HOMEVULNERABILITIESCVE-2021-42059
MEDIUM

CVE-2021-42059

CWE-787Published: February 3, 2022· Updated: Jun 17, 2026

6.7
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-42059 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 6.7.

From a weakness classification perspective (CWE-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.High
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

insyde1 product(s)
insydeh2o
siemens28 product(s)
simatic field pg m5 firmwaresimatic field pg m5simatic field pg m6 firmwaresimatic field pg m6simatic ipc127e firmwaresimatic ipc127esimatic ipc227g firmwaresimatic ipc227gsimatic ipc277g firmwaresimatic ipc277gsimatic ipc327g firmwaresimatic ipc327g+16
Source: NVD CPE · 29 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf
ADVISORYhttps://security.netapp.com/advisory/ntap-20220216-0008/
ADVISORYhttps://www.insyde.com/security-pledge
ADVISORYhttps://www.insyde.com/security-pledge/SA-2022006
ADVISORYhttps://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf
ADVISORYhttps://security.netapp.com/advisory/ntap-20220216-0008/
ADVISORYhttps://www.insyde.com/security-pledge
ADVISORYhttps://www.insyde.com/security-pledge/SA-2022006

All References (9)

→
https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdfThird Party Advisory
→
https://security.netapp.com/advisory/ntap-20220216-0008/Third Party Advisory
→
https://www.insyde.com/security-pledgeVendor Advisory
→
https://www.insyde.com/security-pledge/SA-2022006Vendor Advisory
→
https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdfThird Party Advisory
→
https://security.netapp.com/advisory/ntap-20220216-0008/Third Party Advisory
→
https://www.insyde.com/security-pledgeVendor Advisory
→
https://www.insyde.com/security-pledge/SA-2022006Vendor Advisory
→
https://www.kb.cert.org/vuls/id/796611

Quick Facts

CVE IDCVE-2021-42059
CVSS Score6.7 / 10
SeverityMEDIUM
WeaknessCWE-787
CISA KEVNo
Affected2 vendor(s)
PublishedFeb 3, 2022

Related CVEs (CWE-787)

CVE-2004-0978
10.0
CVE-2002-2227
10.0
CVE-2004-0574
10.0
CVE-2026-42369
10.0
CVE-2026-4746
10.0
CVE-2011-1807
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-42059 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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