CVE-2021-30858

criticalknown exploitedpublic exploitcovered by 1 sourcefirst seen 2021-11-03

Actively exploited. CVE-2021-30858 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.

Public exploit code is available. Proof-of-concept or working exploit code for CVE-2021-30858 is indexed in GitHub PoC. Expect opportunistic scanning and exploitation attempts — prioritize remediation.

Apple iOS, iPadOS, and macOS WebKit contain a use-after-free vulnerability that leads to code execution when processing maliciously crafted web content. This vulnerability could impact HTML parsers that use WebKit, including but not limited to Apple Safari and non-Apple products which rely on WebKit for HTML processing.

CSIRTS triage

What: A use-after-free vulnerability in WebKit leads to code execution when processing malicious web content.
Who is affected: Users of Apple iOS, iPadOS, and macOS with WebKit.
Urgency: Remediation is urgent due to active exploitation and critical severity.
Action: Update to the latest version of iOS, iPadOS, or macOS.

AI-assisted analysis generated from the source advisory — verify against the original.

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Exploitation outlook

Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 96% of all EPSS-scored CVEs.

Exploit availability

Public exploit or proof-of-concept code for CVE-2021-30858 is indexed in these free datasets. Available exploit code raises real-world risk independent of the CVSS score.

GitHub PoCPublic proof-of-concept repositories on GitHub reference this CVE.look it up ↗

Advisory coverage (1)

criticalexploitedCVE-2021-30858: Apple iOS, iPadOS, macOS Use-After-Free Vulnerabilitycisa-kev · 2021-11-03

External references

NVD record for CVE-2021-30858

CVE.org record

CISA KEV catalog

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