Threats / Apple / CVE-2021-30762
CVE-2021-30762
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-09-19
Apple iOS vulnerability
Apple iOS WebKit use-after-free vulnerability enabling remote code execution through maliciously crafted web content. Affects Safari and other WebKit-dependent applications.
Verdict
Today item — known-exploited.
A memory safety defect in WebKit's HTML parsing allows attackers to achieve arbitrary code execution by delivering malicious web content to vulnerable iOS devices. The vulnerability has been observed in active exploitation.
CISA KEV Yes · 2021-11-034EPSS 0.10986 (verify live)5CVSS 8.8 (CISA)3CISA SSVC Exploitation: active · Automatable: no · Impact: total3
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
2 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03).
Probability (EPSS)
EPSS 0.10986 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
CVSS 8.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) · Affected: Apple, iOS. Confirm exact fixed builds in the vendor advisory.CVSS — CISA-assigned via the ADP container (CVE.org), version 3.1; the CNA left no metrics, so CISA's own score is used ahead of NVD.
Weakness (CWE)
Mapped to CWE-416 Use After Free — weakness family: Memory safety.CWE assignment from the public NVD record (may be stale); the weakness class drives how the flaw is exploited.
CISA SSVC (triage disposition)
Exploitation: active · Automatable: no · Technical Impact: totalCISA's own stakeholder-specific triage inputs, published in the CVE record (CISA Coordinator role). NOTE: this is CISA's three decision points; the final Act/Attend/Track decision also requires a Mission & Well-being input not published here, so no overall decision is asserted.
Currency of the record
CISA added this to its KEV catalog 56 days after the CVE record was published.KEV lag = CISA-KEV dateAdded − CVE.org datePublished; a floor on how long the known-exploited flaw sat in the public record before the federal catalog listed it. Severity/weakness here is CNA- or CISA-assigned (current at disclosure), independent of NVD's analysis backlog.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I craft a malicious webpage containing specially formatted HTML that triggers a use-after-free condition in WebKit's parser.
Business
User visits attacker-controlled or compromised website via Safari or WebKit-based browser, leading to device compromise.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I host the exploit payload on a website or inject it into legitimate sites through watering hole techniques.
Business
Attackers gain code execution on iOS devices without user interaction beyond visiting a webpage, enabling data theft or device takeover.
3
Lateral reach — past segmentation narrative 3
Attacker
I distribute the malicious content through phishing, social engineering, or ad networks to maximize victim reach.
Business
Large-scale compromise of iOS user base with potential for credential harvesting, surveillance, or lateral movement to corporate networks.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05
Coverage & confidence
— what we know, and what we don’tEstablished (cited)
Coverage gaps — stated, not hidden
Disclosure & credit2
Catalogued by appleCNA
Credited with finding itNo finder is named in the public CVE record or the scanned vendor advisory — attribution scoped to the sources checked.
Found an error? Propose a correction.
A correction is a cited counter-claim — it must cite a source,
gets reviewed by a second human, and is never auto-applied. See the
correction convention and our identity
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