Is CVE-2020-27738 in the CISA KEV catalog?

No. CVE-2020-27738 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-27738?

CVE-2020-27738 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2020-27738?

CVE-2020-27738 has an EPSS score of 3.66% (88th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-27738?

Upgrade nucleus readystart v3 to 2017.02.3 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2020-27738

MEDIUMEPSS 88th pctl

6.5

CVSS v3

NVD

Description

A vulnerability has been identified in APOGEE PXC Compact (BACnet) (All versions < V3.5.5), APOGEE PXC Compact (P2 Ethernet) (All versions < V2.8.20), APOGEE PXC Modular (BACnet) (All versions < V3.5.5), APOGEE PXC Modular (P2 Ethernet) (All versions < V2.8.20), 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), TALON TC Compact (BACnet) (All versions < V3.5.5), TALON TC Modular (BACnet) (All versions < V3.5.5). 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.

CWE-788 CWE-119Buffer Overflow

How to fix

Remediation Available

nucleus readystart v3NVD

Affected:< 2017.02.3Fixed in:2017.02.3CVE-2020-27738derived from NVD

nucleus readystart v4NVD

Affected:< 4.1.0Fixed in:4.1.0CVE-2020-27738derived from NVD

simotics connect 400 firmwareNVD

Affected:< 0.5.0.0Fixed in:0.5.0.0CVE-2020-27738derived 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 ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

3.66%probability of exploitation in 30 days

88thpercentile

Elevated risk: more likely to be exploited than 88% of all known CVEs.

References

Patch2

Other references1

cert-portal.siemens.com

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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.