CVE-2020-27632

In SIMATIC MV400 family versions prior to v7.0.6, the ISN generator is initialized with a constant value and has constant increments. An attacker could predict and hijack TCP sessions.

CVSS v3 7.5 HIGH
CVSS v2.0 5.0 MEDIUM

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

5.0^/10

CVSS v2.0 : MEDIUM

Vector : AV:N/AC:L/Au:N/C:N/I:P/A:N

Exploitability : 10.0 / Impact : 2.9

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact NONE

References

Link	Resource
https://cert-portal.siemens.com/productcert/pdf/ssa-599268.pdf	Vendor Advisory
https://www.cisa.gov/news-events/ics-advisories/icsa-21-042-01
https://www.forescout.com/resources/numberjack-weak-isn-generation-in-embedded-tcpip-stacks/

Configurations

Configuration 1 (hide)

AND

cpe:2.3:h:siemens:simatic_mv420:-:*:*:*:*:*:*:*

cpe:2.3:o:siemens:simatic_mv420_firmware:*:*:*:*:*:*:*:*

Configuration 2 (hide)

AND

cpe:2.3:h:siemens:simatic_mv440:-:*:*:*:*:*:*:*

cpe:2.3:o:siemens:simatic_mv440_firmware:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2021-03-10 18:15

Updated : 2023-10-10 17:15

NVD link : CVE-2020-27632

Mitre link : CVE-2020-27632

CVE.ORG link : CVE-2020-27632

JSON object : View

Products Affected

siemens

simatic_mv440_firmware
simatic_mv440
simatic_mv420_firmware
simatic_mv420

CWE

NVD-CWE-noinfo

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