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CVE-2020-9819

Apple iOS, iPadOS, and watchOS Memory Corruption

4.3 MEDIUMActively exploited (CISA KEV)EPSS 2.18%
  1. Published9 Jun 2020
  2. Added to CISA KEV3 Nov 2021
  3. Remediation due3 May 2022
Actively exploited (CISA KEV)

Apple iOS, iPadOS, and watchOS Mail contains a memory corruption vulnerability that may allow heap corruption when processing a maliciously crafted mail message.

Added to KEV: 3 Nov 2021Federal remediation due: 3 May 2022

Description

A memory consumption issue was addressed with improved memory handling. This issue is fixed in iOS 13.5 and iPadOS 13.5, iOS 12.4.7, watchOS 6.2.5, watchOS 5.3.7. Processing a maliciously crafted mail message may lead to heap corruption.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityLow
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Affected products

Apple iPadOS< 13.5
Apple iPhone OS≥ 13.0 < 13.5 · < 12.4.7
Apple Watchos≥ 6.0.0 < 6.2.5 · < 5.3.7

Remediation

Fixed in
Apple iPadOS≥ 13.5
Apple iPhone OS≥ 13.5
Apple Watchos≥ 6.2.5

References

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Frequently asked

Is CVE-2020-9819 being actively exploited?

Yes. CVE-2020-9819 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 3 Nov 2021.

How severe is CVE-2020-9819?

CVE-2020-9819 has a CVSS 3.1 base score of 4.3, rated medium. EPSS estimates a 2.18% probability of exploitation.

Which products are affected by CVE-2020-9819?

Affected products include Apple iPadOS, Apple iPhone OS, Apple Watchos.

How do I fix CVE-2020-9819?

Upgrade affected software to a fixed version, for example Apple iPadOS 13.5, Apple iPhone OS 13.5, Apple Watchos 6.2.5 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2020-9819 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.