Is CVE-2020-9818 actively exploited?

Yes. KEV Intelligence tracks CVE-2020-9818 as a known exploited vulnerability. Confidence is confirmed.

What exploitation activity has KEV Intelligence observed?

KEV Intelligence has not yet recorded sensor-observed exploitation attempts for CVE-2020-9818. Our sensors continue to monitor for activity targeting this CVE.

Which versions are affected?

CVE-2020-9818 affects Apple iOS and 2 other products. Reported affected versions include unspecified to < iOS 13.5 and iPadOS 13.5, unspecified to < iOS 12.4.7, and unspecified to < watchOS 6.2.5.

Yes. CVE-2020-9818 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2020-9818

Q: How should organizations remediate it?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Q: Is it in CISA KEV?

Yes. CVE-2020-9818 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

iOS

Apple / iOS · affected before iOS 13.5 and iPadOS 13.5

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Severity: CVSS 8.8 · High
Confidence: Confirmed
Exploit status: Exploited in the wild
EPSS: 2.3%
First observed: —
Last observed: —

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2020-9818 is an unauthenticated vulnerability affecting Apple iOS and 2 other products. An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 13.5 and iPadOS 13.5,...

Is it exploited?

Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.

Who is affected?

Apple / iOS affected before ios 13.5 and ipados 13.5.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

An out-of-bounds write issue was addressed with improved bounds checking

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 13.5 and iPadOS 13.5, iOS 12.4.7, watchOS 6.2.5.

Processing a maliciously crafted mail message may lead to unexpected memory modification or application termination.

Vendor Product Affected Status

Apple iOS Before iOS 13.5 and iPadOS 13.5 Affected

Apple iOS-1 Before iOS 12.4.7 Affected

Apple watchOS Before watchOS 6.2.5 Affected

Published: 09 Jun 2020
Exploitation Reported: 03 Nov 2021
Attack vector: Remote
Complexity: Low
Privileges: None
User interaction: Required

CVE References

CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2020-9818
support.apple.com/HT211168 support.apple.com · CVE Record https://support.apple.com/HT211168
support.apple.com/HT211175 support.apple.com · CVE Record https://support.apple.com/HT211175
support.apple.com/HT211169 support.apple.com · CVE Record https://support.apple.com/HT211169

Exploitation evidence

Why KEV Intelligence marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CISA

Recorded 03 Nov 2021

Independent exploitation attestation added to the KEV Intelligence record.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.

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Source	Added
CISA First	2021-11-03 00:00 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets: 0
User-Agents: 0

Raw values available in Pro and Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

8.8 High

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

EPSS

2.3%

Weaknesses

Out-of-bounds Write CWE-787

All CVSS Scores

CVSS v3.1 8.8 High

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

CVSS v2.0 6.8 Medium

AV:N/AC:M/Au:N/C:P/I:P/A:P

Timeline

From disclosure to observed exploitation

03 Nov 2021
Added to CISA KEV

Listed in the CISA Known Exploited Vulnerabilities catalog
09 Jun 2020
CVE published

Vulnerability disclosed publicly
02 Mar 2020
CVE ID reserved

Identifier reserved by the CNA

Pro API

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Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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Evidence confidence and provenance
First-party sensor telemetry
PoC and scanner references
Affected versions and enrichment
Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2020-9818

Free JSON includes basic KEV fields

{
  "cve_id": "CVE-2020-9818",
  "confidence": "Confirmed",
  "cvss_score": 8.8,
  "cvss_estimated": false,
  "epss_score": 0.02286,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

Early warning alerts

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