Vulnerability

CVE-2021-30952

High· 7.8KEVCVSS7.8EPSS7%

.rules3/5

Apple Multiple Products Integer Overflow or Wraparound Vulnerability

Apple tvOS, macOS, Safari, iPadOS and watchOS contain an integer overflow or wraparound vulnerability due to the processing of maliciously crafted web content that may lead to arbitrary code execution.

Threat signal

89/100

Severe

Severity

high

CVSS

7.8

EPSS

Active

KEV

CISA KEV — actively exploited

82d overdue

AffectedApple — Multiple Products

Added to KEV

2026-03-05

Federal patch due (BOD 22-01)

2026-03-26

Required action (CISA verbatim)

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Vendor advisory + references

CISA description: “Apple tvOS, macOS, Safari, iPadOS and watchOS contain an integer overflow or wraparound vulnerability due to the processing of maliciously crafted web content that may lead to arbitrary code execution.”

CVSS

v3.1Open in FIRST calculator →

7.8/ 10HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack VectorLocalRequires local access — shell, console, or local app.
Attack ComplexityLowNo special conditions — exploit works reliably.
Privileges RequiredNoneUnauthenticated — no credentials needed.
User InteractionRequiredRequires user action (click, file open, etc).
ScopeUnchangedImpact contained to the vulnerable component.
Confidentiality ImpactHighTotal disclosure of sensitive data.
Integrity ImpactHighTotal compromise of integrity — full data modification possible.
Availability ImpactHighTotal loss of availability — full DoS possible.

EPSS

Exploit prediction · 30-day horizonFIRST.org →

7.17%

probability of exploitation in next 30 days

p93

higher than 93% of all CVEs

6-day trend↑ 6.4pp

Mid-pack — moderate exploitation likelihood.

Vendor VEX

No VEX statements published for CVE-2021-30952. Vendors publish VEX (Vulnerability Exploitability eXchange) to assert per-product whether a CVE is actually exploitable in their distribution.

SSVCAct

Active exploitation with total impact on essential/support systems

exploitation: active
automatable: no
impact: total
mission: support

Lifecycle

2023-06-12Vendor advisory · amazon-linuxALAS2-2023-2088 — ALAS2-2023-2088 (important): webkitgtk4
2026-03-05Added to CISA KEVransomware: Unknown
2026-03-05Published
2026-03-26Federal patch due (BOD 22-01)
2026-06-15Last modified1 source

Entity graph

2 nodes · 1 edges · click to pivot

CVEActorVendor advisoryIOCNews

Vendor advisories

amazon-linuxALAS2-2023-2088ALAS2-2023-2088 (important): webkitgtk4

No source-event history recorded yet. New revisions will appear here as ingestors re-fetch this CVE.