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CVE-2021-20740

HIGH
8.8
CVSS Score
Published: June 28, 2021 at 12:50 AM UTC
Updated: June 17, 2026 at 03:34 AM UTC
15 products affected across 3 vendorsNAS Gateway NH8A FirmwareNAS Gateway NH4B FirmwareNAS Gateway NH8B Firmware

Using Hitachi Virtual File Platform and NEC Storage M Series NAS Gateway which uses Hitachi Virtual File Platform by Hitachi and NEC Corporation?

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Severity
HIGH8.8
Exploit prediction
EPSS 3%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Virtual File Platform· Hitachi
95%
v < 5.5.3-09v < 6.4.3-09
Affected range stops below 5.5.3-09, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.4.3-09, so it looks safe — our inference, not a vendor statement
NAS Gateway NH4A Firmware· NEC
95%
v < fos_5.5.3-08(nec2.5.4a)
Affected range stops below fos_5.5.3-08(nec2.5.4a), so it looks safe — our inference, not a vendor statement
nec-nas-gateway-nh4a (same device)
NAS Gateway NH4B Firmware· NEC
95%
v < fos_6.4.3-08(nec3.4.2)
Affected range stops below fos_6.4.3-08(nec3.4.2), so it looks safe — our inference, not a vendor statement
nec-nas-gateway-nh4b (same device)
NAS Gateway NH4C Firmware· NEC
95%
v < fos_6.4.3-08(nec3.4.2)
Affected range stops below fos_6.4.3-08(nec3.4.2), so it looks safe — our inference, not a vendor statement
nec-nas-gateway-nh4c (same device)
NAS Gateway NH8A Firmware· NEC
95%
v < fos_5.5.3-08(nec2.5.4a)
Affected range stops below fos_5.5.3-08(nec2.5.4a), so it looks safe — our inference, not a vendor statement
nec-nas-gateway-nh8a (same device)
NAS Gateway NH8B Firmware· NEC
95%
v < fos_6.4.3-08(nec3.4.2)
Affected range stops below fos_6.4.3-08(nec3.4.2), so it looks safe — our inference, not a vendor statement
nec-nas-gateway-nh8b (same device)
NAS Gateway NH8C Firmware· NEC
95%
v < fos_6.4.3-08(nec3.4.2)
Affected range stops below fos_6.4.3-08(nec3.4.2), so it looks safe — our inference, not a vendor statement
nec-nas-gateway-nh8c (same device)
NEC Storage M Series NAS Gateway· Hitachi and NEC
60%
v < 5.5.3-9
Affected range stops below 5.5.3-9, so it looks safe — our inference, not a vendor statement
Virtual File Platform· Hitachi and NEC
60%
v < 5.5.3-9
Affected range stops below 5.5.3-9, so it looks safe — our inference, not a vendor statement
Nas Gateway Nh4A· NECdevice
80%
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_MISCVendor Advisory
Source: [email protected]
https://jpn.nec.com/security-info/secinfo/nv21-011.html
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://jvn.jp/en/jp/JVN21298724/index.html
x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.hitachi.co.jp/products/it/storage-solutions/global/sec_info/2021/2021_306.html

CVSS

8.8HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-78

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