7.2

CVE-2020-27339: insyde insydeh2o Improper Input Validation

CVSS: 7.2v2.0HighModified
Published 16-06-2021Last modified 11-08-2026
Open JSON

Vulnerability summary

CVE-2020-27339 is a high (CVSS 7.2) Improper Input Validation vulnerability in insyde insydeh2o. EPSS estimates a 0.32% chance of exploitation in the next 30 days, higher than 23% of scored vulnerabilities.

Overall risk
29/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.2/10
010
High · v2.0 (NVD)
EPSS score
0.32%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Duplicates 1
CVE-2021-41610

Timeline

  1. 16-06-2021
    PublishedVulnerability first disclosed.
  2. 11-08-2026
    Last modifiedVulnerability information updated.

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).

CVSS metrics

2 scores · 1 source · 2 versions

EPSS trend

Probability

0.32%

Chance of exploitation in the next 30 days

Percentile

23%

Versus all other CVEs

30-day change

0.00 pp

From 0.32% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.32%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Siemens16 products
Insyde1 product
  • insydeh2o≥ 5.3, < 5.34.44 | ≥ 5.2, < 5.25.44 | ≥ 5.1, < 5.16.25 | ≥ 5.4, < 5.42.44 | ≥ 5.3, < 5.35.25 | ≥ 5.2, < 5.26.25 | ≥ 5.4, < 5.43.25

2 vendors · 17 products

References

5 links