Skip to content
Fencer Vulns
medium 5.3

CVE-2023-3817 json

Excessive time spent checking DH q parameter value

published 2023-07-31 3 y ago modified 2026-10-14 25 d ago also EUVD-2023-44449 , GHSA-c945-cqj5-wfv6 , JLSEC-2026-241

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
3.0%
EPSS 3.0% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

Issue summary: Checking excessively long DH keys or parameters may be very slow.

Impact summary: Applications that use the functions DH_check(), DH_check_ex() or EVP_PKEY_param_check() to check a DH key or DH parameters may experience long delays. Where the key or parameters that are being checked have been obtained from an untrusted source this may lead to a Denial of Service.

The function DH_check() performs various checks on DH parameters. After fixing CVE-2023-3446 it was discovered that a large q parameter value can also trigger an overly long computation during some of these checks. A correct q value, if present, cannot be larger than the modulus p parameter, thus it is unnecessary to perform these checks if q is larger than p.

An application that calls DH_check() and supplies a key or parameters obtained from an untrusted source could be vulnerable to a Denial of Service attack.

The function DH_check() is itself called by a number of other OpenSSL functions. An application calling any of those other functions may similarly be affected. The other functions affected by this are DH_check_ex() and EVP_PKEY_param_check().

Also vulnerable are the OpenSSL dhparam and pkeyparam command line applications when using the "-check" option.

The OpenSSL SSL/TLS implementation is not affected by this issue.

The OpenSSL 3.0 and 3.1 FIPS providers are not affected by this issue.

Patch / fix

  • julia OpenSSL_jll 1.1.22+0, 3.0.10+0
  • julia Openresty_jll 1.27.1+0
  • OpenSSL OpenSSL 1.0.2zi, 1.1.1v, 3.0.10, 3.1.2
  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP V3.1.5
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP V3.1.5
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP V3.1.5
  • openssl Debian 12 3.0.10-1~deb12u1
  • openssl Debian 14, Debian 13 3.0.10-1

debian advisories DEBIAN-CVE-2023-3817

  • edk2 Ubuntu 22.04 LTS 2022.02-3ubuntu0.22.04.4
  • edk2 Ubuntu 24.04 LTS 2024.02-2ubuntu0.6
  • openssl Ubuntu 20.04 LTS 1.1.1f-1ubuntu2.20
  • openssl Ubuntu 22.04 LTS 3.0.2-0ubuntu1.12
  • openssl Ubuntu Pro 16.04 LTS 1.0.2g-1ubuntu4.20+esm10
  • openssl Ubuntu Pro FIPS-updates 16.04 LTS 1.0.2g-1ubuntu4.fips.4.20.10
  • openssl Ubuntu Pro 18.04 LTS 1.1.1-1ubuntu2.1~18.04.23+esm3
  • openssl Ubuntu Pro FIPS-updates 18.04 LTS 1.1.1-1ubuntu2.fips.2.1~18.04.23.3

ubuntu advisories UBUNTU-CVE-2023-3817

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • foreman satellite utils 6.13, satellite capsule 6.13, satellite 6.13 3.5.1.23-1.el8sat
  • foreman-cli satellite utils 6.13, satellite 6.13 3.5.1.23-1.el8sat
  • foreman-ec2 satellite 6.13 3.5.1.23-1.el8sat
  • rubygem-git satellite 6.13 1.18.0-1.el8sat
  • puppet-agent satellite capsule 6.13, satellite 6.13 7.26.0-3.el8sat
  • foreman-ovirt satellite 6.13 3.5.1.23-1.el8sat
  • python-django satellite capsule 6.13, satellite 6.13 3.2.21-1.el8pc
  • foreman-vmware satellite 6.13 3.5.1.23-1.el8sat

red hat advisories RHSA-2023:5931RHSA-2024:2447RHSA-2023:7877RHSA-2024:0208RHSA-2024:0154RHSA-2023:7625

  • openssl-3 SLE Module for Basesystem 15 SP5, openSUSE Leap 15.5 3.0.8-150500.5.14.1
  • openssl-3 SLE Module for Basesystem 15 SP4, SLE Micro 5.4, SLE Micro 5.3 +3 more 3.0.8-150400.4.37.1
  • openssl-1_1 SLE Micro 5.2, SLE Micro 5.1, SLE High Performance Computing 15 SP3-ESPOS +9 more 1.1.1d-150200.11.75.1
  • openssl-3 SLE Module for Basesystem 15 SP4, SLE Micro 5.4, SLE Micro 5.3 +3 more 3.0.8-150400.4.34.1
  • openssl-1_1 SLE Module for Basesystem 15 SP4, SLE Micro 5.4, SLE Micro 5.3 +3 more 1.1.1l-150400.7.53.1
  • openssl-1_0_0 SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 1.0.2p-3.84.1
  • openssl-1_0_0 SLE Module for Legacy 15 SP5, SLE Module for Legacy 15 SP4, openSUSE Leap 15.5 +1 more 1.0.2p-150000.3.85.1
  • openssl SLES 12 SP2-BCL 1.0.2j-60.104.1

suse advisories SUSE-SU-2023:4190-1SUSE-SU-2023:4189-1SUSE-SU-2023:3291-2SUSE-SU-2023:3958-1SUSE-SU-2023:3244-2SUSE-SU-2023:3397-1

  • openssl-1_1 openSUSE Tumbleweed 1.1.1v-1.1
  • openssl-3 openSUSE Tumbleweed 3.1.2-1.1
  • openssl-1_0_0 openSUSE Tumbleweed 1.0.2u-22.1

opensuse advisories openSUSE-SU-2024:13090-1openSUSE-SU-2024:13097-1openSUSE-SU-2024:13111-1

  • openssl AlmaLinux 9 1:3.0.7-27.el9
  • openssl-libs AlmaLinux 9 1:3.0.7-27.el9
  • openssl-perl AlmaLinux 9 1:3.0.7-27.el9
  • openssl AlmaLinux 8 1:1.1.1k-12.el8_9
  • openssl-libs AlmaLinux 8 1:1.1.1k-12.el8_9
  • openssl-perl AlmaLinux 8 1:1.1.1k-12.el8_9

almalinux advisories ALSA-2024:2447ALSA-2023:7877

  • openssl Rocky Linux 8 1:1.1.1k-12.el8_9

rocky linux advisories RLSA-2023:7877

  • openssl Alpine 3.16, Alpine 3.15 1.1.1v-r0
  • openssl Alpine 3.17 3.0.10-r0
  • openssl Alpine 3.24, Alpine 3.23, Alpine 3.22 +4 more 3.1.2-r0
  • openssl3 Alpine 3.16, Alpine 3.15 3.0.11-r0

alpine advisories ALPINE-CVE-2023-3817

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • openssl CBL-Mariner 2.0 1.1.1k-26
  • rust CBL-Mariner 2.0, Azure Linux 3.0 1.68.2-5
  • edk2 CBL-Mariner 2.0, Azure Linux 3.0 20230301gitf80f052277c8-37
  • hvloader CBL-Mariner 2.0 1.0.1-9

azure linux advisories AZL-27815AZL-27817AZL-31139AZL-34669AZL-35247AZL-37764

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-3817 updated cvss 5.3

OpenSSL: Excessive time spent checking DH q parameter value

  • Red Hat Enterprise Linux 6 openssl, openssl-perl Red Hat Enterprise Linux 7 openssl, openssl-libs, openssl-perl
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 mingw-openssl, mingw32-openssl, mingw64-openssl, compat-openssl10 Red Hat Enterprise Linux 9 compat-openssl11
    affected: workaround, no fix available “Fix deferred”
  • Red Hat JBoss Core Services jbcs-httpd24-openssl-chil jbcs-httpd24-openssl-chil, jbcs-httpd24-openssl-pkcs11 jbcs-httpd24-openssl-pkcs11
    affected: workaround, no fix available
  • Red Hat Enterprise Linux AppStream (v. 9) openssl-perl 3.0.7-27.el9
    fixed: vendor fix RHSA-2024:2447
  • Red Hat Enterprise Linux BaseOS (v. 8) openssl 1.1.1k-12.el8_9, openssl-libs 1.1.1k-12.el8_9, openssl-perl 1.1.1k-12.el8_9
    fixed: vendor fix RHSA-2023:7877
  • Red Hat Enterprise Linux BaseOS (v. 9) openssl 3.0.7-27.el9, openssl-libs 3.0.7-27.el9
    fixed: vendor fix RHSA-2024:2447
  • Red Hat Enterprise Linux BaseOS EUS (v.8.6) openssl 1.1.1k-12.el8_6, openssl-libs 1.1.1k-12.el8_6, openssl-perl 1.1.1k-12.el8_6
    fixed: vendor fix RHSA-2024:0208
  • Red Hat Enterprise Linux BaseOS EUS (v.8.8) openssl 1.1.1k-12.el8_8, openssl-libs 1.1.1k-12.el8_8, openssl-perl 1.1.1k-12.el8_8
    fixed: vendor fix RHSA-2024:0154
show 6 more
  • Red Hat JBoss Core Services
    fixed: vendor fix RHSA-2023:7626
  • Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-openssl 1.1.1k-16.el7jbcs, jbcs-httpd24-openssl-libs 1.1.1k-16.el7jbcs, jbcs-httpd24-openssl-perl 1.1.1k-16.el7jbcs Red Hat JBoss Core Services on RHEL 8 jbcs-httpd24-openssl 1.1.1k-16.el8jbcs, jbcs-httpd24-openssl-libs 1.1.1k-16.el8jbcs, jbcs-httpd24-openssl-perl 1.1.1k-16.el8jbcs
    fixed: vendor fix RHSA-2023:7625
  • Red Hat JBoss Web Server 5
    fixed: vendor fix RHSA-2023:7623
  • Red Hat JBoss Web Server 5.7 for RHEL 7 Server jws5-tomcat-native 1.2.31-16.redhat_16.el7jws Red Hat JBoss Web Server 5.7 for RHEL 8 jws5-tomcat-native 1.2.31-16.redhat_16.el8jws Red Hat JBoss Web Server 5.7 for RHEL 9 jws5-tomcat-native 1.2.31-16.redhat_16.el9jws
    fixed: vendor fix RHSA-2023:7622
  • Red Hat Satellite 6.13 for RHEL 8 puppet-agent 7.26.0-3.el8sat
    fixed: vendor fix RHSA-2023:5931
  • Red Hat Cryostat 2 openssl Red Hat Enterprise Linux 8 openssl-pkcs11, openssl-ibmpkcs11 Red Hat Enterprise Linux 9 openssl-ibmca, openssl-pkcs11 Red Hat Enterprise Linux BaseOS (v. 9) openssl-fips-provider 3.0.7-2.el9 Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-curl 8.4.0-2.el7jbcs, jbcs-httpd24-httpd 2.4.57-7.el7jbcs, jbcs-httpd24-libcurl 8.4.0-2.el7jbcs, jbcs-httpd24-mod_md 2.4.24-2.el7jbcs, jbcs-httpd24-mod_ssl 2.4.57-7.el7jbcs, jbcs-httpd24-mod_ldap 2.4.57-7.el7jbcs, +20 more Red Hat JBoss Core Services on RHEL 8 jbcs-httpd24-curl 8.4.0-2.el8jbcs, jbcs-httpd24-httpd 2.4.57-7.el8jbcs, jbcs-httpd24-libcurl 8.4.0-2.el8jbcs, jbcs-httpd24-mod_md 2.4.24-2.el8jbcs, jbcs-httpd24-mod_ssl 2.4.57-7.el8jbcs, jbcs-httpd24-mod_ldap 2.4.57-7.el8jbcs, +20 more
    +4 more products
    Red Hat JBoss Web Server 5.7 for RHEL 7 Server jws5-tomcat 9.0.62-19.redhat_00017.1.el7jws, jws5-tomcat-lib 9.0.62-19.redhat_00017.1.el7jws, jws5-tomcat-javadoc 9.0.62-19.redhat_00017.1.el7jws, jws5-tomcat-selinux 9.0.62-19.redhat_00017.1.el7jws, jws5-tomcat-webapps 9.0.62-19.redhat_00017.1.el7jws, jws5-tomcat-java-jdk8 9.0.62-19.redhat_00017.1.el7jws, +6 more Red Hat JBoss Web Server 5.7 for RHEL 8 jws5-tomcat 9.0.62-19.redhat_00017.1.el8jws, jws5-tomcat-lib 9.0.62-19.redhat_00017.1.el8jws, jws5-tomcat-javadoc 9.0.62-19.redhat_00017.1.el8jws, jws5-tomcat-selinux 9.0.62-19.redhat_00017.1.el8jws, jws5-tomcat-webapps 9.0.62-19.redhat_00017.1.el8jws, jws5-tomcat-el-3.0-api 9.0.62-19.redhat_00017.1.el8jws, +4 more Red Hat JBoss Web Server 5.7 for RHEL 9 jws5-tomcat 9.0.62-19.redhat_00017.1.el9jws, jws5-tomcat-lib 9.0.62-19.redhat_00017.1.el9jws, jws5-tomcat-javadoc 9.0.62-19.redhat_00017.1.el9jws, jws5-tomcat-selinux 9.0.62-19.redhat_00017.1.el9jws, jws5-tomcat-webapps 9.0.62-19.redhat_00017.1.el9jws, jws5-tomcat-el-3.0-api 9.0.62-19.redhat_00017.1.el9jws, +4 more Red Hat Satellite 6.13 for RHEL 8 foreman 3.5.1.23-1.el8sat, satellite 6.13.5-1.el8sat, rubygem-git 1.18.0-1.el8sat, python-django 3.2.21-1.el8pc, foreman-cli 3.5.1.23-1.el8sat, foreman-ec2 3.5.1.23-1.el8sat, +25 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-23-348-10 updated cvss 5.3

Siemens SIMATIC S7-1500

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= 3.1.0, < 3.1.5 Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= 3.1.0, < 3.1.5
    affected: fixed in V3.1.5, mitigation support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

3.05% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
OSV 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected packages

ecosystem package affected fixed in
julia OpenSSL_jll
<1.1.22+0
>=3.0.8+0, <3.0.10+0
1.1.22+0
3.0.10+0
julia Openresty_jll
<1.27.1+0
1.27.1+0

Affected products

  • OpenSSL OpenSSL
  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

Classification

Weakness
  • CWE-606 Unchecked Input for Loop Condition
  • CWE-834 Excessive Iteration
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.