CVE-2017-3732: OpenSSL vulnerability

CVE-2017-3732: BN_mod_exp may produce incorrect results on x86_64

There is a carry propagating bug in the x86_64 Montgomery squaring procedure in OpenSSL 1.0.2 before 1.0.2k and 1.1.0 before 1.1.0d. No EC algorithms are affected. Analysis suggests that attacks against RSA and DSA as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH are considered just feasible (although very difficult) because most of the work necessary to deduce information about a private key may be performed offline. The amount of resources required for such an attack would be very significant and likely only accessible to a limited number of attackers. An attacker would additionally need online access to an unpatched system using the target private key in a scenario with persistent DH parameters and a private key that is shared between multiple clients. For example this can occur by default in OpenSSL DHE based SSL/TLS ciphersuites. Note: This issue is very similar to CVE-2015-3193 but must be treated as a separate problem.

UnknownCVSS not scoredNot KEV-listedUpdatedSep 16, 2024, 22:08 UTC (UTC+00:00)

Security readout for executives and security teams

This is an OpenSSL math bug on x86_64 systems that can produce wrong cryptographic results. The main realistic concern is difficult key-recovery against certain Diffie-Hellman TLS configurations. The sources describe exploitation as very resource-intensive and limited to specific conditions, not as broadly practical. Exposure is most relevant to x86_64 systems running affected OpenSSL releases, especially servers using OpenSSL DHE-based SSL/TLS ciphersuites with persistent DH parameters and a private key shared across clients. Treat this as a targeted cryptographic risk, not an emergency wormable issue. Remediate through normal vulnerability management, with higher priority for exposed TLS services, legacy platforms, and products that still carry old OpenSSL builds. Mitigation focus: Upgrade OpenSSL to 1.0.2k, 1.1.0d, or a vendor-fixed package.; Prioritize internet-facing TLS services using affected OpenSSL versions.; Review vendor advisories for platform-specific package names and backported fixes..

Prepared: Jun 13, 2026, 05:01 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: May 4, 2017, 19:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

14Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
RHSA-2018:2185CVE reference · vendor-advisory, x_refsource_REDHAT
RHSA-2018:2186CVE reference · vendor-advisory, x_refsource_REDHAT
RHSA-2018:2713CVE reference · vendor-advisory, x_refsource_REDHAT
https://github.com/openssl/openssl/commit/a59b90bf491410f1f2bc4540cc21f1980fd14c5bCVE reference · x_refsource_MISC
FreeBSD-SA-17:02CVE reference · vendor-advisory, x_refsource_FREEBSD
https://www.openssl.org/news/secadv/20170126.txtCVE reference · x_refsource_CONFIRM
RHSA-2018:2575CVE reference · vendor-advisory, x_refsource_REDHAT
https://www.tenable.com/security/tns-2017-04CVE reference · x_refsource_CONFIRM
GLSA-201702-07CVE reference · vendor-advisory, x_refsource_GENTOO
RHSA-2018:2568CVE reference · vendor-advisory, x_refsource_REDHAT
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03838en_usCVE reference · x_refsource_CONFIRM
RHSA-2018:2187CVE reference · vendor-advisory, x_refsource_REDHAT
https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.htmlCVE reference · x_refsource_MISC

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

OpenSSLOpenSSLopenssl-1.1.0, openssl-1.1.0a, openssl-1.1.0b, openssl-1.1.0c, openssl-1.0.2, openssl-1.0.2a, openssl-1.0.2b, openssl-1.0.2c, openssl-1.0.2d, openssl-1.0.2e, openssl-1.0.2f, openssl-1.0.2g, openssl-1.0.2h, openssl-1.0.2i, openssl-1.0.2jListed

Weakness

CWE details

No CWE listed

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