Is CVE-2020-27632 in the CISA KEV catalog?

No. CVE-2020-27632 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-27632?

CVE-2020-27632 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2020-27632?

CVE-2020-27632 has an EPSS score of 1.21% (65th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-27632?

Upgrade simatic mv420 firmware to 7.0.6 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2020-27632

HIGH

7.5

CVSS v3

NVD

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.

How to fix

Remediation Available

simatic mv420 firmwareNVD

Affected:< 7.0.6Fixed in:7.0.6CVE-2020-27632derived from NVD

simatic mv440 firmwareNVD

Affected:< 7.0.6Fixed in:7.0.6CVE-2020-27632derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

1.21%probability of exploitation in 30 days

65thpercentile

Moderate risk: more likely to be exploited than 65% of all known CVEs.

References

Vendor Advisory1

cert-portal.siemens.com

Other references2

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.