How severe is CVE-2020-36404?

CVE-2020-36404 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-36404 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-36404?

CVE-2020-36404 affects Keystone-engine Keystone. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-36404?

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-2020-36404 published?

CVE-2020-36404 was published on 2021-07-01 and last updated on 2026-06-17.

CVE-2020-36404

CVE-2020-36404 is a high-severity vulnerability in Keystone-engine Keystone with a CVSS 3.x base score of 7.8. 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-763.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 6.8
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-763
Affected product: Keystone-engine Keystone
Published: 2021-07-01
Last modified: 2026-06-17

Description

Keystone Engine 0.9.2 has an invalid free in llvm_ks::SmallVectorImpl<llvm_ks::MCFixup>::~SmallVectorImpl.

Frequently asked questions

What is CVE-2020-36404?: Keystone Engine 0.9.2 has an invalid free in llvm_ks::SmallVectorImpl<llvm_ks::MCFixup>::~SmallVectorImpl.
How severe is CVE-2020-36404?: CVE-2020-36404 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-36404 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-36404?: CVE-2020-36404 affects Keystone-engine Keystone. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-36404?: 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-2020-36404 published?: CVE-2020-36404 was published on 2021-07-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:keystone-engine:keystone:0.9.2:*:*:*:*:*:*:*

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