CVE-2021-20740

Name: CVE-2021-20740
Creator: NVD / NIST
Published: 2021-06-28T01:15:07.44+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 3.11%

Last modified Jun 17, 2026

CVE-2021-20740 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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.. EPSS estimates a 3.11% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

3.11%

86.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-78

Affected Software

Vendor	Product	Versions
Hitachi	Virtual File Platform	< 6.4.3-09
Hitachi	Virtual File Platform	< 5.5.3-09
Nec	Nas Gateway Nh4a Firmware	< fos_5.5.3-08\(nec2.5.4a\)
Nec	Nas Gateway Nh8a Firmware	< fos_5.5.3-08\(nec2.5.4a\)
Nec	Nas Gateway Nh4b Firmware	< fos_6.4.3-08\(nec3.4.2\)
Nec	Nas Gateway Nh8b Firmware	< fos_6.4.3-08\(nec3.4.2\)
Nec	Nas Gateway Nh4c Firmware	< fos_6.4.3-08\(nec3.4.2\)
Nec	Nas Gateway Nh8c Firmware	< fos_6.4.3-08\(nec3.4.2\)

References

https://jpn.nec.com/security-info/secinfo/nv21-011.htmlVendor Advisory
https://jvn.jp/en/jp/JVN21298724/index.htmlThird Party Advisory
https://www.hitachi.co.jp/products/it/storage-solutions/global/sec_info/2021/2021_306.htmlVendor Advisory
https://jpn.nec.com/security-info/secinfo/nv21-011.htmlVendor Advisory
https://jvn.jp/en/jp/JVN21298724/index.htmlThird Party Advisory
https://www.hitachi.co.jp/products/it/storage-solutions/global/sec_info/2021/2021_306.htmlVendor Advisory

Timeline

Published: Jun 28, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20740?

How severe is CVE-2021-20740?

CVE-2021-20740 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 3.11% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20740?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-20740?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST