# CVE-2021-1871

A logic issue was addressed with improved restrictions. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, iOS 14.4 and iPadOS 14.4. A remote attacker may be able to cause arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..

- Page: https://www.vulneraibility.com/cve/CVE-2021-1871
- CVSS: 9.8
- Known exploited: yes, in CISA KEV since 2021-11-03; CISA due date 2021-11-17
- EPSS: 7.00% (percentile 94.3)
- CISA SSVC: exploitation active, automatable yes, technical impact total (assessed 2025-01-29)
- Published: 2021-04-02

## Affected versions

- Apple iOS and iPadOS: affected < 14.4
- Apple macOS: affected < 11.2

A version outside these ranges is not a statement that it is unaffected.

## References

- [other] https://support.apple.com/en-us/HT212147
- [other] https://support.apple.com/en-us/HT212146
- [advisory] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/
- [advisory] https://www.debian.org/security/2021/dsa-4923
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1871

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.