How severe is CVE-2021-21132?

CVE-2021-21132 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-21132 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 23% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21132?

CVE-2021-21132 primarily affects Google Chrome. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-21132?

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-2021-21132 published?

CVE-2021-21132 was published on 2021-02-09 and last updated on 2026-06-17.

CVE-2021-21132

CVE-2021-21132 is a critical-severity vulnerability in Google Chrome with a CVSS 3.x base score of 9.6. Its EPSS exploit-prediction score of 23% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-1021.

Key facts

Severity: Critical (CVSS 3.x base score 9.6)
CVSS v2: 6.8
EPSS exploit prediction: 23% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-1021
Affected product: Google Chrome
Published: 2021-02-09
Last modified: 2026-06-17

Description

Inappropriate implementation in DevTools in Google Chrome prior to 88.0.4324.96 allowed a remote attacker to potentially perform a sandbox escape via a crafted Chrome Extension.

Frequently asked questions

What is CVE-2021-21132?: Inappropriate implementation in DevTools in Google Chrome prior to 88.0.4324.96 allowed a remote attacker to potentially perform a sandbox escape via a crafted Chrome Extension.
How severe is CVE-2021-21132?: CVE-2021-21132 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-21132 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 23% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21132?: CVE-2021-21132 primarily affects Google Chrome. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-21132?: 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-2021-21132 published?: CVE-2021-21132 was published on 2021-02-09 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:edge_chromium:*:*:*:*:*:*:*:*

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