{ "document": { "aggregate_severity": { "text": "High" }, "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/debian10/vex/2021/cve-2021-4044-els_alt_common-debian10.json" } ], "tracking": { "current_release_date": "2026-06-12T16:34:35Z", "generator": { "date": "2026-06-12T16:34:35Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2021-4044-ELS_ALT_COMMON-DEBIAN10", "initial_release_date": "2021-12-14T19:15:00Z", "revision_history": [ { "date": "2021-12-14T19:15:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-06-12T16:34:35Z", "number": "2", "summary": "Official Publication" } ], "status": "final", "version": "2" }, "title": "Security update on CVE-2021-4044" }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Debian 10", "product": { "name": "Debian 10", "product_id": "Debian-10", "product_identification_helper": { "cpe": "cpe:2.3:o:debian:debian_linux:10:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "Debian" } ], "category": "vendor", "name": "Software in the Public Interest, Inc." }, { "branches": [ { "branches": [ { "category": "product_version", "name": "alt-openssl-libs-0:1.1.1w-3.4.amd64", "product": { "name": "alt-openssl-libs-0:1.1.1w-3.4.amd64", "product_id": "alt-openssl-libs-0:1.1.1w-3.4.amd64", "product_identification_helper": { "purl": "pkg:deb/tuxcare/alt-openssl-libs@1.1.1w-3.4?arch=amd64&os_name=debian&os_version=10" } } }, { "category": "product_version", "name": "alt-openssl-libs-0:1.1.1w-3.1.amd64", "product": { "name": "alt-openssl-libs-0:1.1.1w-3.1.amd64", "product_id": "alt-openssl-libs-0:1.1.1w-3.1.amd64", "product_identification_helper": { "purl": "pkg:deb/tuxcare/alt-openssl-libs@1.1.1w-3.1?arch=amd64&os_name=debian&os_version=10" } } }, { "category": "product_version", "name": "alt-openssl-libs-0:1.1.1w-3.2.amd64", "product": { "name": "alt-openssl-libs-0:1.1.1w-3.2.amd64", "product_id": "alt-openssl-libs-0:1.1.1w-3.2.amd64", "product_identification_helper": { "purl": "pkg:deb/tuxcare/alt-openssl-libs@1.1.1w-3.2?arch=amd64&os_name=debian&os_version=10" } } }, { "category": "product_version", "name": "alt-openssl-dev-0:1.1.1w-3.2.amd64", "product": { "name": "alt-openssl-dev-0:1.1.1w-3.2.amd64", "product_id": "alt-openssl-dev-0:1.1.1w-3.2.amd64", "product_identification_helper": { "purl": "pkg:deb/tuxcare/alt-openssl-dev@1.1.1w-3.2?arch=amd64&os_name=debian&os_version=10" } } }, { "category": "product_version", "name": "alt-openssl-dev-0:1.1.1w-3.4.amd64", "product": { "name": "alt-openssl-dev-0:1.1.1w-3.4.amd64", "product_id": "alt-openssl-dev-0:1.1.1w-3.4.amd64", "product_identification_helper": { "purl": "pkg:deb/tuxcare/alt-openssl-dev@1.1.1w-3.4?arch=amd64&os_name=debian&os_version=10" } } }, { "category": "product_version", "name": "alt-openssl-dev-0:1.1.1w-3.1.amd64", "product": { "name": "alt-openssl-dev-0:1.1.1w-3.1.amd64", "product_id": "alt-openssl-dev-0:1.1.1w-3.1.amd64", "product_identification_helper": { "purl": "pkg:deb/tuxcare/alt-openssl-dev@1.1.1w-3.1?arch=amd64&os_name=debian&os_version=10" } } }, { "category": "product_version", "name": "alt-openssl-0:1.1.1w-3.2.amd64", "product": { "name": "alt-openssl-0:1.1.1w-3.2.amd64", "product_id": "alt-openssl-0:1.1.1w-3.2.amd64", "product_identification_helper": { "purl": "pkg:deb/tuxcare/alt-openssl@1.1.1w-3.2?arch=amd64&os_name=debian&os_version=10" } } }, { "category": "product_version", "name": "alt-openssl-0:1.1.1w-3.1.amd64", "product": { "name": "alt-openssl-0:1.1.1w-3.1.amd64", "product_id": "alt-openssl-0:1.1.1w-3.1.amd64", "product_identification_helper": { "purl": "pkg:deb/tuxcare/alt-openssl@1.1.1w-3.1?arch=amd64&os_name=debian&os_version=10" } } }, { "category": "product_version", "name": "alt-openssl-0:1.1.1w-3.4.amd64", "product": { "name": "alt-openssl-0:1.1.1w-3.4.amd64", "product_id": "alt-openssl-0:1.1.1w-3.4.amd64", "product_identification_helper": { "purl": "pkg:deb/tuxcare/alt-openssl@1.1.1w-3.4?arch=amd64&os_name=debian&os_version=10" } } } ], "category": "architecture", "name": "amd64" }, { "branches": [ { "category": "product_version", "name": "alt-openssl-doc-0:1.1.1w-3.1.all", "product": { "name": "alt-openssl-doc-0:1.1.1w-3.1.all", "product_id": "alt-openssl-doc-0:1.1.1w-3.1.all", "product_identification_helper": { "purl": "pkg:deb/tuxcare/alt-openssl-doc@1.1.1w-3.1?arch=all&os_name=debian&os_version=10" } } }, { "category": "product_version", "name": "alt-openssl-doc-0:1.1.1w-3.2.all", "product": { "name": "alt-openssl-doc-0:1.1.1w-3.2.all", "product_id": "alt-openssl-doc-0:1.1.1w-3.2.all", "product_identification_helper": { "purl": "pkg:deb/tuxcare/alt-openssl-doc@1.1.1w-3.2?arch=all&os_name=debian&os_version=10" } } }, { "category": "product_version", "name": "alt-openssl-doc-0:1.1.1w-3.4.all", "product": { "name": "alt-openssl-doc-0:1.1.1w-3.4.all", "product_id": "alt-openssl-doc-0:1.1.1w-3.4.all", "product_identification_helper": { "purl": "pkg:deb/tuxcare/alt-openssl-doc@1.1.1w-3.4?arch=all&os_name=debian&os_version=10" } } } ], "category": "architecture", "name": "all" } ], "category": "vendor", "name": "TuxCare" } ], "relationships": [ { "category": "default_component_of", "full_product_name": { "name": "alt-openssl-libs-0:1.1.1w-3.4.amd64 as a component of Debian 10", "product_id": "Debian-10:alt-openssl-libs-0:1.1.1w-3.4.amd64" }, "product_reference": "alt-openssl-libs-0:1.1.1w-3.4.amd64", "relates_to_product_reference": "Debian-10" }, { "category": "default_component_of", "full_product_name": { "name": "alt-openssl-libs-0:1.1.1w-3.1.amd64 as a component of Debian 10", "product_id": "Debian-10:alt-openssl-libs-0:1.1.1w-3.1.amd64" }, "product_reference": "alt-openssl-libs-0:1.1.1w-3.1.amd64", "relates_to_product_reference": "Debian-10" }, { "category": "default_component_of", "full_product_name": { "name": "alt-openssl-libs-0:1.1.1w-3.2.amd64 as a component of Debian 10", "product_id": "Debian-10:alt-openssl-libs-0:1.1.1w-3.2.amd64" }, "product_reference": "alt-openssl-libs-0:1.1.1w-3.2.amd64", "relates_to_product_reference": "Debian-10" }, { "category": "default_component_of", "full_product_name": { "name": "alt-openssl-dev-0:1.1.1w-3.2.amd64 as a component of Debian 10", "product_id": "Debian-10:alt-openssl-dev-0:1.1.1w-3.2.amd64" }, "product_reference": "alt-openssl-dev-0:1.1.1w-3.2.amd64", "relates_to_product_reference": "Debian-10" }, { "category": "default_component_of", "full_product_name": { "name": "alt-openssl-dev-0:1.1.1w-3.4.amd64 as a component of Debian 10", "product_id": "Debian-10:alt-openssl-dev-0:1.1.1w-3.4.amd64" }, "product_reference": "alt-openssl-dev-0:1.1.1w-3.4.amd64", "relates_to_product_reference": "Debian-10" }, { "category": "default_component_of", "full_product_name": { "name": "alt-openssl-dev-0:1.1.1w-3.1.amd64 as a component of Debian 10", "product_id": "Debian-10:alt-openssl-dev-0:1.1.1w-3.1.amd64" }, "product_reference": "alt-openssl-dev-0:1.1.1w-3.1.amd64", "relates_to_product_reference": "Debian-10" }, { "category": "default_component_of", "full_product_name": { "name": "alt-openssl-doc-0:1.1.1w-3.1.all as a component of Debian 10", "product_id": "Debian-10:alt-openssl-doc-0:1.1.1w-3.1.all" }, "product_reference": "alt-openssl-doc-0:1.1.1w-3.1.all", "relates_to_product_reference": "Debian-10" }, { "category": "default_component_of", "full_product_name": { "name": "alt-openssl-doc-0:1.1.1w-3.2.all as a component of Debian 10", "product_id": "Debian-10:alt-openssl-doc-0:1.1.1w-3.2.all" }, "product_reference": "alt-openssl-doc-0:1.1.1w-3.2.all", "relates_to_product_reference": "Debian-10" }, { "category": "default_component_of", "full_product_name": { "name": "alt-openssl-doc-0:1.1.1w-3.4.all as a component of Debian 10", "product_id": "Debian-10:alt-openssl-doc-0:1.1.1w-3.4.all" }, "product_reference": "alt-openssl-doc-0:1.1.1w-3.4.all", "relates_to_product_reference": "Debian-10" }, { "category": "default_component_of", "full_product_name": { "name": "alt-openssl-0:1.1.1w-3.2.amd64 as a component of Debian 10", "product_id": "Debian-10:alt-openssl-0:1.1.1w-3.2.amd64" }, "product_reference": "alt-openssl-0:1.1.1w-3.2.amd64", "relates_to_product_reference": "Debian-10" }, { "category": "default_component_of", "full_product_name": { "name": "alt-openssl-0:1.1.1w-3.1.amd64 as a component of Debian 10", "product_id": "Debian-10:alt-openssl-0:1.1.1w-3.1.amd64" }, "product_reference": "alt-openssl-0:1.1.1w-3.1.amd64", "relates_to_product_reference": "Debian-10" }, { "category": "default_component_of", "full_product_name": { "name": "alt-openssl-0:1.1.1w-3.4.amd64 as a component of Debian 10", "product_id": "Debian-10:alt-openssl-0:1.1.1w-3.4.amd64" }, "product_reference": "alt-openssl-0:1.1.1w-3.4.amd64", "relates_to_product_reference": "Debian-10" } ] }, "vulnerabilities": [ { "cve": "CVE-2021-4044", "cwe": { "id": "CWE-835", "name": "Loop with Unreachable Exit Condition ('Infinite Loop')" }, "notes": [ { "category": "description", "text": "Internally libssl in OpenSSL calls X509_verify_cert() on the client side to verify a certificate supplied by a server. That function may return a negative return value to indicate an internal error (for example out of memory). Such a negative return value is mishandled by OpenSSL and will cause an IO function (such as SSL_connect() or SSL_do_handshake()) to not indicate success and a subsequent call to SSL_get_error() to return the value SSL_ERROR_WANT_RETRY_VERIFY. This return value is only supposed to be returned by OpenSSL if the application has previously called SSL_CTX_set_cert_verify_callback(). Since most applications do not do this the SSL_ERROR_WANT_RETRY_VERIFY return value from SSL_get_error() will be totally unexpected and applications may not behave correctly as a result. The exact behaviour will depend on the application but it could result in crashes, infinite loops or other similar incorrect responses. This issue is made more serious in combination with a separate bug in OpenSSL 3.0 that will cause X509_verify_cert() to indicate an internal error when processing a certificate chain. This will occur where a certificate does not include the Subject Alternative Name extension but where a Certificate Authority has enforced name constraints. This issue can occur even with valid chains. By combining the two issues an attacker could induce incorrect, application dependent behaviour. Fixed in OpenSSL 3.0.1 (Affected 3.0.0).", "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" }, { "category": "other", "text": "TuxCare has assessed that this vulnerability does not impact any currently supported TuxCare products. This evaluation may change as new information becomes available. For additional details regarding this vulnerability and affected products, refer to the provided references.", "title": "Statement" } ], "product_status": { "known_not_affected": [ "Debian-10:alt-openssl-0:1.1.1w-3.1.amd64", "Debian-10:alt-openssl-0:1.1.1w-3.2.amd64", "Debian-10:alt-openssl-0:1.1.1w-3.4.amd64", "Debian-10:alt-openssl-dev-0:1.1.1w-3.1.amd64", "Debian-10:alt-openssl-dev-0:1.1.1w-3.2.amd64", "Debian-10:alt-openssl-dev-0:1.1.1w-3.4.amd64", "Debian-10:alt-openssl-doc-0:1.1.1w-3.1.all", "Debian-10:alt-openssl-doc-0:1.1.1w-3.2.all", "Debian-10:alt-openssl-doc-0:1.1.1w-3.4.all", "Debian-10:alt-openssl-libs-0:1.1.1w-3.1.amd64", "Debian-10:alt-openssl-libs-0:1.1.1w-3.2.amd64", "Debian-10:alt-openssl-libs-0:1.1.1w-3.4.amd64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els-lang/cve/CVE-2021-4044" }, { "category": "external", "summary": "https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=758754966791c537ea95241438454aa86f91f256", "url": "https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=758754966791c537ea95241438454aa86f91f256" }, { "category": "external", "summary": "https://security.netapp.com/advisory/ntap-20211229-0003/", "url": "https://security.netapp.com/advisory/ntap-20211229-0003/" }, { "category": "external", "summary": "https://www.openssl.org/news/secadv/20211214.txt", "url": "https://www.openssl.org/news/secadv/20211214.txt" } ], "release_date": "2021-12-14T19:15:00Z", "scores": [ { "cvss_v2": { "accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.0, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0" }, "cvss_v3": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1" }, "products": [ "Debian-10:alt-openssl-0:1.1.1w-3.1.amd64", "Debian-10:alt-openssl-0:1.1.1w-3.2.amd64", "Debian-10:alt-openssl-0:1.1.1w-3.4.amd64", "Debian-10:alt-openssl-dev-0:1.1.1w-3.1.amd64", "Debian-10:alt-openssl-dev-0:1.1.1w-3.2.amd64", "Debian-10:alt-openssl-dev-0:1.1.1w-3.4.amd64", "Debian-10:alt-openssl-doc-0:1.1.1w-3.1.all", "Debian-10:alt-openssl-doc-0:1.1.1w-3.2.all", "Debian-10:alt-openssl-doc-0:1.1.1w-3.4.all", "Debian-10:alt-openssl-libs-0:1.1.1w-3.1.amd64", "Debian-10:alt-openssl-libs-0:1.1.1w-3.2.amd64", "Debian-10:alt-openssl-libs-0:1.1.1w-3.4.amd64" ] } ], "threats": [ { "category": "impact", "details": "Important" }, { "category": "impact", "date": "2026-06-12T13:13:15.684340Z", "details": "important", "product_ids": [ "Debian-10:alt-openssl-0:1.1.1w-3.1.amd64", "Debian-10:alt-openssl-0:1.1.1w-3.2.amd64", "Debian-10:alt-openssl-0:1.1.1w-3.4.amd64", "Debian-10:alt-openssl-dev-0:1.1.1w-3.1.amd64", "Debian-10:alt-openssl-dev-0:1.1.1w-3.2.amd64", "Debian-10:alt-openssl-dev-0:1.1.1w-3.4.amd64", "Debian-10:alt-openssl-doc-0:1.1.1w-3.1.all", "Debian-10:alt-openssl-doc-0:1.1.1w-3.2.all", "Debian-10:alt-openssl-doc-0:1.1.1w-3.4.all", "Debian-10:alt-openssl-libs-0:1.1.1w-3.1.amd64", "Debian-10:alt-openssl-libs-0:1.1.1w-3.2.amd64", "Debian-10:alt-openssl-libs-0:1.1.1w-3.4.amd64" ] } ] } ] }