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Vulnerability record · CVE-2019-1551 · published 6 December 2019

CVE-2019-1551: Openssl integer overflow vulnerability

OOpenssl · Openssl

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 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).

5.3 CVSS 3.1 Medium EPSS 14% · top 3.5% CWE-190 · Integer overflow
5.3CVSS 3.1 base score, v2 5.0
14%EPSS exploitation probability, 30 days
NoNot in CISA KEV
9Affected product versions listed by NVD
48References
17 Jun 2026Last modified by NVD

Description

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 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).

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

9 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00030.html Mailing ListThird Party Advisory
http://packetstormsecurity.com/files/155754/Slackware-Security-Advisory-openssl-Updates.html Third Party AdvisoryVDB Entry
https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=419102400a2811582a7a3d4a4e317d72e5ce0a8f
https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=f1c5eea8a817075d31e43f5876993c6710238c98
https://lists.debian.org/debian-lts-announce/2022/03/msg00023.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DDHOAATPWJCXRNFMJ2SASDB
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EXDDAOWSAIEFQNBHWYE6PPY
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XVEP3LAK4JSPRXFO4QF4GG2
https://seclists.org/bugtraq/2019/Dec/39 Mailing ListThird Party Advisory
https://seclists.org/bugtraq/2019/Dec/46 Mailing ListThird Party Advisory
https://security.gentoo.org/glsa/202004-10 Third Party Advisory
https://security.netapp.com/advisory/ntap-20191210-0001/ Third Party Advisory
https://usn.ubuntu.com/4376-1/ Third Party Advisory
https://usn.ubuntu.com/4504-1/ Third Party Advisory
https://www.debian.org/security/2019/dsa-4594 Third Party Advisory
https://www.debian.org/security/2021/dsa-4855 Third Party Advisory
https://www.openssl.org/news/secadv/20191206.txt Vendor Advisory
https://www.oracle.com/security-alerts/cpuApr2021.html PatchThird Party Advisory
https://www.oracle.com/security-alerts/cpujan2021.html PatchThird Party Advisory
https://www.oracle.com/security-alerts/cpujul2020.html PatchThird Party Advisory
https://www.tenable.com/security/tns-2019-09 Third Party Advisory
https://www.tenable.com/security/tns-2020-03 Third Party Advisory
https://www.tenable.com/security/tns-2020-11 Third Party Advisory
https://www.tenable.com/security/tns-2021-10 Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00030.html Mailing ListThird Party Advisory
http://packetstormsecurity.com/files/155754/Slackware-Security-Advisory-openssl-Updates.html Third Party AdvisoryVDB Entry
https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=419102400a2811582a7a3d4a4e317d72e5ce0a8f
https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=f1c5eea8a817075d31e43f5876993c6710238c98
https://lists.debian.org/debian-lts-announce/2022/03/msg00023.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DDHOAATPWJCXRNFMJ2SASDB
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EXDDAOWSAIEFQNBHWYE6PPY
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XVEP3LAK4JSPRXFO4QF4GG2
https://seclists.org/bugtraq/2019/Dec/39 Mailing ListThird Party Advisory
https://seclists.org/bugtraq/2019/Dec/46 Mailing ListThird Party Advisory
https://security.gentoo.org/glsa/202004-10 Third Party Advisory
https://security.netapp.com/advisory/ntap-20191210-0001/ Third Party Advisory
https://usn.ubuntu.com/4376-1/ Third Party Advisory
https://usn.ubuntu.com/4504-1/ Third Party Advisory
https://www.debian.org/security/2019/dsa-4594 Third Party Advisory
https://www.debian.org/security/2021/dsa-4855 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2019-1551), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.