CVE-2023-0464: openssl from 1.0.2 (inclusive), before 1.0.2zh (exclusive), from 1.1.1 (inclusive), before 1.1.1u (exclusive), from…

Affected technology

openssl · from 1.0.2 (inclusive), before 1.0.2zh (exclusive)
openssl

openssl · from 1.1.1 (inclusive), before 1.1.1u (exclusive)
openssl

openssl · from 3.0.0 (inclusive), before 3.0.9 (exclusive)
openssl

openssl · from 3.1.0 (inclusive), before 3.1.1 (exclusive)
openssl

OpenSSL · 3.1.0 to before 3.1.1, 3.0.0 to before 3.0.9, 1.1.1 to before 1.1.1u, 1.0.2 to before 1.0.2zh
OpenSSL

BFCClient · 0 to before V2.17
Siemens

SIMATIC S7-1500 CPU 1518-4 PN/DP MFP · V3.1.0 to before V3.1.5
Siemens

SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP · V3.1.0 to before V3.1.5
Siemens

SIMATIC S7-1500 TM MFP - GNU/Linux subsystem · 0 to before V1.1
Siemens

SIPLUS S7-1500 CPU 1518-4 PN/DP MFP · V3.1.0 to before V3.1.5
Siemens

Description’s affected range: versions of OpenSSL related to the verification of X.509 certificate chains that include policy constraints

Component: Not specified by the source

Attack conditions (NVD, CVSS 3.1): Network (remote) · No privileges required · No user interaction required

Attack conditions (Source advisory, CVSS 3.1): Network (remote) · No privileges required · No user interaction required

What an attacker can do

Attackers may be able to exploit this vulnerability by creating a malicious certificate chain that triggers exponential use of computational resources, leading to a denial-of-service (DoS) attack on affected systems. NVD’s CVSS 3.1 assessment (base score 7.5/10) rates confidentiality and integrity impact as none; availability impact as high. Source advisory’s CVSS 3.1 assessment (base score 7.5/10) rates confidentiality and integrity impact as none; availability impact as high.