CVE-2021-1789

Exploitation

Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalog on 2022-05-04. Federal remediation due 2022-05-25.

SSVC decision

• ExploitationactiveCISA reports credible evidence of active exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

14.54% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 96.4% of scored records. A rank, not a probability.

NVD base score

8.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

NVD analysis status

Analyzed. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-04-02 18:01Z5 YR AGO

Last updated

2025-10-21 23:25Z10 MO AGO

Reserved

2020-12-08

Assigning CNA

apple

Record state

PUBLISHED

Severity

High (CVSS 8.8)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Weaknesses

• CWE-843Access of Resource Using Incompatible Type ('Type Confusion')Base

Data version

5.1

Document digest

970614a04e410e6c6312ec0d91bd6409d2fabe416f28ce2cdaee5a9c3867e194

• support.apple.comhttps://support.apple.com/en-us/HT212147x_refsource_MISC
• support.apple.comhttps://support.apple.com/en-us/HT212146x_refsource_MISC
• support.apple.comhttps://support.apple.com/en-us/HT212148x_refsource_MISC
• support.apple.comhttps://support.apple.com/en-us/HT212149x_refsource_MISC
• support.apple.comhttps://support.apple.com/en-us/HT212152x_refsource_MISC
• lists.fedoraproject.orgFEDORA-2021-864dc37032https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2021-619711d709https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JN6ZOD62CTO54CHTMJTHVEF6R2Y532TJ/vendor-advisoryx_refsource_FEDORA
• security.gentoo.orgGLSA-202104-03https://security.gentoo.org/glsa/202104-03vendor-advisoryx_refsource_GENTOO
• www.cisa.govhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1789government-resource