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ExploitedIn CISA KEVFix available

CVE-2020-9818

Exploitation confirmed. First attested on 2021-11-03 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2020-06-09
  • Fixed in13.5 · 12.4.7
  • WeaknessCWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2020-06-0917:15CVE publishedNVD
  2. 2021-11-03Added to the CISA KEV catalogCISA KEV
  3. 2021-11-03Listed as exploited by GCVEGCVE
  4. 2021-11-03Exploitation first reportedCISA KEV
  5. 2025-12-1915:03SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-9818?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-9818?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Apple iphone os
BranchAffectedFixed in
13.x≥ 13.0, < 13.513.5
12.4< 12.4.712.4.7
Apple ipados
BranchAffectedFixed in
13.5< 13.513.5
Apple watchos
BranchAffectedFixed in
6.2< 6.2.56.2.5

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA3 products

As apple, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Apple iOS
    Affected
    • < iOS 13.5 and iPadOS 13.5fixed in iOS 13.5 and iPadOS 13.5custom
  • Apple iOS-1
    Affected
    • < iOS 12.4.7fixed in iOS 12.4.7custom
  • Apple watchOS
    Affected
    • < watchOS 6.2.5fixed in watchOS 6.2.5custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2020-10-16

Fix

  1. Update Apple iphone os to 13.5 · 12.4.7
  2. CISA’s required action: Apply updates per vendor instructions.due 2022-05-03

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2021-11-03
Patch Due Date
2022-05-03
Ransomware Use
Unknown
Required Action
Apply updates per vendor instructions.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
2020-06-09
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-r647-89qj-xwmp

Frequently asked questions

What is CVE-2020-9818?

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.

Is CVE-2020-9818 actively exploited?

Yes. CVE-2020-9818 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-05-03.

What is the CVSS score for CVE-2020-9818?

CVE-2020-9818 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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Sources for this record