CVE-2021-30952

Exploitation

Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalog on 2026-03-05. Federal remediation due 2026-03-26.

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

6.96% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 93.6% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

CVSS:3.1/AV:L/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

2021-08-24 18:50Z5 YR AGO

Last updated

2026-03-06 05:01Z6 MO AGO

Reserved

2021-04-13

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-190Integer Overflow or WraparoundBase

Data version

5.2

Document digest

cb3515db1f545408510d5d5c8223e2b8c72b1006f2314a2aa035621f07ee9e24

• support.apple.comhttps://support.apple.com/en-us/HT212975x_refsource_MISC
• support.apple.comhttps://support.apple.com/en-us/HT212976x_refsource_MISC
• support.apple.comhttps://support.apple.com/en-us/HT212978x_refsource_MISC
• support.apple.comhttps://support.apple.com/en-us/HT212980x_refsource_MISC
• support.apple.comhttps://support.apple.com/en-us/HT212982x_refsource_MISC
• www.openwall.com[oss-security] 20220121 WebKitGTK and WPE WebKit Security Advisory WSA-2022-0001http://www.openwall.com/lists/oss-security/2022/01/21/2mailing-listx_refsource_MLIST
• lists.fedoraproject.orgFEDORA-2022-25a98f5d55https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7EQVZ3CEMTINLBZ7PBC7WRXVEVCRHNSM/vendor-advisoryx_refsource_FEDORA
• www.debian.orgDSA-5061https://www.debian.org/security/2022/dsa-5061vendor-advisoryx_refsource_DEBIAN
• www.debian.orgDSA-5060https://www.debian.org/security/2022/dsa-5060vendor-advisoryx_refsource_DEBIAN
• lists.fedoraproject.orgFEDORA-2022-f7366e60cbhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HQKWD4BXRDD2YGR5AVU7H5J5PIQIEU6V/vendor-advisoryx_refsource_FEDORA
• cloud.google.comhttps://cloud.google.com/blog/topics/threat-intelligence/coruna-powerful-ios-exploit-kitthird-party-advisory
• www.cisa.govhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30952government-resource