CVE-2020-3910
A buffer overflow was addressed with improved size validation.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.64%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
A buffer overflow was addressed with improved size validation. This issue is fixed in iOS 13.4 and iPadOS 13.4, macOS Catalina 10.15.4, tvOS 13.4, watchOS 6.2, iTunes for Windows 12.10.5, iCloud for Windows 10.9.3, iCloud for Windows 7.18. Multiple issues in libxml2.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 1.64% probability · 76th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-120
- Affected
- apple/icloud · apple/itunes · apple/ipados · apple/iphone os · apple/mac os x · apple/tvos · apple/watchos
- Source
- product-security@apple.com
EPSS 1.6% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://support.apple.com/HT211100Vendor Advisory
- https://support.apple.com/HT211101Vendor Advisory
- https://support.apple.com/HT211102Vendor Advisory
- https://support.apple.com/HT211103Vendor Advisory
- https://support.apple.com/HT211105Vendor Advisory
- https://support.apple.com/HT211106Vendor Advisory
- https://support.apple.com/HT211107Vendor Advisory
- https://support.apple.com/HT211100Vendor Advisory
- https://support.apple.com/HT211101Vendor Advisory
- https://support.apple.com/HT211102Vendor Advisory
- https://support.apple.com/HT211103Vendor Advisory
- https://support.apple.com/HT211105Vendor Advisory
- https://support.apple.com/HT211106Vendor Advisory
- https://support.apple.com/HT211107Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.