Back
CVE-2020-3909
A buffer overflow was addressed with improved bounds checking. This issue is fixed in iOS 13.4 and iPadOS 13.4, macOS Catalina 10.15.4,…
Critical9.8EPSS 3.0%
- Published
- Updated
- Reserved
- Assigned by
- apple
Description
A buffer overflow was addressed with improved bounds checking. 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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 3.0% · top 12% of all CVEs (6 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Weakness
- Multiple issues in libxml2
- CWE-120 (opens in a new tab)All about CWE-120 and its CVEs
Affected products
- affected unspecified – < iOS 13.4 and iPadOS 13.4
- affected unspecified – < macOS Catalina 10.15.4
- affected unspecified – < tvOS 13.4
- affected unspecified – < watchOS 6.2
- affected unspecified – < iTunes for Windows 12.10.5
- affected unspecified – < iCloud for Windows 10.9.3
Apple · iCloud for Windows (Legacy)
- affected unspecified – < iCloud for Windows 7.18
References (8)
- https://support.apple.com/HT211100 (opens in a new tab)x_refsource_MISCx_transferred
- https://support.apple.com/HT211102 (opens in a new tab)x_refsource_MISCx_transferred
- https://support.apple.com/HT211101 (opens in a new tab)x_refsource_MISCx_transferred
- https://support.apple.com/HT211103 (opens in a new tab)x_refsource_MISCx_transferred
- https://support.apple.com/HT211105 (opens in a new tab)x_refsource_MISCx_transferred
- https://support.apple.com/HT211106 (opens in a new tab)x_refsource_MISCx_transferred
- https://support.apple.com/HT211107 (opens in a new tab)x_refsource_MISCx_transferred
- https://www.oracle.com/security-alerts/cpuoct2020.html (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2020-3909)Record last updated .