CVE-2020-9943

MEDIUMNVD 5.55.5—

5.5

An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.0, tvOS 14.0, iOS 14.0 and iPadOS 14.0. A malicious application may be able to read restricted memory.

CVSS v3: 5.5
EG Score: 5.5(medium)
EPSS: 53.9%
KEV: Not listed

Published

December 8, 2020

Last Modified

November 21, 2024

References (14)

product-security@applehttp://seclists.org/fulldisclosure/2020/Dec/26
product-security@applehttp://seclists.org/fulldisclosure/2020/Dec/32
product-security@applehttps://support.apple.com/en-us/HT211843
product-security@applehttps://support.apple.com/en-us/HT211844
product-security@applehttps://support.apple.com/en-us/HT211850
product-security@applehttps://support.apple.com/en-us/HT211931
product-security@applehttps://support.apple.com/kb/HT212011
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/fulldisclosure/2020/Dec/26
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/fulldisclosure/2020/Dec/32
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/en-us/HT211843
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/en-us/HT211844
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/en-us/HT211850
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/en-us/HT211931
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/kb/HT212011

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-125Out-of-bounds Read

Data Freshness Timeline

(refreshed 14× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-06 13:46 UTCepss_batch
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2026-06-05 22:45 UTCepss_batch
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2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
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2026-05-27 13:39 UTCepss_batch

Frequently asked(5)

What is CVE-2020-9943?

CVE-2020-9943 is a medium vulnerability published on December 8, 2020. An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.0, tvOS 14.0, iOS 14.0 and iPadOS 14.0. A malicious application may be able to read restricted memory.

When was CVE-2020-9943 disclosed?

CVE-2020-9943 was first published in the National Vulnerability Database on December 8, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2020-9943 actively exploited?

CVE-2020-9943 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 53.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2020-9943?

CVE-2020-9943 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2020-9943?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-9943, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-2020-9943

📅 Published

🔄 Last Modified

🔗 References (14)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2020-9943?

🔗 Related CVEs(same CWE)

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Published

Last Modified

References (14)

Frequently asked(5)

Related CVEs(same CWE)