7.5

CVE-2020-5953: insyde insydeh2o

CVSS: 7.5v3.1HighModified
Published 03-02-2022Last modified 11-08-2026
Open JSON

Vulnerability summary

CVE-2020-5953 is a high (CVSS 7.5) vulnerability in insyde insydeh2o. EPSS estimates a 0.28% chance of exploitation in the next 30 days, higher than 19.5% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
0.28%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 03-02-2022
    PublishedVulnerability first disclosed.
  2. 11-08-2026
    Last modifiedVulnerability information updated.

Description

A vulnerability exists in System Management Interrupt (SWSMI) handler of InsydeH2O UEFI Firmware code located in SWSMI handler that dereferences gRT (EFI_RUNTIME_SERVICES) pointer to call a GetVariable service, which is located outside of SMRAM. This can result in code execution in SMM (escalating privilege from ring 0 to ring -2).

CVSS metrics

2 scores · 1 source · 2 versions

EPSS trend

Probability

0.28%

Chance of exploitation in the next 30 days

Percentile

20%

Versus all other CVEs

30-day change

0.00 pp

From 0.28% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.28%

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

No weakness data has been published for this record.

Affected systems

Siemens16 products
Insyde1 product
  • insydeh2o5.12.09.0074 | 5.23.04.0045 | 5.23.45.0023 | 5.33.15.0034 | 5.34.03.0029 | 5.42.03.0010

2 vendors · 17 products

References

6 links