{"id":"CVE-2019-1551","title":"There is an overflow bug in the x64_64 Montgomery squaring procedure used in exponentiation with 512-bit moduli","summary":"There is an overflow bug in the x64_64 Montgomery squaring procedure used in exponentiation with 512-bit moduli. No EC algorithms are affected. Analysis suggests that attacks against 2-prime RSA1024, 3-prime RSA1536, and DSA1024 as a res…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","cwe":["CWE-190"],"vendor":"openssl","product":"openssl","affected":["openssl >= 1.0.2, <= 1.0.2t","openssl >= 1.1.1, <= 1.1.1d","leap = 15.1","enterprise_manager_ops_center = 12.4.0.0","mysql_enterprise_monitor <= 4.0.12","mysql_enterprise_monitor >= 8.0.0, <= 8.0.20","peoplesoft_enterprise_peopletools = 8.56","peoplesoft_enterprise_peopletools = 8.57","peoplesoft_enterprise_peopletools = 8.58","ubuntu_linux = 16.04","ubuntu_linux = 18.04","ubuntu_linux = 19.10","fedora = 30","fedora = 31","fedora = 32","debian_linux = 9.0","debian_linux = 10.0","log_correlation_engine < 6.0.9"],"patched":["log_correlation_engine 6.0.9"],"published":"2019-12-06","updated":"2026-10-08","sourceUpdated":"2026-10-08T22:16:51.970","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2019-1551","references":[{"url":"http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00030.html","label":"openssl-security@openssl.org"},{"url":"http://packetstormsecurity.com/files/155754/Slackware-Security-Advisory-openssl-Updates.html","label":"openssl-security@openssl.org"},{"url":"https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=419102400a2811582a7a3d4a4e317d72e5ce0a8f","label":"openssl-security@openssl.org"},{"url":"https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=f1c5eea8a817075d31e43f5876993c6710238c98","label":"openssl-security@openssl.org"},{"url":"https://lists.debian.org/debian-lts-announce/2022/03/msg00023.html","label":"openssl-security@openssl.org"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DDHOAATPWJCXRNFMJ2SASDBBNU5RJONY/","label":"openssl-security@openssl.org"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EXDDAOWSAIEFQNBHWYE6PPYFV4QXGMCD/","label":"openssl-security@openssl.org"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XVEP3LAK4JSPRXFO4QF4GG2IVXADV3SO/","label":"openssl-security@openssl.org"},{"url":"https://seclists.org/bugtraq/2019/Dec/39","label":"openssl-security@openssl.org"},{"url":"https://seclists.org/bugtraq/2019/Dec/46","label":"openssl-security@openssl.org"},{"url":"https://security.gentoo.org/glsa/202004-10","label":"openssl-security@openssl.org"},{"url":"https://security.netapp.com/advisory/ntap-20191210-0001/","label":"openssl-security@openssl.org"},{"url":"https://usn.ubuntu.com/4376-1/","label":"openssl-security@openssl.org"},{"url":"https://usn.ubuntu.com/4504-1/","label":"openssl-security@openssl.org"},{"url":"https://www.debian.org/security/2019/dsa-4594","label":"openssl-security@openssl.org"},{"url":"https://www.debian.org/security/2021/dsa-4855","label":"openssl-security@openssl.org"},{"url":"https://www.openssl.org/news/secadv/20191206.txt","label":"openssl-security@openssl.org"},{"url":"https://www.oracle.com/security-alerts/cpuApr2021.html","label":"openssl-security@openssl.org"},{"url":"https://www.oracle.com/security-alerts/cpujan2021.html","label":"openssl-security@openssl.org"},{"url":"https://www.oracle.com/security-alerts/cpujul2020.html","label":"openssl-security@openssl.org"},{"url":"https://www.tenable.com/security/tns-2019-09","label":"openssl-security@openssl.org"},{"url":"https://www.tenable.com/security/tns-2020-03","label":"openssl-security@openssl.org"},{"url":"https://www.tenable.com/security/tns-2020-11","label":"openssl-security@openssl.org"},{"url":"https://www.tenable.com/security/tns-2021-10","label":"openssl-security@openssl.org"},{"url":"http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00030.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://packetstormsecurity.com/files/155754/Slackware-Security-Advisory-openssl-Updates.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=419102400a2811582a7a3d4a4e317d72e5ce0a8f","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=f1c5eea8a817075d31e43f5876993c6710238c98","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2022/03/msg00023.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DDHOAATPWJCXRNFMJ2SASDBBNU5RJONY/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EXDDAOWSAIEFQNBHWYE6PPYFV4QXGMCD/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XVEP3LAK4JSPRXFO4QF4GG2IVXADV3SO/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://seclists.org/bugtraq/2019/Dec/39","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://seclists.org/bugtraq/2019/Dec/46","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.gentoo.org/glsa/202004-10","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20191210-0001/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://usn.ubuntu.com/4376-1/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://usn.ubuntu.com/4504-1/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.debian.org/security/2019/dsa-4594","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.debian.org/security/2021/dsa-4855","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.openssl.org/news/secadv/20191206.txt","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com/security-alerts/cpuApr2021.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com/security-alerts/cpujan2021.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com/security-alerts/cpujul2020.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.tenable.com/security/tns-2019-09","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.tenable.com/security/tns-2020-03","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.tenable.com/security/tns-2020-11","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.tenable.com/security/tns-2021-10","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2019/cve-2019-1551.json"},{"url":"https://access.redhat.com/security/cve/CVE-2019-1551"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1780995"},{"url":"https://www.cve.org/CVERecord?id=CVE-2019-1551"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-1551"},{"url":"https://github.com/openssl/openssl/pull/10575"},{"url":"https://access.redhat.com/errata/RHSA-2020:4384"},{"url":"https://access.redhat.com/errata/RHSA-2020:4514"},{"url":"https://access.redhat.com/errata/RHSA-2020:4383"}],"tags":["nvd","csaf","vex","red-hat","cve.org"],"epss":0.14298,"epssPercentile":0.96585,"ingestedAt":"2026-10-08T23:16:47.301Z","scores":{"nvd":5.3,"vendor":4.8},"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-08T21:04:33.478229Z"},"slug":"CVE-2019-1551","body":"## Overview\n\nThere is an overflow bug in the x64_64 Montgomery squaring procedure used in exponentiation with 512-bit moduli. No EC algorithms are affected. Analysis suggests that attacks against 2-prime RSA1024, 3-prime RSA1536, and DSA1024 as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH512 are considered just feasible. However, for an attack the target would have to re-use the DH512 private key, which is not recommended anyway. Also applications directly using the low level API BN_mod_exp may be affected if they use BN_FLG_CONSTTIME. Fixed in OpenSSL 1.1.1e (Affected 1.1.1-1.1.1d). Fixed in OpenSSL 1.0.2u (Affected 1.0.2-1.0.2t).\n\n## Affected\n\n- `openssl >= 1.0.2, <= 1.0.2t`\n- `openssl >= 1.1.1, <= 1.1.1d`\n- `leap = 15.1`\n- `enterprise_manager_ops_center = 12.4.0.0`\n- `mysql_enterprise_monitor <= 4.0.12`\n- `mysql_enterprise_monitor >= 8.0.0, <= 8.0.20`\n- `peoplesoft_enterprise_peopletools = 8.56`\n- `peoplesoft_enterprise_peopletools = 8.57`\n- `peoplesoft_enterprise_peopletools = 8.58`\n- `ubuntu_linux = 16.04`\n- `ubuntu_linux = 18.04`\n- `ubuntu_linux = 19.10`\n- `fedora = 30`\n- `fedora = 31`\n- `fedora = 32`\n- `debian_linux = 9.0`\n- `debian_linux = 10.0`\n- `log_correlation_engine < 6.0.9`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `log_correlation_engine 6.0.9`\n\n## Vendor advisories\n\n- **RHSA-2020:4384** · Red Hat · fixed in: Red Hat JBoss Core Services on RHEL 6 Server, Red Hat JBoss Core Services on RHEL 7 Server · released 2020-10-28 · [advisory](https://access.redhat.com/errata/RHSA-2020:4384)\n- **RHSA-2020:4514** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 8) · released 2020-11-04 · [advisory](https://access.redhat.com/errata/RHSA-2020:4514)\n- **RHSA-2020:4383** · Red Hat · fixed in: Red Hat JBoss Core Services · released 2020-10-28 · [advisory](https://access.redhat.com/errata/RHSA-2020:4383)\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat JBoss Enterprise Application Platform 6, Red Hat JBoss Enterprise Web Server 2 · no fix planned: Red Hat JBoss Enterprise Application Platform 6, Red Hat JBoss Enterprise Web Server 2, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8 · updated 2026-10-09 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2019/cve-2019-1551.json)","depth":"sunlit","depthScore":32,"depthScoreParts":{"impact":29.2,"likelihood":2.9,"exploitation":0,"ransomware":0},"changes":[]}