{"dataType": "CVE_RECORD", "cveMetadata": {"state": "PUBLISHED", "cveId": "CVE-2021-3449", "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "assignerShortName": "openssl", "dateUpdated": "2026-10-08T21:13:50.095Z", "dateReserved": "2021-03-17T00:00:00.000Z", "datePublished": "2021-03-25T14:25:13.659Z"}, "containers": {"cna": {"title": "NULL pointer deref in signature_algorithms processing", "datePublic": "2021-03-25T00:00:00.000Z", "providerMetadata": {"orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "shortName": "openssl", "dateUpdated": "2024-06-21T19:05:57.096Z"}, "descriptions": [{"lang": "en", "value": "An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation ClientHello message from a client. If a TLSv1.2 renegotiation ClientHello omits the signature_algorithms extension (where it was present in the initial ClientHello), but includes a signature_algorithms_cert extension then a NULL pointer dereference will result, leading to a crash and a denial of service attack. A server is only vulnerable if it has TLSv1.2 and renegotiation enabled (which is the default configuration). OpenSSL TLS clients are not impacted by this issue. All OpenSSL 1.1.1 versions are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1k. OpenSSL 1.0.2 is not impacted by this issue. 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"cveTags": [], "descriptions": [{"lang": "en", "value": "An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation ClientHello message from a client. If a TLSv1.2 renegotiation ClientHello omits the signature_algorithms extension (where it was present in the initial ClientHello), but includes a signature_algorithms_cert extension then a NULL pointer dereference will result, leading to a crash and a denial of service attack. A server is only vulnerable if it has TLSv1.2 and renegotiation enabled (which is the default configuration). OpenSSL TLS clients are not impacted by this issue. All OpenSSL 1.1.1 versions are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1k. OpenSSL 1.0.2 is not impacted by this issue. Fixed in OpenSSL 1.1.1k (Affected 1.1.1-1.1.1j)."}, {"lang": "es", "value": "Un servidor OpenSSL TLS puede cometer un fallo si un cliente env\u00eda un mensaje ClientHello de renegociaci\u00f3n dise\u00f1ado maliciosamente. Si una renegociaci\u00f3n de TLSv1.2 ClientHello omite la extensi\u00f3n signature_algorithms (donde estaba presente en el ClientHello inicial), pero incluye una extensi\u00f3n signature_algorithms_cert, se producir\u00e1 una desreferencia del puntero NULL, lo que conllevar\u00e1 un bloqueo y un ataque de denegaci\u00f3n de servicio. Un servidor solo es vulnerable si tiene TLSv1.2 y la renegociaci\u00f3n habilitada (que es la configuraci\u00f3n predeterminada). Los clientes de OpenSSL TLS no est\u00e1n afectados por este problema. Todas las versiones de OpenSSL versi\u00f3n 1.1.1 est\u00e1n afectadas por este problema. Los usuarios de estas versiones deben actualizar a OpenSSL versi\u00f3n 1.1.1k. OpenSSL versi\u00f3n 1.0.2 no est\u00e1 afectado por este problema. Corregido en OpenSSL versi\u00f3n 1.1.1k (Afectadas versiones 1.1.1-1.1.1j)"}], "id": "CVE-2021-3449", "lastModified": "2026-10-08T22:17:11.243", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 4.3, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", 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"url": "https://www.debian.org/security/2021/dsa-4875"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://www.openssl.org/news/secadv/20210325.txt"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://www.oracle.com//security-alerts/cpujul2021.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://www.oracle.com/security-alerts/cpuApr2021.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://www.oracle.com/security-alerts/cpuapr2022.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://www.oracle.com/security-alerts/cpujul2022.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://www.oracle.com/security-alerts/cpuoct2021.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://www.tenable.com/security/tns-2021-05"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://www.tenable.com/security/tns-2021-06"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://www.tenable.com/security/tns-2021-09"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://www.tenable.com/security/tns-2021-10"}], "sourceIdentifier": "openssl-security@openssl.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"acknowledgement": "Red Hat would like to thank the OpenSSL project for reporting this issue. Upstream acknowledges Nokia as the original reporter.", "affected_release": [{"advisory": "RHSA-2021:1200", "cpe": "cpe:/a:redhat:jboss_core_services:1", "package": "openssl", "product_name": "JBCS 2.4.37 SP7", "release_date": "2021-04-14T00:00:00Z"}, {"advisory": "RHSA-2021:1199", "cpe": "cpe:/a:redhat:jboss_core_services:1::el7", "package": "jbcs-httpd24-httpd-0:2.4.37-70.jbcs.el7", "product_name": "JBoss Core Services on RHEL 7", "release_date": "2021-04-14T00:00:00Z"}, {"advisory": "RHSA-2021:1199", "cpe": "cpe:/a:redhat:jboss_core_services:1::el7", "package": "jbcs-httpd24-mod_cluster-native-0:1.3.14-20.Final_redhat_2.jbcs.el7", "product_name": "JBoss Core Services on RHEL 7", "release_date": "2021-04-14T00:00:00Z"}, {"advisory": "RHSA-2021:1199", "cpe": "cpe:/a:redhat:jboss_core_services:1::el7", "package": "jbcs-httpd24-mod_http2-0:1.15.7-14.jbcs.el7", "product_name": "JBoss Core Services on RHEL 7", "release_date": "2021-04-14T00:00:00Z"}, {"advisory": "RHSA-2021:1199", "cpe": "cpe:/a:redhat:jboss_core_services:1::el7", "package": "jbcs-httpd24-mod_jk-0:1.2.48-13.redhat_1.jbcs.el7", "product_name": "JBoss Core Services on RHEL 7", "release_date": "2021-04-14T00:00:00Z"}, {"advisory": "RHSA-2021:1199", "cpe": "cpe:/a:redhat:jboss_core_services:1::el7", "package": "jbcs-httpd24-mod_md-1:2.0.8-33.jbcs.el7", "product_name": "JBoss Core Services on RHEL 7", "release_date": "2021-04-14T00:00:00Z"}, {"advisory": "RHSA-2021:1199", "cpe": "cpe:/a:redhat:jboss_core_services:1::el7", "package": "jbcs-httpd24-mod_security-0:2.9.2-60.GA.jbcs.el7", "product_name": "JBoss Core Services on RHEL 7", "release_date": "2021-04-14T00:00:00Z"}, {"advisory": "RHSA-2021:1199", "cpe": "cpe:/a:redhat:jboss_core_services:1::el7", "package": "jbcs-httpd24-nghttp2-0:1.39.2-37.jbcs.el7", "product_name": "JBoss Core Services on RHEL 7", "release_date": "2021-04-14T00:00:00Z"}, {"advisory": "RHSA-2021:1199", "cpe": "cpe:/a:redhat:jboss_core_services:1::el7", "package": "jbcs-httpd24-openssl-1:1.1.1g-6.jbcs.el7", "product_name": "JBoss Core Services on RHEL 7", "release_date": "2021-04-14T00:00:00Z"}, {"advisory": "RHSA-2021:1199", "cpe": "cpe:/a:redhat:jboss_core_services:1::el7", "package": "jbcs-httpd24-openssl-chil-0:1.0.0-5.jbcs.el7", "product_name": "JBoss Core Services on RHEL 7", "release_date": "2021-04-14T00:00:00Z"}, {"advisory": "RHSA-2021:1199", "cpe": "cpe:/a:redhat:jboss_core_services:1::el7", "package": "jbcs-httpd24-openssl-pkcs11-0:0.4.10-20.jbcs.el7", "product_name": "JBoss Core Services on RHEL 7", "release_date": "2021-04-14T00:00:00Z"}, {"advisory": "RHSA-2021:1024", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "openssl-1:1.1.1g-15.el8_3", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-03-30T00:00:00Z"}, {"advisory": "RHSA-2021:1131", "cpe": "cpe:/o:redhat:rhel_eus:8.1", "package": "openssl-1:1.1.1c-5.el8_1", "product_name": "Red Hat Enterprise Linux 8.1 Extended Update Support", "release_date": "2021-04-07T00:00:00Z"}, {"advisory": "RHSA-2021:1063", "cpe": "cpe:/o:redhat:rhel_eus:8.2", "package": "openssl-1:1.1.1c-18.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2021-04-05T00:00:00Z"}, {"advisory": "RHSA-2021:1203", "cpe": "cpe:/a:redhat:jboss_enterprise_web_server:3.1", "product_name": "Red Hat JBoss Web Server 3.1", "release_date": "2021-04-14T00:00:00Z"}, {"advisory": "RHSA-2021:1202", "cpe": "cpe:/a:redhat:jboss_enterprise_web_server:3.1::el7", "package": "tomcat-native-0:1.2.23-24.redhat_24.ep7.el7", "product_name": "Red Hat JBoss Web Server 3 for RHEL 7", "release_date": "2021-04-14T00:00:00Z"}, {"advisory": "RHSA-2021:1196", "cpe": "cpe:/a:redhat:jboss_enterprise_web_server:5.4", "product_name": "Red Hat JBoss Web Server 5", "release_date": "2021-04-14T00:00:00Z"}, {"advisory": "RHSA-2021:1195", "cpe": "cpe:/a:redhat:jboss_enterprise_web_server:5.4::el7", "package": "jws5-tomcat-native-0:1.2.25-4.redhat_4.el7jws", "product_name": "Red Hat JBoss Web Server 5.4 on RHEL 7", "release_date": "2021-04-14T00:00:00Z"}, {"advisory": "RHSA-2021:1195", "cpe": "cpe:/a:redhat:jboss_enterprise_web_server:5.4::el8", "package": "jws5-tomcat-native-0:1.2.25-4.redhat_4.el8jws", "product_name": "Red Hat JBoss Web Server 5.4 on RHEL 8", "release_date": "2021-04-14T00:00:00Z"}, {"advisory": "RHSA-2021:1189", "cpe": "cpe:/o:redhat:rhev_hypervisor:4.4::el8", "package": "redhat-virtualization-host-0:4.4.5-20210330.0.el8_3", "product_name": "Red Hat Virtualization 4 for Red Hat Enterprise Linux 8", "release_date": "2021-04-14T00:00:00Z"}], "bugzilla": {"description": "openssl: NULL pointer dereference in signature_algorithms processing", "id": "1941554", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1941554"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "details": ["An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation ClientHello message from a client. If a TLSv1.2 renegotiation ClientHello omits the signature_algorithms extension (where it was present in the initial ClientHello), but includes a signature_algorithms_cert extension then a NULL pointer dereference will result, leading to a crash and a denial of service attack. A server is only vulnerable if it has TLSv1.2 and renegotiation enabled (which is the default configuration). OpenSSL TLS clients are not impacted by this issue. All OpenSSL 1.1.1 versions are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1k. OpenSSL 1.0.2 is not impacted by this issue. Fixed in OpenSSL 1.1.1k (Affected 1.1.1-1.1.1j).", "A flaw was found in openssl. A server crash and denial of service attack could occur if a client sends a TLSv1.2 renegotiation ClientHello and omits the signature_algorithms extension but includes a signature_algorithms_cert extension. The highest threat from this vulnerability is to system availability."], "mitigation": {"lang": "en:us", "value": "This flaw can be mitigated by disabling TLS renegotiation on servers compiled with OpenSSL. It is enabled by default, but can be disabled for servers which do not require it and can be used to mitigate this flaw. Versions of httpd package shipped with Red Hat Enterprise Linux 8 have TLS renegotiation disabled by default."}, "name": "CVE-2021-3449", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "openssl", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "openssl098e", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "openssl", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "openssl098e", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "compat-openssl10", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "openssl", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2021-03-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-3449\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-3449\nhttps://www.openssl.org/news/secadv/20210325.txt"], "statement": "This flaw only affects OpenSSL 1.1.1, older versions are not affected.", "threat_severity": "Important"}

{}