CVE-2020-9818

Apple iOS, iPadOS, and watchOS: Out-of-Bounds Write

As of , CVE-2020-9818 in Apple iOS, iPadOS, and watchOS is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch soon.

Exploited
Yes: CISA listed it on 3 November 2021
US federal deadline
3 May 2022181 days after CISA listed it. US federal civilian agencies must fix it by then.
Used in ransomware campaigns
Not known to CISA
EPSS score
0.02Higher than 82% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
EPSS when listed
Not availableCISA listed it before 4 February 2022, where the EPSS files we read begin.
Public exploit
None foundNeither Metasploit nor Exploit-DB lists one.
Fix
No vendor link in CISA's entry

What CISA says to do

Apply updates per vendor instructions.

CISA's required action

What the flaw is

Apple iOS, iPadOS, and watchOS Mail contains an out-of-bounds write vulnerability which may allow memory modification or application termination when processing a maliciously crafted mail message.

CISA's 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.

The CVE record's description, from apple

CVE published
9 June 2020
Assigned by
apple
CVSS
8.8 High (CVSS 3.1, from CISA-ADP)
CWE-787
Out-of-bounds Write
CISA SSVC, exploitation
active
CISA SSVC, automatable
no
CISA SSVC, technical impact
total

Timeline

  1. The CVE record was published.
  2. CISA added it to its list of exploited vulnerabilities.
  3. The US federal deadline to fix it.

iOS, iPadOS, and watchOS: other exploited entries

VulnerabilityProductOur groupListedDeadlineEPSS
CVE-2021-1879WebKit Cross-Site Scripting (XSS)Apple iOS, iPadOS, and watchOSPatch soon0.07
CVE-2023-41061Wallet Code ExecutionApple iOS, iPadOS, and watchOSPatch soon0.04
CVE-2020-9819Memory CorruptionApple iOS, iPadOS, and watchOSPatch soon0.02

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