CVE-2021-30952: Apple Multiple Products

Should you act?

Exploited: patch now if you run it

CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.

Yes, if you run Apple Multiple Products. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-03-05, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-03-26; treat that as the outer limit, not the target.
EPSS 7.0%, percentile 94: FIRST’s model estimates a 7.0% chance of exploitation activity in the next 30 days, higher than 94% of all scored CVEs (elevated). EPSS is a probability, not a verdict.
Needs a user to click or open something. Phishing makes that realistic, but it is not wormable.

What it is

An integer overflow was addressed with improved input validation. This issue is fixed in tvOS 15.2, macOS Monterey 12.1, Safari 15.2, iOS 15.2 and iPadOS 15.2, watchOS 8.3. Processing maliciously crafted web content may lead to arbitrary code execution.

CISA’s summary

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.

Weakness type: CWE-190.

Product: Apple Multiple Products · Assigned by: apple · Published: 2021-08-24

Affected and fixed versions

Vendor	Product	Affected versions (per CVE record)
Apple	watchOS	unspecified < 8.3
Apple	iOS and iPadOS	unspecified < 15.2
Apple	macOS	unspecified < 12.1
Apple	macOS	unspecified < 15.2
Apple	macOS	unspecified < 15.2

Severity scores

Scored by	CVSS	Score	Vector
CISA-ADP	3.1	8.8 High	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`

Attack vector: network (remotely reachable)
Attack complexity: low
Privileges required: none (no login)
User interaction: required (a user must click/open something)
Scope: unchanged

CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.

Exploitation and urgency

CISA KEV: added 2026-03-05; federal due date 2026-03-26. Known ransomware use: Unknown.
CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA SSVC assessment: exploitation active, automatable no, technical impact total.
FIRST EPSS (model of 2026-10-21): 6.96% probability of exploitation activity in the next 30 days; percentile 94.

Timeline

2021-08-24 — CVE record published by apple
2026-03-05 — Added to CISA’s Known Exploited Vulnerabilities catalog
2026-03-06 — CVE record last updated
2026-03-26 — CISA remediation deadline for US federal agencies

Sources and references

Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.

Should you act?

What it is

CISA’s summary

Affected and fixed versions

Severity scores

Exploitation and urgency

Timeline

Sources and references

Vendor and project advisories, patches

Vulnerability records

Government

Other references from the CVE record and advisory