Assessment
Why it matters
CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 76.0%; technical severity is CVSS 7.8.
An integer overflow was addressed with improved input validation. This issue is fixed in Security Update 2021-005 Catalina, iOS 14.8 and iPadOS 14.8, macOS Big Sur 11.6, watchOS 7.6.2. Processing a maliciously crafted PDF may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.
Who should care
- Teams operating Ipados, Iphone Os, Mac Os X +5 more
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether Ipados, Iphone Os, Mac Os X +5 more is present in the environment.
- Identify affected versions and establish whether vulnerable services are exposed or reachable.
- Apple Security patch HT212824
- Review relevant security telemetry for evidence of attempted or successful exploitation.
- Document the remediation decision and track it to verified completion.
Treatment intelligence
Remediation intelligence
Vendor sources are listed before government and third-party guidance. Confirm product applicability and change prerequisites before deployment.
Verification noteAutomated link verification has not completed for this guidance yet.
Advisory
- Apple Security advisory HT212804Apple · Vendor sourceVerification pending ↗
- Apple Security advisory HT212805Apple · Vendor sourceVerification pending ↗
- Apple Security advisory HT212806Apple · Vendor sourceVerification pending ↗
- Apple Security advisory HT212807Apple · Vendor sourceVerification pending ↗
Technical details
- CVSS vector
- CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- CWE
- CWE-20
- Affected versions
- Apple Ipados (End Excluding 14.8); Apple Iphone Os (End Excluding 12.5.5 | Start Including 13.0, End Excluding 14.8); Apple Mac Os X (Start Including 10.15, End Excluding 10.15.7 | Version 10.15.7 | Version 10.15.7 | Version 10.15.7); Apple macOS (End Excluding 11.6); Apple Multiple Products; Apple Watchos (End Excluding 7.6.2); Freedesktop Poppler (End Excluding 22.09.0); Xpdfreader Xpdf (End Excluding 4.04)
- Fixed versions
- Apple Ipados (Fixed from 14.8); Apple Iphone Os (Fixed from 12.5.5, 14.8); Apple Mac Os X (Fixed from 10.15.7); Apple macOS (Fixed from 11.6); Apple Watchos (Fixed from 7.6.2); Freedesktop Poppler (Fixed from 22.09.0); Xpdfreader Xpdf (Fixed from 4.04)
- Published
- 24 August 2021
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Required
Signal timeline
- CVE published
- Added to CISA KEV
- Latest EPSS score: 76.0%
- Signal calculated at 80
External references
- CISA Government advisory CVE-2021-30860
- Seclists Third-party advisory
- Seclists Third-party advisory
- Seclists Third-party advisory
- Seclists Third-party advisory
- Seclists Third-party advisory
- Seclists Third-party advisory
- Seclists Third-party advisory
- Seclists Third-party advisory
- Openwall Technical reference
- Security Gentoo Third-party advisory 202209 21