CVE-2020-27738

Common vulnerabilities & exposures (CVE)

CVE database CVE database blogpost Release & EoL database

Published at: - 22-04-2021 11:15

Last modified: - 22-04-2022 09:44

Total changes: - 5

Description

A vulnerability has been identified in Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2017.02.3), Nucleus ReadyStart V4 (All versions < V4.1.0), Nucleus Source Code (Versions including affected DNS modules), SIMOTICS CONNECT 400 (All versions < V0.5.0.0). The DNS domain name record decompression functionality does not properly validate the pointer offset values. The parsing of malformed responses could result in a read access past the end of an allocated structure. An attacker with a privileged position in the network could leverage this vulnerability to cause a denial-of-service condition.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H

High

Attack complexity

Network

Attack vector

High

Availability

High

Confidentiality

None

Integrity

None

Privileges required

Unchanged

Scope

None

User interaction

7.4

Base score

2.2

5.2

Exploitability score

Impact score

Verification logic

AND

vendor=siemens AND product=simotics_connect_400_firmware AND versionEndExcluding=0.5.0.0

vendor=siemens AND product=simotics_connect_400 AND version=-

vendor=siemens AND product=nucleus_net

vendor=siemens AND product=nucleus_readystart_v3 AND versionEndExcluding=2017.02.3

vendor=siemens AND product=nucleus_readystart_v4 AND versionEndExcluding=4.1.0

vendor=siemens AND product=nucleus_source_code AND version=-

Reference

Keywords

CVE-2020-27738

Common vulnerabilities & exposures (CVE)

Description

Common Vulnerability Scoring System (CVSS)

Verification logic

Reference

NVD

CVE-2020-27738

CVE

Common vulnerabilities & exposures

CVSS

Common vulnerability scoring system

Security

Vulnerabilities

Exposures