CVE-2019-1551
There is an overflow bug in the x64_64 Montgomery squaring procedure used in exponentiation with 512-bit moduli.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 14.3%, higher than 97% of all known CVEs. Patch or mitigate before the next change window.
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
- 5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- EPSS
- 14.30% probability · 97th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-190
- Affected
- openssl/openssl · opensuse/leap · oracle/enterprise manager ops center · oracle/mysql enterprise monitor · oracle/peoplesoft enterprise peopletools · canonical/ubuntu linux · fedoraproject/fedora · debian/debian linux · tenable/log correlation engine
- Source
- openssl-security@openssl.org
EPSS 14.3% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00030.htmlMailing List, Third Party Advisory
- http://packetstormsecurity.com/files/155754/Slackware-Security-Advisory-openssl-Updates.htmlThird Party Advisory, VDB 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.htmlMailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DDHOAATPWJCXRNFMJ2SASDBBNU5RJONY/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EXDDAOWSAIEFQNBHWYE6PPYFV4QXGMCD/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XVEP3LAK4JSPRXFO4QF4GG2IVXADV3SO/
- https://seclists.org/bugtraq/2019/Dec/39Mailing List, Third Party Advisory
- https://seclists.org/bugtraq/2019/Dec/46Mailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202004-10Third 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-4594Third Party Advisory
- https://www.debian.org/security/2021/dsa-4855Third Party Advisory
- https://www.openssl.org/news/secadv/20191206.txtVendor Advisory
- https://www.oracle.com/security-alerts/cpuApr2021.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpujan2021.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpujul2020.htmlPatch, Third Party Advisory
- https://www.tenable.com/security/tns-2019-09Third Party Advisory
- https://www.tenable.com/security/tns-2020-03Third Party Advisory
- https://www.tenable.com/security/tns-2020-11Third Party Advisory
- https://www.tenable.com/security/tns-2021-10Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00030.htmlMailing List, Third Party Advisory
- http://packetstormsecurity.com/files/155754/Slackware-Security-Advisory-openssl-Updates.htmlThird Party Advisory, VDB 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.htmlMailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DDHOAATPWJCXRNFMJ2SASDBBNU5RJONY/
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.