CVE-2016-7055
This is because the subroutine in question is not used in operations with the private key itself and an input of the attacker's direct choice.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 14.2%, higher than 97% of all known CVEs. Patch or mitigate before the next change window.
Description
There is a carry propagating bug in the Broadwell-specific Montgomery multiplication procedure in OpenSSL 1.0.2 and 1.1.0 before 1.1.0c that handles input lengths divisible by, but longer than 256 bits. Analysis suggests that attacks against RSA, DSA and DH private keys are impossible. This is because the subroutine in question is not used in operations with the private key itself and an input of the attacker's direct choice. Otherwise the bug can manifest itself as transient authentication and key negotiation failures or reproducible erroneous outcome of public-key operations with specially crafted input. Among EC algorithms only Brainpool P-512 curves are affected and one presumably can attack ECDH key negotiation. Impact was not analyzed in detail, because pre-requisites for attack are considered unlikely. Namely multiple clients have to choose the curve in question and the server has to share the private key among them, neither of which is default behaviour. Even then only clients that chose the curve will be affected.
- CVSS 3.1
- 5.9 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 14.22% probability · 97th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Affected
- openssl/openssl · nodejs/node.js
- Source
- cve@mitre.org
EPSS 14.2% 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://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.htmlPatch, Third Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.htmlPatch, Third Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.htmlPatch, Third Party Advisory
- http://www.securityfocus.com/bid/94242Third Party Advisory, US Government Resource, VDB Entry
- http://www.securitytracker.com/id/1037261Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:2185Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2186Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2187Third Party Advisory
- https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbgn03752en_usThird Party Advisory
- https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03744en_usThird Party Advisory, VDB Entry
- https://security.FreeBSD.org/advisories/FreeBSD-SA-17:02.openssl.ascThird Party Advisory
- https://security.gentoo.org/glsa/201702-07Third Party Advisory
- https://www.openssl.org/news/secadv/20161110.txtVendor Advisory
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.htmlPatch, Third Party Advisory
- https://www.tenable.com/security/tns-2017-04Third Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.htmlPatch, Third Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.htmlPatch, Third Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.htmlPatch, Third Party Advisory
- http://www.securityfocus.com/bid/94242Third Party Advisory, US Government Resource, VDB Entry
- http://www.securitytracker.com/id/1037261Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:2185Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2186Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2187Third Party Advisory
- https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbgn03752en_usThird Party Advisory
- https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03744en_usThird Party Advisory, VDB Entry
- https://security.FreeBSD.org/advisories/FreeBSD-SA-17:02.openssl.ascThird Party Advisory
- https://security.gentoo.org/glsa/201702-07Third Party Advisory
- https://www.openssl.org/news/secadv/20161110.txtVendor Advisory
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.htmlPatch, Third Party Advisory
- https://www.tenable.com/security/tns-2017-04Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.