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CVE-2018-0737

28
FAUCET Score

CVE-2018-0737 describes a cache timing side-channel vulnerability in the OpenSSL RSA key generation algorithm, affecting versions 1.1.0 through 1.1.0h and 1.0.2b through 1.0.2o, including Canonical Ubuntu Linux. Rated Medium (CVSS 5.9), an attacker with sufficient access to mount cache timing attacks during RSA key generation could potentially recover the private key, posing a high confidentiality risk. While there is no known active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has received some community attention and media coverage, indicating awareness of the potential threat.

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.0.2b, <= 1.0.2oCPE matchmatch criteria
cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
>= 1.1.0, <= 1.1.0hCPE matchmatch criteria
cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
14.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
16.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
17.10CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:17.10:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.9MEDIUM

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
12.05%
Probability of exploitation in next 30 days
EPSS Percentile
95.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.1205 is in the 96th percentile among its peer group of 19,958 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (33)

redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 6Fixed in: jbcs-httpd24-apr-0:1.6.3-63.jbcs.el6
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 6Fixed in: jbcs-httpd24-apr-util-0:1.6.1-48.jbcs.el6
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 6Fixed in: jbcs-httpd24-brotli-0:1.0.6-7.jbcs.el6
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 6Fixed in: jbcs-httpd24-curl-0:7.64.1-14.jbcs.el6
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 6Fixed in: jbcs-httpd24-httpd-0:2.4.37-33.jbcs.el6
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 6Fixed in: jbcs-httpd24-jansson-0:2.11-20.jbcs.el6
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 6Fixed in: jbcs-httpd24-mod_cluster-native-0:1.3.12-9.Final_redhat_2.jbcs.el6
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 6Fixed in: jbcs-httpd24-mod_jk-0:1.2.46-22.redhat_1.jbcs.el6
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 6Fixed in: jbcs-httpd24-mod_security-0:2.9.2-16.GA.jbcs.el6
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 6Fixed in: jbcs-httpd24-nghttp2-0:1.39.2-4.jbcs.el6
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 6Fixed in: jbcs-httpd24-openssl-1:1.1.1-25.jbcs.el6
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 7Fixed in: jbcs-httpd24-apr-0:1.6.3-63.jbcs.el7
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 7Fixed in: jbcs-httpd24-apr-util-0:1.6.1-48.jbcs.el7
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 7Fixed in: jbcs-httpd24-brotli-0:1.0.6-7.jbcs.el7
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 7Fixed in: jbcs-httpd24-curl-0:7.64.1-14.jbcs.el7
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 7Fixed in: jbcs-httpd24-httpd-0:2.4.37-33.jbcs.el7
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 7Fixed in: jbcs-httpd24-jansson-0:2.11-20.jbcs.el7
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 7Fixed in: jbcs-httpd24-mod_cluster-native-0:1.3.12-9.Final_redhat_2.jbcs.el7
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 7Fixed in: jbcs-httpd24-mod_jk-0:1.2.46-22.redhat_1.jbcs.el7
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 7Fixed in: jbcs-httpd24-mod_security-0:2.9.2-16.GA.jbcs.el7
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 7Fixed in: jbcs-httpd24-nghttp2-0:1.39.2-4.jbcs.el7
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 7Fixed in: jbcs-httpd24-openssl-1:1.1.1-25.jbcs.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: openssl-1:1.0.2k-16.el7
View patch
redhatpatch availablevia redhat_api
Product: Text-Only JBCSFixed in: openssl
View patch
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: openssl
redhatno patchvia redhat_api
Product: Red Hat JBoss Web Server 3Fixed in: openssl
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: openssl098e
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: openssl
redhatend of lifevia redhat_api
Product: Red Hat JBoss Enterprise Application Platform 5Fixed in: openssl
redhatend of lifevia redhat_api
Product: Red Hat JBoss Enterprise Application Platform 6Fixed in: openssl
redhatend of lifevia redhat_api
Product: Red Hat JBoss Enterprise Web Server 2Fixed in: openssl
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: openssl098e
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: openssl097a

Vendor Advisories (1)

redhatCVE-2018-0737Low

openssl: RSA key generation cache timing vulnerability in crypto/rsa/rsa_gen.c allows attackers to recover private keys

Apr 16, 2018

References

access.redhat.com / errata/RHSA-2018:3221
access.redhat.com / errata/RHSA-2018:3505
access.redhat.com / errata/RHSA-2019:3932
access.redhat.com / errata/RHSA-2019:3933
access.redhat.com / errata/RHSA-2019:3935
git.openssl.org / gitweb
git.openssl.org / gitweb
lists.debian.org / debian-lts-announce/2018/07/msg00043.html
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/EWC42UXL5GHTU5G77VKBF6JYUUNGSHOM
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/Y3IVFGSERAZLNJCK35TEM2R4726XIH3Z
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/ZBEV5QGDRFUZDMNECFXUSN5FMYOZDE4V
nodejs.org / en/blog/vulnerability/august-2018-security-releases
securityadvisories.paloaltonetworks.com / Home/Detail/133
security.gentoo.org / glsa/201811-21
security.netapp.com / advisory/ntap-20180726-0003
usn.ubuntu.com / 3628-1
Third Party Advisory
usn.ubuntu.com / 3628-2
Third Party Advisory
usn.ubuntu.com / 3692-1
usn.ubuntu.com / 3692-2
debian.org / security/2018/dsa-4348
debian.org / security/2018/dsa-4355
openssl.org / news/secadv/20180416.txt
Vendor Advisory
oracle.com / security-alerts/cpuapr2020.html
oracle.com / /security-alerts/cpujul2021.html
oracle.com / technetwork/security-advisory/cpuapr2019-5072813.html
oracle.com / technetwork/security-advisory/cpujan2019-5072801.html
oracle.com / technetwork/security-advisory/cpujul2019-5072835.html
tenable.com / security/tns-2018-12
tenable.com / security/tns-2018-13
tenable.com / security/tns-2018-14
tenable.com / security/tns-2018-17
oracle.com / technetwork/security-advisory/cpuoct2018-4428296.html
securityfocus.com / bid/103766
Third Party AdvisoryVDB Entry
securitytracker.com / id/1040685
Third Party AdvisoryVDB Entry