CVE-2020-9934: Apple iOS, iPadOS, and macOS Input Validation Vulnerability
- Is it exploited?
Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 8 Sep 2022, 692 days after the CVE record was published.
- How likely is exploitation in the next 30 days?
- 3.2%
EPSS score, percentile 88.1 of all scored records
- How severe?
- 5.5 Medium
CVSS v3.1 base score, from CISA's enrichment of the record
- What should I do?
CISA deadline 29 Sep 2022. Apply updates per vendor instructions.
The CVE record links no vendor advisory, patch or mitigation.
- Which versions are affected?
Affected
- before iOS 13.6 and iPadOS 13.6
- before macOS Catalina 10.15.6
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
What to do
Required action, set by CISA
Apply updates per vendor instructions.
CISA due date for this action: 29 September 2022.
Advisories and patches
The CVE record links no vendor advisory, patch or mitigation.
Linked from CISA's catalog entry
- https://support.apple.com/en-us/HT211288
- https://support.apple.com/en-us/HT211289
- https://nvd.nist.gov/vuln/detail/CVE-2020-9934
Affected products and versions
As listed in the CVE record.
| Status | Versions |
|---|---|
| Affected | before iOS 13.6 and iPadOS 13.6 |
| Status | Versions |
|---|---|
| Affected | before macOS Catalina 10.15.6 |
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
About this vulnerability
Apple iOS, iPadOS, and macOS contain an unspecified vulnerability involving input validation which can allow a local attacker to view sensitive user information.
Summary: CISA's KEV catalog, as of 28 Oct 2026.
- CISA added CVE-2020-9934 to its Known Exploited Vulnerabilities (KEV) catalog on 8 Sep 2022.
- CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
- The due date CISA sets for the required action is 29 Sep 2022.
- The CVE record was published on 16 Oct 2020, 692 days before it was added to KEV.
- The CVE record carries a CVSS v3.1 base score of 5.5 (Medium), taken from CISA's enrichment of the record.
- FIRST's EPSS model puts the probability of exploitation in the next 30 days at 3.2% (percentile 88.1), as of 28 Oct 2026.
- CISA's SSVC assessment in the CVE record: exploitation active, automatable no, technical impact partial.
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.
Description
An issue existed in the handling of environment variables. This issue was addressed with improved validation. This issue is fixed in iOS 13.6 and iPadOS 13.6, macOS Catalina 10.15.6. A local user may be able to view sensitive user information.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
Timeline
| Date | Event |
|---|---|
| 16 Oct 2020 | CVE record published |
| 8 Sep 2022 | Added to CISA KEV |
| 29 Sep 2022 | CISA due date for the required action |
| 21 Oct 2025 | CVE record last updated |
References
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