Client DoS due to large DH parameter
During key agreement in a TLS handshake using a DH(E) based ciphersuite a malicious server can send a very large prime value to the client. This will cause the client to spend an unreasonably long period of time generating a key for this prime resulting in a hang until the client has finished. This could be exploited in a Denial Of Service attack. Fixed in OpenSSL 1.1.0i-dev (Affected 1.1.0-1.1.0h). Fixed in OpenSSL 1.0.2p-dev (Affected 1.0.2-1.0.2o).
- BDU:2019-00186
- DLA-1449-1
- DSA-4348-1
- DSA-4355-1
- openSUSE-SU-2024:11126-1
- openSUSE-SU-2024:11501-1
- RHSA-2018:2552
- RHSA-2018:2553
- RHSA-2018:3221
- RHSA-2019:1297
- SUSE-SU-2018:1887-1
- SUSE-SU-2018:1887-2
- SUSE-SU-2018:1968-1
- SUSE-SU-2018:2036-1
- SUSE-SU-2018:2041-1
- SUSE-SU-2018:2207-1
- SUSE-SU-2018:2534-1
- SUSE-SU-2018:2545-1
- SUSE-SU-2018:2647-1
- SUSE-SU-2018:2683-1
- Published
- Jun 12, 2018
- Updated
- Jun 16, 2026
- EPSS
- 48.8% · 99th percentile
- CWE
- CWE-320
Sign in to follow · You’ll be notified if a followed record enters KEV, gets an exploit or is updated.
Report tools
Action score
45
Plan
Add it to your regular patch cycle.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 15 / 30 · 48.8%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| openssl | openssl | cpe:2.3:a:openssl:openssl |
| canonical | ubuntu linux | cpe:2.3:o:canonical:ubuntu_linux |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
| nodejs | node.js | cpe:2.3:a:nodejs:node.js |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- nodejs node.js6.0.0 and later · before 6.8.1
- nodejs node.js6.9.0 and later · before 6.14.4
- nodejs node.js8.0.0 and later · before 8.8.1
- nodejs node.js8.9.0 and later · before 8.11.4
- nodejs node.js10.0.0 and later · before 10.9.0
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 1.0.2-1.0.2o)affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Alpine:v3.10 | libressl | before 2.7.4-r0 | 2.7.4-r0 |
| Alpine:v3.3 | openssl | from 1.0.2 · before 1.0.2o-r1 | 1.0.2o-r1 |
| Alpine:v3.7 | libressl | before 2.6.5-r0 | 2.6.5-r0 |
| Debian:12 | openssl | before 1.1.1-1 | 1.1.1-1 |
| 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:Tumbleweed | openssl-1_0_0 | before 1.0.2u-6.2 | 1.0.2u-6.2 |
| openSUSE:Tumbleweed | virtualbox | before 6.1.26-3.2 | 6.1.26-3.2 |
| 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-httpd | before 0:2.4.29-40.jbcs.el6 | 0:2.4.29-40.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-httpd-debuginfo | before 0:2.4.29-40.jbcs.el6 | 0:2.4.29-40.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-httpd-devel | before 0:2.4.29-40.jbcs.el6 | 0:2.4.29-40.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-httpd-manual | before 0:2.4.29-40.jbcs.el6 | 0:2.4.29-40.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-httpd-selinux | before 0:2.4.29-40.jbcs.el6 | 0:2.4.29-40.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-httpd-tools | before 0:2.4.29-40.jbcs.el6 | 0:2.4.29-40.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-mod_ldap | before 0:2.4.29-40.jbcs.el6 | 0:2.4.29-40.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-mod_proxy_html | before 1:2.4.29-40.jbcs.el6 | 1:2.4.29-40.jbcs.el6 |
| Red Hat:jboss_core_services:1::el6 | jbcs-httpd24-mod_session | before 0:2.4.29-40.jbcs.el6 | 0:2.4.29-40.jbcs.el6 |
+46
Same product
openssl: all recordsOther highest-scoring records for the same primary product.
- CVE-2014-0160The (1) TLS and (2) DTLS implementations in OpenSSL 1.0.1 before 1.0.1g do not properly handle Heartbeat Extension packets, which allows remKEV90Now
- CVE-2021-3711SM2 Decryption Buffer Overflow65This week
- CVE-2003-0545Double free vulnerability in OpenSSL 0.9.7 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code 65This week
- 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:libressl | 2.7.4-r0 · Alpine:v3.10 | Package registry (OSV) |
| alpine:openssl | 1.0.2o-r1 · Alpine:v3.3 | Package registry (OSV) |
| debian:openssl | 1.1.1-1 · 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:virtualbox | 6.1.26-3.2 · openSUSE:Tumbleweed | Package registry (OSV) |
| red hat:jbcs-httpd24-httpd | 0:2.4.29-40.jbcs.el6 · Red Hat:jboss_core_services:1::el6 | Package registry (OSV) |
| red hat:jbcs-httpd24-httpd-debuginfo | 0:2.4.29-40.jbcs.el6 · Red Hat:jboss_core_services:1::el6 | Package registry (OSV) |
| red hat:npm | 1:5.6.0-1.8.11.4.2.el7 · Red Hat:openshift_application_runtimes:1.0::el7 | 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) |
| red hat:rhoar-nodejs | 1:8.11.4-2.el7 · Red Hat:openshift_application_runtimes:1.0::el7 | Package registry (OSV) |
| red hat:rhoar-nodejs-debuginfo | 1:8.11.4-2.el7 · Red Hat:openshift_application_runtimes:1.0::el7 | Package registry (OSV) |
| red hat:rhoar-nodejs-docs | 1:8.11.4-2.el7 · Red Hat:openshift_application_runtimes:1.0::el7 | Package registry (OSV) |
| suse:compat-openssl097g | 0.9.7g-146.22.51.5.1 · SUSE:Linux Enterprise Server for SAP Applications 11 SP4 | Package registry (OSV) |
| suse:compat-openssl098 | 0.9.8j-106.6.1 · SUSE:Linux Enterprise Desktop 12 SP3 | Package registry (OSV) |
| suse:nodejs4 | 4.9.1-15.14.1 · SUSE:Linux Enterprise Module for Web and Scripting 12 | Package registry (OSV) |
| suse:nodejs6 | 6.14.4-11.18.1 · SUSE:OpenStack Cloud 7 | Package registry (OSV) |
| suse:nodejs8 | 8.11.4-3.8.2 · SUSE:Linux Enterprise Module for Web and Scripting 15 | Package registry (OSV) |
| suse:openssl | 1.0.2j-60.30.1 · SUSE:OpenStack Cloud 7 | Package registry (OSV) |
| suse:openssl-1_0_0 | 1.0.2n-3.3.1 · SUSE:Linux Enterprise Module for Legacy 15 | Package registry (OSV) |
| suse:openssl-1_1 | 1.1.0h-4.3.1 · 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.
- Guido VrankenAisle Research
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
The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.
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.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-320 · Key Management ErrorsCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
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.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
- www.securityfocus.com/bid/104442
- www.securitytracker.com/id/1041090
- access.redhat.com/errata/RHSA-2018:2552
- access.redhat.com/errata/RHSA-2018:2553
- access.redhat.com/errata/RHSA-2018:3221
- access.redhat.com/errata/RHSA-2018:3505
- access.redhat.com/errata/RHSA-2019:1296
- access.redhat.com/errata/RHSA-2019:1297
- access.redhat.com/errata/RHSA-2019:1543
- cert-portal.siemens.com/productcert/pdf/ssa-419820.pdf
- git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=3984ef0b72831da8b3ece4745cac4f8575b19098
- git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=ea7abeeabf92b7aca160bdd0208636d4da69f4f4
- 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/201811-03
- security.netapp.com/advisory/ntap-20181105-0001/
Vendor advisories and official records. Exploit/PoC links are deliberately left out.