CVE-2021-30797

HIGHNVD 8.88.8—

8.8

This issue was addressed with improved checks. This issue is fixed in iOS 14.7, Safari 14.1.2, macOS Big Sur 11.5, watchOS 7.6, tvOS 14.7. Processing maliciously crafted web content may lead to code execution.

CVSS v3: 8.8
EG Score: 8.8(medium)
EPSS: 71.8%
KEV: Not listed

Published

September 8, 2021

Last Modified

November 21, 2024

References (10)

product-security@applehttps://support.apple.com/en-us/HT212601
product-security@applehttps://support.apple.com/en-us/HT212602
product-security@applehttps://support.apple.com/en-us/HT212604
product-security@applehttps://support.apple.com/en-us/HT212605
product-security@applehttps://support.apple.com/en-us/HT212606
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/en-us/HT212601
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/en-us/HT212602
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/en-us/HT212604
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/en-us/HT212605
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/en-us/HT212606

Patch Availability(3)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	libwebkit2gtk-4.0-dev (2.32.3-0ubuntu0.21.04.1) @ hirsute	2026-05-26	ubuntu
redhat	webkitgtk4-0:2.48.3-2.el7_9	2025-07-07	redhat
redhat	webkit2gtk3-0:2.32.3-2.el8	2021-11-09	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

All Vendor Advisories

(3)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 12× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-08 14:15 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore

Frequently asked(5)

What is CVE-2021-30797?

CVE-2021-30797 is a high vulnerability published on September 8, 2021. This issue was addressed with improved checks. This issue is fixed in iOS 14.7, Safari 14.1.2, macOS Big Sur 11.5, watchOS 7.6, tvOS 14.7. Processing maliciously crafted web content may lead to code execution.

When was CVE-2021-30797 disclosed?

CVE-2021-30797 was first published in the National Vulnerability Database on September 8, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-30797 actively exploited?

CVE-2021-30797 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 71.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-30797?

CVE-2021-30797 has a CVSS v3 base score of 8.8 (NVD).

How do I remediate CVE-2021-30797?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-30797, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-30797

Explore →

Is Your Infrastructure Affected by CVE-2021-30797?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs

CVE-2021-30797

📅 Published

🔄 Last Modified

🔗 References (10)

Patch Availability(3)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-30797?

🔗 Related CVEs(same vendor)

Same vendor

Published

Last Modified

References (10)

Frequently asked(5)

Related CVEs(same vendor)