How severe is CVE-2021-38575?

CVE-2021-38575 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-38575 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-38575?

CVE-2021-38575 primarily affects Tianocore Edk2. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-38575?

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

When was CVE-2021-38575 published?

CVE-2021-38575 was published on 2021-12-01 and last updated on 2026-06-17.

CVE-2021-38575

CVE-2021-38575 is a high-severity vulnerability in Tianocore Edk2 with a CVSS 3.x base score of 8.1. 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-119.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v2: 6.8
EPSS exploit prediction: 2% (77th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Tianocore Edk2
Published: 2021-12-01
Last modified: 2026-06-17

Description

NetworkPkg/IScsiDxe has remotely exploitable buffer overflows.

Frequently asked questions

What is CVE-2021-38575?: NetworkPkg/IScsiDxe has remotely exploitable buffer overflows.
How severe is CVE-2021-38575?: CVE-2021-38575 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-38575 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-38575?: CVE-2021-38575 primarily affects Tianocore Edk2. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-38575?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-38575 published?: CVE-2021-38575 was published on 2021-12-01 and last updated on 2026-06-17.

References

Affected products (7)

cpe:2.3:a:tianocore:edk2:*:*:*:*:*:*:*:*
cpe:2.3:o:insyde:kernel:5.0:*:*:*:*:*:*:*
cpe:2.3:o:insyde:kernel:5.1:*:*:*:*:*:*:*
cpe:2.3:o:insyde:kernel:5.2:*:*:*:*:*:*:*
cpe:2.3:o:insyde:kernel:5.3:*:*:*:*:*:*:*
cpe:2.3:o:insyde:kernel:5.4:*:*:*:*:*:*:*
cpe:2.3:o:insyde:kernel:5.5:*:*:*:*:*:*:*

More vulnerabilities in Tianocore Edk2

CVE-2025-2486 — High (CVSS 8.8): The Ubuntu edk2 UEFI firmware packages accidentally allowed the UEFI Shell to be accessed in Secure Boot environments,…
CVE-2023-45235 — High (CVSS 8.3): EDK2's Network Package is susceptible to a buffer overflow vulnerability when handling Server ID option from…
CVE-2023-45234 — High (CVSS 8.3): EDK2's Network Package is susceptible to a buffer overflow vulnerability when processing DNS Servers option from a…
CVE-2023-45230 — High (CVSS 8.3): EDK2's Network Package is susceptible to a buffer overflow vulnerability via a long server ID option in DHCPv6 client.…
CVE-2019-14586 — High (CVSS 8.0): Use after free vulnerability in EDK II may allow an authenticated user to potentially enable escalation of privilege,…
CVE-2021-28210 — High (CVSS 7.8): An unlimited recursion in DxeCore in EDK II.

All CVEs affecting Tianocore Edk2 →

Other CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) vulnerabilities

CVE-2026-2778 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component. This vulnerability was fixed in…
CVE-2026-2776 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions in the Telemetry component in External Software. This vulnerability…
CVE-2025-1866 — Critical (CVSS 10.0): Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in warmcat libwebsockets allows…
CVE-2022-27625 — Critical (CVSS 10.0): A vulnerability regarding improper restriction of operations within the bounds of a memory buffer is found in the…
CVE-2022-27624 — Critical (CVSS 10.0): A vulnerability regarding improper restriction of operations within the bounds of a memory buffer is found in the…
CVE-2020-11896 — Critical (CVSS 10.0): The Treck TCP/IP stack before 6.0.1.66 allows Remote Code Execution, related to IPv4 tunneling.

Browse all CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) vulnerabilities →