CVE-2020-9819

MEDIUMNVD 4.39.0▲Trending — 4 sources updated this weekExploited in the wild

4.3

A memory consumption issue was addressed with improved memory handling. This issue is fixed in iOS 13.5 and iPadOS 13.5, iOS 12.4.7, watchOS 6.2.5, watchOS 5.3.7. Processing a maliciously crafted mail message may lead to heap corruption.

CVSS v3: 4.3
EG Score: 9.0(high)
EPSS: 70.0%
KEV: ⚠ Exploited

Published

June 9, 2020

Last Modified

October 23, 2025

References (9)

product-security@applehttps://support.apple.com/HT211168
product-security@applehttps://support.apple.com/HT211169
product-security@applehttps://support.apple.com/HT211175
product-security@applehttps://support.apple.com/HT211176
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/HT211168
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/HT211169
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/HT211175
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/HT211176
134c704f-9b21-4f2e-91b3-4a467353bcc0https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-9819

Weakness Classification(2)

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

Data Freshness Timeline

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

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-10 05:54 UTCEG score recompute
2026-06-10 05:54 UTCGHSA enrichment
2026-06-10 01:50 UTCEG score recompute
2026-06-10 01:50 UTCGHSA enrichment
2026-06-09 21:47 UTCEG score recompute
2026-06-09 21:47 UTCGHSA enrichment
2026-06-09 18:42 UTCCISA KEV update
2026-06-09 17:43 UTCEG score recompute
2026-06-09 17:43 UTCGHSA enrichment
2026-06-09 17:12 UTCCISA KEV update
2026-06-09 13:40 UTCEG score recompute
2026-06-09 13:40 UTCGHSA enrichment
2026-06-09 09:36 UTCEG score recompute
2026-06-09 09:36 UTCGHSA enrichment
2026-06-09 05:33 UTCEG score recompute
2026-06-09 05:33 UTCGHSA enrichment
2026-06-09 01:29 UTCEG score recompute
2026-06-09 01:29 UTCGHSA enrichment
2026-06-08 21:25 UTCEG score recompute
2026-06-08 21:25 UTCGHSA enrichment

Frequently asked(6)

What is CVE-2020-9819?

CVE-2020-9819 is a medium vulnerability published on June 9, 2020. A memory consumption issue was addressed with improved memory handling. This issue is fixed in iOS 13.5 and iPadOS 13.5, iOS 12.4.7, watchOS 6.2.5, watchOS 5.3.7. Processing a maliciously crafted mail message may lead to heap corruption.

When was CVE-2020-9819 disclosed?

CVE-2020-9819 was first published in the National Vulnerability Database on June 9, 2020, with the most recent update on October 23, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2020-9819 actively exploited?

Yes. CISA added CVE-2020-9819 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting Apple iOS, iPadOS, and watchOS. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.

What is the CVSS score of CVE-2020-9819?

CVE-2020-9819 has a CVSS v3 base score of 4.3 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.

Which products are affected by CVE-2020-9819?

CVE-2020-9819 affects Apple iOS, iPadOS, and watchOS. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.

How do I remediate CVE-2020-9819?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-9819, 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.

Dependency Blast Radius

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CVE-2020-9819

📅 Published

🔄 Last Modified

🔗 References (9)

Weakness Classification(2)

Data Freshness Timeline

❓ Frequently asked(6)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2020-9819?

🔗 Related CVEs(same CWE)

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Published

Last Modified

References (9)

Frequently asked(6)

Related CVEs(same CWE)