CVE-2021-1879

criticalknown exploitedcovered by 1 sourcefirst seen 2021-11-03

Actively exploited. CVE-2021-1879 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.

Apple iOS, iPadOS, and watchOS WebKit contain an unspecified vulnerability that allows for universal cross-site scripting (XSS) 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: This vulnerability allows for universal cross-site scripting (XSS) when processing malicious web content.
Who is affected: Users of Apple iOS, iPadOS, and watchOS that utilize WebKit.
Urgency: Remediation is urgent due to active exploitation and critical severity.
Action: Update to the latest versions of iOS, iPadOS, and watchOS.

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 93% of all EPSS-scored CVEs.

Advisory coverage (1)

criticalexploitedCVE-2021-1879: Apple iOS, iPadOS, and watchOS WebKit Cross-Site Scripting (XSS) Vulnerabilitycisa-kev · 2021-11-03

External references

NVD record for CVE-2021-1879

CVE.org record

CISA KEV catalog

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