CVE-2020-9818 kev in the critical feed json
An out-of-bounds write issue was addressed with improved bounds checking.
published 2020-06-09 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-30597
- cvss
- 8.8
- version 3.1, CNA
- cisa kev
- Exploited
- added 2021-11-03
- epss
- 2.3%
- EPSS 2.3% chance of exploitation in 30 days, percentile 83%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
cisa required action Apply updates per vendor instructions.
- Apple iOS iOS 13.5 and iPadOS 13.5
- Apple iOS-1 iOS 12.4.7
- Apple watchOS watchOS 6.2.5
Timeline
- Published
- Added to CISA KEV
- CISA patch deadline
- CISA SSVC: exploitation active
Known exploited
- Added
- 5 y ago
- Patch by
- 2022-05-03 (4 y ago)
- Ransomware
- Not known
- Required action
- Apply updates per vendor instructions.
- Vendor, product
- Apple, iOS, iPadOS, and watchOS
- CISA name
- Apple iOS, iPadOS, and watchOS Out-of-Bounds Write Vulnerability
CISA SSVC
- Exploitation
- Active, exploited in the wild
- Automatable
- no
- Technical impact
- total
- Assessed
- 14 mo ago
Exploit prediction
2.34% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| CNA | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.8 | AV:N/AC:M/Au:N/C:P/I:P/A:P |
Affected products
- Apple iOS
- Apple iOS-1
- Apple watchOS
Classification
- Weakness
-
- CWE-787 Out-of-bounds Write
References
-
support.apple.com
/HT211168
release-notes, vendor-advisory
-
support.apple.com
/HT211175
release-notes, vendor-advisory
-
support.apple.com
/HT211169
release-notes, vendor-advisory
-
cisa.gov
/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-9818
government-resource, us-government-resource
Sources
- CVE List CVE-2020-9818
- NVD CVE-2020-9818
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.