "category": "architecture", "name": "x86_64" } ], "category": "vendor", "name": "TuxCare" } ], "relationships": [ { "category": "default_component_of", "full_product_name": { "name": "alt-openssl11-libs-1:1.1.1w-3.3.el10.x86_64 as a component of Community Enterprise Operating System 10", "product_id": "CentOS-10:alt-openssl11-libs-1:1.1.1w-3.3.el10.x86_64" }, "product_reference": "alt-openssl11-libs-1:1.1.1w-3.3.el10.x86_64", "relates_to_product_reference": "CentOS-10" }, { "category": "default_component_of", "full_product_name": { "name": "alt-openssl11-libs-1:1.1.1w-3.1.el10.x86_64 as a component of Community Enterprise Operating System 10", "product_id": "CentOS-10:alt-openssl11-libs-1:1.1.1w-3.1.el10.x86_64" }, "product_reference": "alt-openssl11-libs-1:1.1.1w-3.1.el10.x86_64", "relates_to_product_reference": "CentOS-10" }, { "category": "default_component_of", "full_product_name": { "name": "alt-openssl11-libs-1:1.1.1w-3.2.el10.x86_64 as a component of Community Enterprise Operating System 10", "product_id": "CentOS-10:alt-openssl11-libs-1:1.1.1w-3.2.el10.x86_64" }, "product_reference": "alt-openssl11-libs-1:1.1.1w-3.2.el10.x86_64", "relates_to_product_reference": "CentOS-10" }, { "category": "default_component_of", "full_product_name": { "name": "alt-openssl11-devel-1:1.1.1w-3.1.el10.x86_64 as a component of Community Enterprise Operating System 10", "product_id": "CentOS-10:alt-openssl11-devel-1:1.1.1w-3.1.el10.x86_64" }, "product_reference": "alt-openssl11-devel-1:1.1.1w-3.1.el10.x86_64", "relates_to_product_reference": "CentOS-10" }, { "category": "default_component_of", "full_product_name": { "name": "alt-openssl11-devel-1:1.1.1w-3.2.el10.x86_64 as a component of Community Enterprise Operating System 10", "product_id": "CentOS-10:alt-openssl11-devel-1:1.1.1w-3.2.el10.x86_64" }, "product_reference": "alt-openssl11-devel-1:1.1.1w-3.2.el10.x86_64", "relates_to_product_reference": "CentOS-10" }, { "category": "default_component_of", "full_product_name": { "name": "alt-openssl11-devel-1:1.1.1w-3.3.el10.x86_64 as a component of Community Enterprise Operating System 10", "product_id": "CentOS-10:alt-openssl11-devel-1:1.1.1w-3.3.el10.x86_64" }, "product_reference": "alt-openssl11-devel-1:1.1.1w-3.3.el10.x86_64", "relates_to_product_reference": "CentOS-10" }, { "category": "default_component_of", "full_product_name": { "name": "alt-openssl11-1:1.1.1w-3.2.el10.x86_64 as a component of Community Enterprise Operating System 10", "product_id": "CentOS-10:alt-openssl11-1:1.1.1w-3.2.el10.x86_64" }, "product_reference": "alt-openssl11-1:1.1.1w-3.2.el10.x86_64", "relates_to_product_reference": "CentOS-10" }, { "category": "default_component_of", "full_product_name": { "name": "alt-openssl11-1:1.1.1w-3.1.el10.x86_64 as a component of Community Enterprise Operating System 10", "product_id": "CentOS-10:alt-openssl11-1:1.1.1w-3.1.el10.x86_64" }, "product_reference": "alt-openssl11-1:1.1.1w-3.1.el10.x86_64", "relates_to_product_reference": "CentOS-10" }, { "category": "default_component_of", "full_product_name": { "name": "alt-openssl11-1:1.1.1w-3.3.el10.x86_64 as a component of Community Enterprise Operating System 10", "product_id": "CentOS-10:alt-openssl11-1:1.1.1w-3.3.el10.x86_64" }, "product_reference": "alt-openssl11-1:1.1.1w-3.3.el10.x86_64", "relates_to_product_reference": "CentOS-10" } ] }, "vulnerabilities": [ { "cve": "CVE-2021-23841", "cwe": { "id": "CWE-190", "name": "Integer Overflow or Wraparound" }, "notes": [ { "category": "description", "text": "The OpenSSL public API function X509_issuer_and_serial_hash() attempts to create a unique hash value based on the issuer and serial number data contained within an X509 certificate. However it fails to correctly handle any errors that may occur while parsing the issuer field (which might occur if the issuer field is maliciously constructed). This may subsequently result in a NULL pointer deref and a crash leading to a potential denial of service attack. The function X509_issuer_and_serial_hash() is never directly called by OpenSSL itself so applications are only vulnerable if they use this function directly and they use it on certificates that may have been obtained from untrusted sources. OpenSSL versions 1.1.1i and below are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1j. OpenSSL versions 1.0.2x and below are affected by this issue. However OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i). Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x).", "title": "Vulnerability description" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "CentOS-10:alt-openssl11-1:1.1.1w-3.1.el10.x86_64", "CentOS-10:alt-openssl11-1:1.1.1w-3.2.el10.x86_64", "CentOS-10:alt-openssl11-1:1.1.1w-3.3.el10.x86_64", "CentOS-10:alt-openssl11-devel-1:1.1.1w-3.1.el10.x86_64", "CentOS-10:alt-openssl11-devel-1:1.1.1w-3.2.el10.x86_64", "CentOS-10:alt-openssl11-devel-1:1.1.1w-3.3.el10.x86_64", "CentOS-10:alt-openssl11-libs-1:1.1.1w-3.1.el10.x86_64", "CentOS-10:alt-openssl11-libs-1:1.1.1w-3.2.el10.x86_64", "CentOS-10:alt-openssl11-libs-1:1.1.1w-3.3.el10.x86_64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els-lang/cve/CVE-2021-23841" }, { "category": "external", "summary": "http://seclists.org/fulldisclosure/2021/May/67", "url": "http://seclists.org/fulldisclosure/2021/May/67" }, { "category": "external", "summary": "http://seclists.org/fulldisclosure/2021/May/68", "url": "http://seclists.org/fulldisclosure/2021/May/68" }, { "category": "external", "summary": "http://seclists.org/fulldisclosure/2021/May/70", "url": "http://seclists.org/fulldisclosure/2021/May/70" }, { "category": "external", "summary": "https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf", "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf" }, { "category": "external", "summary": "https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=122a19ab48091c657f7cb1fb3af9fc07bd557bbf", "url": "https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=122a19ab48091c657f7cb1fb3af9fc07bd557bbf" }, { "category": "external", "summary": "https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=8252ee4d90f3f2004d3d0aeeed003ad49c9a7807", "url": "https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=8252ee4d90f3f2004d3d0aeeed003ad49c9a7807" }, { "category": "external", "summary": "https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44846", "url": "https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44846" }, { "category": "external", "summary": "https://security.gentoo.org/glsa/202103-03", "url": "https://security.gentoo.org/glsa/202103-03" }, { "category": "external", "summary": "https://security.netapp.com/advisory/ntap-20210219-0009/", "url": "https://security.netapp.com/advisory/ntap-20210219-0009/" }, { "category": "external", "summary": "https://security.netapp.com/advisory/ntap-20210513-0002/", "url": "https://security.netapp.com/advisory/ntap-20210513-0002/" }, { "category": "external", "summary": "https://security.netapp.com/advisory/ntap-20240621-0006/", "url": "https://security.netapp.com/advisory/ntap-20240621-0006/" }, { "category": "external", "summary": "https://support.apple.com/kb/HT212528", "url": "https://support.apple.com/kb/HT212528" }, { "category": "external", "summary": "https://support.apple.com/kb/HT212529", "url": "https://support.apple.com/kb/HT212529" }, { "category": "external", "summary": "https://support.apple.com/kb/HT212534", "url": "https://support.apple.com/kb/HT212534" }, { "category": "external", "summary": "https://www.debian.org/security/2021/dsa-4855", "url": "https://www.debian.org/security/2021/dsa-4855" }, { "category": "external", "summary": "https://www.openssl.org/news/secadv/20210216.txt", "url": "https://www.openssl.org/news/secadv/20210216.txt" }, { "category": "external", "summary": "https://www.oracle.com//security-alerts/cpujul2021.html", "url": "https://www.oracle.com//security-alerts/cpujul2021.html" }, { "category": "external", "summary": "https://www.oracle.com/security-alerts/cpuApr2021.html", "url": "https://www.oracle.com/security-alerts/cpuApr2021.html" }, { "category": "external", "summary": "https://www.oracle.com/security-alerts/cpuapr2022.html", "url": "https://www.oracle.com/security-alerts/cpuapr2022.html" }, { "category": "external", "summary": "https://www.oracle.com/security-alerts/cpuoct2021.html", "url": "https://www.oracle.com/security-alerts/cpuoct2021.html" }, { "category": "external", "summary": "https://www.tenable.com/security/tns-2021-03", "url": "https://www.tenable.com/security/tns-2021-03" }, { "category": "external", "summary": "https://www.tenable.com/security/tns-2021-09", "url": "https://www.tenable.com/security/tns-2021-09" } ], "release_date": "2021-02-16T17:15:00Z", "scores": [ { "cvss_v2": { "accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P", "version": "2.0" }, "cvss_v3": { "attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1" }, "products": [ "CentOS-10:alt-openssl11-1:1.1.1w-3.1.el10.x86_64", "CentOS-10:alt-openssl11-1:1.1.1w-3.2.el10.x86_64", "CentOS-10:alt-openssl11-1:1.1.1w-3.3.el10.x86_64", "CentOS-10:alt-openssl11-devel-1:1.1.1w-3.1.el10.x86_64", "CentOS-10:alt-openssl11-devel-1:1.1.1w-3.2.el10.x86_64", "CentOS-10:alt-openssl11-devel-1:1.1.1w-3.3.el10.x86_64", "CentOS-10:alt-openssl11-libs-1:1.1.1w-3.1.el10.x86_64", "CentOS-10:alt-openssl11-libs-1:1.1.1w-3.2.el10.x86_64", "CentOS-10:alt-openssl11-libs-1:1.1.1w-3.3.el10.x86_64" ] } ], "threats": [ { "category": "impact", "details": "Moderate" } ] } ] }