What’s Vulnerable › Vulnerabilities

CVE-2021-42059

• Severity: medium (CVSS 6.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-02-03 · updated 2026-08-11
• Weakness: CWE-787

Description

An issue was discovered in Insyde InsydeH2O Kernel 5.0 before 05.08.41, Kernel 5.1 before 05.16.41, Kernel 5.2 before 05.26.41, Kernel 5.3 before 05.35.41, and Kernel 5.4 before 05.42.20. A stack-based buffer overflow leads toarbitrary code execution in UEFI DisplayTypeDxe DXE driver.

Affected products

• Insydeh2O: from 5.0 before 5.08.41; from 5.1 before 5.16.41; from 5.2 before 5.26.41; from 5.3 before 5.35.41; from 5.4 before 5.42.20 — fixed in 5.08.41, 5.16.41, 5.26.41, 5.35.41, 5.42.20
• Siemens Simatic Field Pg M5 Firmware: all versions
• Siemens Simatic Field Pg M6 Firmware: all versions
• Siemens Simatic Ipc127E Firmware: all versions
• Siemens Simatic Ipc227G Firmware: all versions
• Siemens Simatic Ipc277G Firmware: all versions
• Siemens Simatic Ipc327G Firmware: all versions
• Siemens Simatic Ipc377G Firmware: all versions
• Siemens Simatic Ipc427E Firmware: all versions
• Siemens Simatic Ipc477E Firmware: all versions
• Siemens Simatic Ipc627E Firmware: all versions
• Siemens Simatic Ipc647E Firmware: all versions
• Siemens Simatic Ipc677E Firmware: all versions
• Siemens Simatic Ipc847E Firmware: all versions
• Siemens Simatic Itp1000 Firmware: all versions

How to fix

Upgrade to a fixed version: Insydeh2O 5.08.41, 5.16.41, 5.26.41, 5.35.41. Check the vendor advisory for mitigations.

References

• https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf
• https://security.netapp.com/advisory/ntap-20220216-0008/
• https://www.insyde.com/security-pledge
• https://www.insyde.com/security-pledge/SA-2022006
• https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf
• https://security.netapp.com/advisory/ntap-20220216-0008/
• https://www.insyde.com/security-pledge
• https://www.insyde.com/security-pledge/SA-2022006
• https://www.kb.cert.org/vuls/id/796611
• https://cert-portal.siemens.com/productcert/html/ssa-306654.html

Get alerted when CVE-2021-42059 or the next vulnerability affects your stack