How severe is CVE-2023-39281?

CVE-2023-39281 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-39281 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-39281?

CVE-2023-39281 primarily affects Insyde Insydeh2o. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-39281?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2023-39281 published?

CVE-2023-39281 was published on 2023-11-01 and last updated on 2026-06-17.

CVE-2023-39281

CVE-2023-39281 is a critical-severity vulnerability in Insyde Insydeh2o with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 0% (38th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Insyde Insydeh2o
Published: 2023-11-01
Last modified: 2026-06-17

Description

A stack buffer overflow vulnerability discovered in AsfSecureBootDxe in Insyde InsydeH2O with kernel 5.0 through 5.5 allows attackers to run arbitrary code execution during the DXE phase.

Frequently asked questions

What is CVE-2023-39281?: A stack buffer overflow vulnerability discovered in AsfSecureBootDxe in Insyde InsydeH2O with kernel 5.0 through 5.5 allows attackers to run arbitrary code execution during the DXE phase.
How severe is CVE-2023-39281?: CVE-2023-39281 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-39281 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-39281?: CVE-2023-39281 primarily affects Insyde Insydeh2o. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-39281?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2023-39281 published?: CVE-2023-39281 was published on 2023-11-01 and last updated on 2026-06-17.

References

Affected products (11)

cpe:2.3:a:insyde:insydeh2o:05.45.24.0039:*:*:*:*:*:*:*
cpe:2.3:a:insyde:insydeh2o:05.44.45.0017:*:*:*:*:*:*:*
cpe:2.3:a:insyde:insydeh2o:05.44.34.0055:*:*:*:*:*:*:*
cpe:2.3:a:insyde:insydeh2o:05.53.28.0013:*:*:*:*:*:*:*
cpe:2.3:a:insyde:insydeh2o:05.45.38.0005:*:*:*:*:*:*:*
cpe:2.3:a:insyde:insydeh2o:05.53.23.0011:*:*:*:*:*:*:*
cpe:2.3:a:insyde:insydeh2o:05.53.23.0014:*:*:*:*:*:*:*
cpe:2.3:a:insyde:insydeh2o:05.53.22.0008:*:*:*:*:*:*:*
cpe:2.3:a:insyde:insydeh2o:05.44.30.0022:*:*:*:*:*:*:*
cpe:2.3:a:insyde:insydeh2o:05.43.06.0021:*:*:*:*:*:*:*
cpe:2.3:a:insyde:insydeh2o:05.42.37.0031:*:*:*:*:*:*:*

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