CVE-2020-27339

MEDIUM

6.7

CVSS Score

Published: June 16, 2021 at 03:49 PM UTC

Updated: August 11, 2026 at 01:28 PM UTC

35 products affected across 2 vendorsInsydeH2OSIMATIC IPC477E FirmwareSIMATIC ITP1000 Firmware

Using N/A by N/A?

Get instant alerts when new vulnerabilities affect N/A - before attackers find them.

Real-time alertsTrack your software stackFree plan available

Start Free Sign In

Severity

MEDIUM6.7

Exploit prediction

EPSS 0.3%

Description

In the kernel in Insyde InsydeH2O 5.x, certain SMM drivers did not correctly validate the CommBuffer and CommBufferSize parameters, allowing callers to corrupt either the firmware or the OS memory. The fixed versions for this issue in the AhciBusDxe, IdeBusDxe, NvmExpressDxe, SdHostDriverDxe, and SdMmcDeviceDxe drivers are 05.16.25, 05.26.25, 05.35.25, 05.43.25, and 05.51.25 (for Kernel 5.1 through 5.5).

Affected

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

InsydeH2O · Insyde

95%

5.1 ≤ v < 5.16.255.2 ≤ v < 5.25.445.2 ≤ v < 5.26.255.3 ≤ v < 5.34.445.3 ≤ v < 5.35.255.4 ≤ v < 5.42.445.4 ≤ v < 5.43.25

Affected range stops below 5.16.25, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.25.44, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.26.25, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.34.44, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.35.25, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.42.44, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.43.25, so it looks safe — our inference, not a vendor statement

RUGGEDCOM APR1808 Firmware · Siemens

95%

All versions

siemens-ruggedcom-apr1808 (same device)

SIMATIC Field Pg M5 Firmware · Siemens

95%

v < V22.01.10

Affected range stops below V22.01.10, so it looks safe — our inference, not a vendor statement

siemens-simatic-field-pg-m5 (same device)

SIMATIC Field Pg M6 Firmware · Siemens

95%

v < V26.01.13

Affected range stops below V26.01.13, so it looks safe — our inference, not a vendor statement

siemens-simatic-field-pg-m6 (same device)

SIMATIC IPC127E Firmware · Siemens

95%

All versions

siemens-simatic-ipc127e (same device)

SIMATIC IPC227G Firmware · Siemens

95%

All versions

siemens-simatic-ipc227g (same device)

SIMATIC IPC277G Firmware · Siemens

95%

v < V28.01.04

Affected range stops below V28.01.04, so it looks safe — our inference, not a vendor statement

siemens-simatic-ipc277g (same device)

SIMATIC IPC327G Firmware · Siemens

95%

v < V28.01.04

Affected range stops below V28.01.04, so it looks safe — our inference, not a vendor statement

siemens-simatic-ipc327g (same device)

SIMATIC IPC377G Firmware · Siemens

95%

v < V28.01.04

Affected range stops below V28.01.04, so it looks safe — our inference, not a vendor statement

siemens-simatic-ipc377g (same device)

SIMATIC IPC427E Firmware · Siemens

95%

All versions

siemens-simatic-ipc427e (same device)

Remediation

No guide yet

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

Patch and advisory references

https://www.insyde.com/security-pledge/SA-2021001

References (5)

x_refsource_CONFIRMThird Party Advisory

Source: [email protected]

https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf

x_refsource_CONFIRMThird Party Advisory

Source: [email protected]

https://security.netapp.com/advisory/ntap-20220216-0005/

x_refsource_MISCVendor Advisory

Source: [email protected]

https://www.insyde.com/security-pledge/SA-2021001

Source: af854a3a-2127-422b-91ae-364da2661108

https://www.kb.cert.org/vuls/id/796611

Source: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e

https://cert-portal.siemens.com/productcert/html/ssa-306654.html

CVSS

6.7MEDIUM[email protected]

Attack Vector: LOCAL
Complexity: LOW
Privileges: HIGH
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-20

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create account Sign in

Free plan, no card