Cache timing vulnerability in RSA Key Generation
The OpenSSL RSA Key generation algorithm has been shown to be vulnerable to a cache timing side channel attack. An attacker with sufficient access to mount cache timing attacks during the RSA key generation process could recover the private key. Fixed in OpenSSL 1.1.0i-dev (Affected 1.1.0-1.1.0h). Fixed in OpenSSL 1.0.2p-dev (Affected 1.0.2b-1.0.2o).
- BDU:2019-00021
- DLA-1449-1
- DSA-4348-1
- DSA-4355-1
- openSUSE-SU-2019:0152-1
- openSUSE-SU-2024:11126-1
- RHSA-2018:3221
- RHSA-2019:3932
- RHSA-2019:3933
- SUSE-SU-2018:2486-1
- SUSE-SU-2018:2492-1
- SUSE-SU-2018:2545-1
- SUSE-SU-2018:2683-1
- SUSE-SU-2018:2928-1
- SUSE-SU-2018:2928-2
- SUSE-SU-2018:2965-1
- SUSE-SU-2018:3864-1
- SUSE-SU-2018:3864-2
- SUSE-SU-2019:0197-1
- SUSE-SU-2019:1553-1
- Published
- Apr 16, 2018
- Updated
- Jun 16, 2026
- EPSS
- 11.6% · 96th percentile
- CWE
- CWE-327
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Report tools
Action score
26
Monitor
Low priority for now.
- CVSS
- 23 / 40 · 5.9 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 3 / 30 · 11.6%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| openssl | openssl | cpe:2.3:a:openssl:openssl |
| canonical | ubuntu linux | cpe:2.3:o:canonical:ubuntu_linux |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- canonical ubuntu linux14.04
- canonical ubuntu linux16.04
- canonical ubuntu linux17.10
- openssl openssl1.0.2b and later · up to 1.0.2o inclusive
- openssl openssl1.1.0 and later · up to 1.1.0h inclusive
Versions reported by the vendor
Affected version ranges reported by the assigning authority (openssl). Independent of NVD's CPE analysis and usually ahead of it.
OpenSSL OpenSSL
- Fixed in OpenSSL 1.1.0i-dev (Affected 1.1.0-1.1.0h), Fixed in OpenSSL 1.0.2p-dev (Affected 1.0.2b-1.0.2o)affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Alpine:v3.3 | openssl | from 1.0.2b · before 1.0.2o-r1 | 1.0.2o-r1 |
| Alpine:v3.4 | openssl | from 1.0.2b · before 1.0.2o-r2 | 1.0.2o-r2 |
| Debian:12 | openssl | before 1.1.0h-3 | 1.1.0h-3 |
| Debian:8 | openssl | before 1.0.1t-1+deb8u9 | 1.0.1t-1+deb8u9 |
| Debian:9 | openssl | before 1.1.0j-1~deb9u1 | 1.1.0j-1~deb9u1 |
| Debian:9 | openssl1.0 | before 1.0.2q-1~deb9u1 | 1.0.2q-1~deb9u1 |
| openSUSE:Leap 15.0 | openssl-1_1 | before 1.1.0i-lp150.3.18.1 | 1.1.0i-lp150.3.18.1 |
| openSUSE:Tumbleweed | openssl-1_0_0 | before 1.0.2u-6.2 | 1.0.2u-6.2 |
| Red Hat:enterprise_linux:7::client | openssl | before 1:1.0.2k-16.el7 | 1:1.0.2k-16.el7 |
| Red Hat:enterprise_linux:7::client | openssl-debuginfo | before 1:1.0.2k-16.el7 | 1:1.0.2k-16.el7 |
| Red Hat:enterprise_linux:7::client | openssl-devel | before 1:1.0.2k-16.el7 | 1:1.0.2k-16.el7 |
| Red Hat:enterprise_linux:7::client | openssl-libs | before 1:1.0.2k-16.el7 | 1:1.0.2k-16.el7 |
| Red Hat:enterprise_linux:7::client | openssl-perl | before 1:1.0.2k-16.el7 | 1:1.0.2k-16.el7 |
| Red Hat:enterprise_linux:7::client | openssl-static | before 1:1.0.2k-16.el7 | 1:1.0.2k-16.el7 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-apr | before 0:1.6.3-63.jbcs.el6 | 0:1.6.3-63.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-apr-debuginfo | before 0:1.6.3-63.jbcs.el6 | 0:1.6.3-63.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-apr-devel | before 0:1.6.3-63.jbcs.el6 | 0:1.6.3-63.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-apr-util | before 0:1.6.1-48.jbcs.el6 | 0:1.6.1-48.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-apr-util-debuginfo | before 0:1.6.1-48.jbcs.el6 | 0:1.6.1-48.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-apr-util-devel | before 0:1.6.1-48.jbcs.el6 | 0:1.6.1-48.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-apr-util-ldap | before 0:1.6.1-48.jbcs.el6 | 0:1.6.1-48.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-apr-util-mysql | before 0:1.6.1-48.jbcs.el6 | 0:1.6.1-48.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-apr-util-nss | before 0:1.6.1-48.jbcs.el6 | 0:1.6.1-48.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-apr-util-odbc | before 0:1.6.1-48.jbcs.el6 | 0:1.6.1-48.jbcs.el6 |
+96
Same product
openssl: all recordsOther highest-scoring records for the same primary product.
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- CVE-2016-2108The ASN.1 implementation in OpenSSL before 1.0.1o and 1.0.2 before 1.0.2c allows remote attackers to execute arbitrary code or cause a denia62This week
- CVE-2016-6309statem/statem.c in OpenSSL 1.1.0a does not consider memory-block movement after a realloc call, which allows remote attackers to cause a den60This week
- CVE-2022-3786X.509 Email Address Variable Length Buffer Overflow58Plan
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| alpine:openssl | 1.0.2o-r1 · Alpine:v3.3 | Package registry (OSV) |
| debian:openssl | 1.1.0h-3 · Debian:12 | Package registry (OSV) |
| debian:openssl1.0 | 1.0.2q-1~deb9u1 · Debian:9 | Package registry (OSV) |
| opensuse:openssl-1_0_0 | 1.0.2u-6.2 · openSUSE:Tumbleweed | Package registry (OSV) |
| opensuse:openssl-1_1 | 1.1.0i-lp150.3.18.1 · openSUSE:Leap 15.0 | Package registry (OSV) |
| red hat:jbcs-httpd24-apr | 0:1.6.3-63.jbcs.el6 · Red Hat:jboss_core_services:1::el6 | Package registry (OSV) |
| red hat:jbcs-httpd24-apr-debuginfo | 0:1.6.3-63.jbcs.el6 · Red Hat:jboss_core_services:1::el6 | Package registry (OSV) |
| red hat:jbcs-httpd24-apr-devel | 0:1.6.3-63.jbcs.el6 · Red Hat:jboss_core_services:1::el6 | Package registry (OSV) |
| red hat:jbcs-httpd24-apr-util | 0:1.6.1-48.jbcs.el6 · Red Hat:jboss_core_services:1::el6 | Package registry (OSV) |
| red hat:jbcs-httpd24-apr-util-debuginfo | 0:1.6.1-48.jbcs.el6 · Red Hat:jboss_core_services:1::el6 | Package registry (OSV) |
| red hat:jbcs-httpd24-apr-util-devel | 0:1.6.1-48.jbcs.el6 · Red Hat:jboss_core_services:1::el6 | Package registry (OSV) |
| red hat:openssl | 1:1.0.2k-16.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:openssl-debuginfo | 1:1.0.2k-16.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:openssl-devel | 1:1.0.2k-16.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:openssl-libs | 1:1.0.2k-16.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:openssl-perl | 1:1.0.2k-16.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:openssl-static | 1:1.0.2k-16.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| suse:compat-openssl098 | 0.9.8j-106.6.1 · SUSE:Linux Enterprise Desktop 12 SP3 | Package registry (OSV) |
| suse:openssl | 0.9.8j-0.106.15.1 · SUSE:Linux Enterprise Software Development Kit 11 SP4 | Package registry (OSV) |
| suse:openssl-1_0_0 | 1.0.2p-3.8.1 · SUSE:Linux Enterprise Module for Legacy 15 | Package registry (OSV) |
| suse:openssl-1_1 | 1.1.0i-4.18.1 · SUSE:Linux Enterprise Module for Basesystem 15 | Package registry (OSV) |
| suse:openssl1 | 1.0.1g-0.58.12.1 · SUSE:Linux Enterprise Server 11-SECURITY | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- Special conditions such as timing or configuration are required.
If successful
- Confidentiality
- high · data can be read
- Integrity
- none
- Availability
- none
- Attack vector
- Network
- Attack complexity
- High
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- None
- Availability impact
- None
Weakness class (CWE)
CWE-327 · Use of a Broken or Risky Cryptographic AlgorithmCVSS vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Encryption Brute ForcingCAPEC-20likelihood: Low · Low
- Creating a Rogue Certification Authority CertificateCAPEC-459likelihood: Medium · Very High
- Signature SpoofCAPEC-473
- Signature Spoofing by Improper ValidationCAPEC-475likelihood: Low · High
- Cryptanalysis of Cellular EncryptionCAPEC-608High
- Rooting SIM CardsCAPEC-614High
- CryptanalysisCAPEC-97likelihood: Low · Very High
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- www.debian.org/security/2018/dsa-4355
- usn.ubuntu.com/3692-1/
- usn.ubuntu.com/3692-2/
- www.debian.org/security/2018/dsa-4348
- www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
- www.securityfocus.com/bid/103766
- www.securitytracker.com/id/1040685
- 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/?p=openssl.git%3Ba=commitdiff%3Bh=349a41da1ad88ad87825414752a8ff5fdd6a6c3f
- git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=6939eab03a6e23d2bd2c3f5e34fe1d48e542e787
- 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/
- security.gentoo.org/glsa/201811-21
Vendor advisories and official records. Exploit/PoC links are deliberately left out.