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CVE-2023-39283· NVD / CVE Program· CNA mitre

An SMM memory corruption vulnerability in the SMM driver (SMRAM write) in CsmInt10HookSmm in Insyde InsydeH2O with kernel 5.0 through 5.5 al

An SMM memory corruption vulnerability in the SMM driver (SMRAM write) in CsmInt10HookSmm in Insyde InsydeH2O with kernel 5.0 through 5.5 allows attackers to send arbitrary data to SMM which could lead to privilege escalation.

HighCVSS 7.8 · v3.1—No exploit No fix recorded
Published
Nov 2, 2023
Updated
Jun 17, 2026
EPSS
0.2% · 8th percentile
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Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

Affected systems

VendorProduct
insydeinsydeh2o

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • insyde insydeh2o5.0 and later · up to 5.5 inclusive
  • insyde insydeh2o5.5.05.53.22
  • insyde insydeh2o5.6
  • insyde insydeh2o5.6.05.60.22

Same product

insyde: all records

Other highest-scoring records for the same primary product.

  • CVE-2023-39281A stack buffer overflow vulnerability discovered in AsfSecureBootDxe in Insyde InsydeH2O with kernel 5.0 through 5.5 allows attackers to run
    39Monitor
  • CVE-2021-41842An issue was discovered in AtaLegacySmm in the kernel 5.0 before 05.08.46, 5.1 before 05.16.46, 5.2 before 05.26.46, 5.3 before 05.35.46, 5.
    39Monitor
  • CVE-2023-22613An issue was discovered in IhisiSmm in Insyde InsydeH2O with kernel 5.0 through 5.5.
    35Monitor
  • CVE-2023-22614An issue was discovered in ChipsetSvcSmm in Insyde InsydeH2O with kernel 5.0 through 5.5.
    35Monitor
  • CVE-2023-22612An issue was discovered in IhisiSmm in Insyde InsydeH2O with kernel 5.0 through 5.5.
    35Monitor
  • CVE-2023-22615An issue was discovered in IhisiSmm in Insyde InsydeH2O with kernel 5.0 through 5.5.
    33Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2023-392811 days apartA stack buffer overflow vulnerability discovered in AsfSecureBootDxe in Insyde InsydeH2O with kernel 5.0 through 5.5 allows attackers to run
    39Monitor
  • CVE-2023-22612205 days apartAn issue was discovered in IhisiSmm in Insyde InsydeH2O with kernel 5.0 through 5.5.
    35Monitor
  • CVE-2023-22613205 days apartAn issue was discovered in IhisiSmm in Insyde InsydeH2O with kernel 5.0 through 5.5.
    35Monitor
  • CVE-2023-22614205 days apartAn issue was discovered in ChipsetSvcSmm in Insyde InsydeH2O with kernel 5.0 through 5.5.
    35Monitor
  • CVE-2023-22615205 days apartAn issue was discovered in IhisiSmm in Insyde InsydeH2O with kernel 5.0 through 5.5.
    33Monitor
  • CVE-2022-35895407 days apartAn issue was discovered in Insyde InsydeH2O with kernel 5.0 through 5.5.
    32Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-787 · Out-of-bounds Write

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

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Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records