CVE-2020-27632

HIGH

7.5

Description

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.

CVE Details

CVSS v3.1 Score7.5

SeverityHIGH

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published3/10/2021

Last Modified11/21/2024

Sourcenvd

Honeypot Sightings0

Affected Products

siemens:simatic_mv420siemens:simatic_mv420_firmwaresiemens:simatic_mv440siemens:simatic_mv440_firmware

References

https://cert-portal.siemens.com/productcert/pdf/ssa-599268.pdf(cve@mitre.org)

https://www.cisa.gov/news-events/ics-advisories/icsa-21-042-01(cve@mitre.org)

https://www.forescout.com/resources/numberjack-weak-isn-generation-in-embedded-tcpip-stacks/(cve@mitre.org)

https://cert-portal.siemens.com/productcert/pdf/ssa-599268.pdf(af854a3a-2127-422b-91ae-364da2661108)

https://www.cisa.gov/news-events/ics-advisories/icsa-21-042-01(af854a3a-2127-422b-91ae-364da2661108)

https://www.forescout.com/resources/numberjack-weak-isn-generation-in-embedded-tcpip-stacks/(af854a3a-2127-422b-91ae-364da2661108)

IOC Correlations

No correlations recorded

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