How severe is CVE-2021-21117?

CVE-2021-21117 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-2021-21117 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21117?

CVE-2021-21117 affects Google Chrome. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-21117?

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-2021-21117 published?

CVE-2021-21117 was published on 2021-02-09 and last updated on 2026-06-17.

CVE-2021-21117

CVE-2021-21117 is a high-severity vulnerability in Google Chrome 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-59.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 6.9
EPSS exploit prediction: 0% (13th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-59
Affected product: Google Chrome
Published: 2021-02-09
Last modified: 2026-06-17

Description

Insufficient policy enforcement in Cryptohome in Google Chrome prior to 88.0.4324.96 allowed a local attacker to perform OS-level privilege escalation via a crafted file.

Frequently asked questions

What is CVE-2021-21117?: Insufficient policy enforcement in Cryptohome in Google Chrome prior to 88.0.4324.96 allowed a local attacker to perform OS-level privilege escalation via a crafted file.
How severe is CVE-2021-21117?: CVE-2021-21117 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-2021-21117 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21117?: CVE-2021-21117 affects Google Chrome. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-21117?: 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-2021-21117 published?: CVE-2021-21117 was published on 2021-02-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*

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