Is CVE-2021-20740 in the CISA KEV catalog?

No. CVE-2021-20740 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-20740?

CVE-2021-20740 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2021-20740?

CVE-2021-20740 has an EPSS score of 3.11% (86th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-20740?

Upgrade nas gateway nh4a firmware to fos_5.5.3-08(nec2.5.4a) or later. Fixes are available for 7 affected products.

CVE & CISA-KEV Catalog

CVE-2021-20740

HIGHEPSS 86th pctl

8.8

CVSS v3

NVD

Description

Hitachi Virtual File Platform Versions prior to 5.5.3-09 and Versions prior to 6.4.3-09, and NEC Storage M Series NAS Gateway Nh4a/Nh8a versions prior to FOS 5.5.3-08(NEC2.5.4a) and Nh4b/Nh8b, Nh4c/Nh8c versions prior to FOS 6.4.3-08(NEC3.4.2) allow remote authenticated attackers to execute arbitrary OS commands with root privileges via unspecified vectors.

CWE-78OS Command Injection

How to fix

Remediation Available

nas gateway nh4a firmwareNVD

Affected:< fos_5.5.3-08(nec2.5.4a)Fixed in:fos_5.5.3-08(nec2.5.4a)CVE-2021-20740derived from NVD

nas gateway nh4b firmwareNVD

Affected:< fos_6.4.3-08(nec3.4.2)Fixed in:fos_6.4.3-08(nec3.4.2)CVE-2021-20740derived from NVD

nas gateway nh4c firmwareNVD

Affected:< fos_6.4.3-08(nec3.4.2)Fixed in:fos_6.4.3-08(nec3.4.2)CVE-2021-20740derived from NVD

nas gateway nh8a firmwareNVD

Affected:< fos_5.5.3-08(nec2.5.4a)Fixed in:fos_5.5.3-08(nec2.5.4a)CVE-2021-20740derived from NVD

nas gateway nh8b firmwareNVD

Affected:< fos_6.4.3-08(nec3.4.2)Fixed in:fos_6.4.3-08(nec3.4.2)CVE-2021-20740derived from NVD

nas gateway nh8c firmwareNVD

Affected:< fos_6.4.3-08(nec3.4.2)Fixed in:fos_6.4.3-08(nec3.4.2)CVE-2021-20740derived from NVD

virtual file platformNVD

Affected:< 5.5.3-09Fixed in:5.5.3-09CVE-2021-20740derived 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 RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

3.11%probability of exploitation in 30 days

86thpercentile

Elevated risk: more likely to be exploited than 86% of all known CVEs.

References

Vendor Advisory2

Third-Party Advisory1

jvn.jp

Related Vulnerabilities

Other CWE-78 (OS Command Injection) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2021-1498	Critical	9.8	100%	KEV	Fix
CVE-2014-6271	Critical	9.8	100%	KEV	Fix
CVE-2019-16920	Critical	9.8	100%	KEV	-
CVE-2022-44877	Critical	9.8	100%	KEV	Fix
CVE-2020-8515	Critical	9.8	100%	KEV	-
CVE-2020-9054	Critical	9.8	100%	KEV	Fix

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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.