CVE-2020-27930 (GCVE-0-2020-27930)
Vulnerability from cvelistv5 – Published: 2020-12-08 20:17 – Updated: 2025-10-21 23:35Summary
A memory corruption issue was addressed with improved input validation. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.1, iOS 12.4.9, watchOS 6.2.9, Security Update 2020-006 High Sierra, Security Update 2020-006 Mojave, iOS 14.2 and iPadOS 14.2, watchOS 5.3.9, macOS Catalina 10.15.7 Supplemental Update, macOS Catalina 10.15.7 Update. Processing a maliciously crafted font may lead to arbitrary code execution.
Severity
7.8 (High)
SSVC
Exploitation: active
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- Processing a maliciously crafted font may lead to arbitrary code execution..
- CWE-787 - Out-of-bounds Write
Assigner
References
11 references
| URL | Tags |
|---|---|
| https://support.apple.com/en-us/HT211931 | x_refsource_MISC |
| https://support.apple.com/en-us/HT211928 | x_refsource_MISC |
| https://support.apple.com/en-us/HT211929 | x_refsource_MISC |
| https://support.apple.com/en-us/HT211940 | x_refsource_MISC |
| https://support.apple.com/en-us/HT211944 | x_refsource_MISC |
| https://support.apple.com/en-us/HT211945 | x_refsource_MISC |
| https://support.apple.com/en-us/HT211946 | x_refsource_MISC |
| https://support.apple.com/en-us/HT211947 | x_refsource_MISC |
| http://seclists.org/fulldisclosure/2020/Dec/32 | mailing-listx_refsource_FULLDISC |
| http://packetstormsecurity.com/files/161294/Apple… | x_refsource_MISC |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
8 products
| Vendor | Product | Version | |
|---|---|---|---|
| Apple | watchOS |
Affected:
unspecified , < 7.1
(custom)
|
|
| Apple | iOS and iPadOS |
Affected:
unspecified , < 14.2
(custom)
|
|
| Apple | macOS |
Affected:
unspecified , < 11.0
(custom)
|
|
| Apple | macOS |
Affected:
unspecified , < 12.4
(custom)
|
|
| Apple | macOS |
Affected:
unspecified , < 6.2
(custom)
|
|
| Apple | macOS |
Affected:
unspecified , < 5.3
(custom)
|
|
| Apple | macOS |
Affected:
unspecified , < 2020
(custom)
|
|
| Apple | macOS |
Affected:
unspecified , < 10.15
(custom)
|
CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 5e9a7a96-a30e-4d33-8fbf-e725edef43df
Exploited: Yes
Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: KEV entry: Apple Multiple Products Memory Corruption Vulnerability | Affected: Apple / Multiple Products | Description: Apple iOS, iPadOS, macOS, and watchOS FontParser contain a memory corruption vulnerability which may allow for code execution when processing maliciously crafted front. | Required action: Apply updates per vendor instructions. | Due date: 2022-05-03 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2020-27930
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-787 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | Multiple Products |
| Due Date | 2022-05-03 |
| Date Added | 2021-11-03 |
| Vendorproject | Apple |
| Vulnerabilityname | Apple Multiple Products Memory Corruption Vulnerability |
| Knownransomwarecampaignuse | Unknown |
References
Created: 2026-02-02 12:28 UTC
| Updated: 2026-02-06 07:17 UTC
KEVintel KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 4e23354b-f709-4c9f-b0b9-7f95c14ece21
Exploited: Yes
Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: KEVIntel entry: A memory corruption issue was addressed with improved input validation. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.1, iOS 12.4.9,... | Affected: Apple / watchOS, iOS and iPadOS, macOS | CVSS: 7.8 (HIGH) | Used in malware: unknown | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: kevintel
Details
| Feed | KEVIntel (kevintel.com) |
|---|---|
| Title | A memory corruption issue was addressed with improved input validation. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.1, iOS 12.4.9,... |
| Vendor | Apple |
| Product | watchOS, iOS and iPadOS, macOS |
| Added Date | 2021-11-03T00:00:00.000Z |
| Cvss Score | 7.8 |
| Epss Score | None |
| Cvss Severity | HIGH |
| Epss Percentile | None |
| Used In Malware | unknown |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | False |
References
Created: 2026-06-19 12:47 UTC
| Updated: 2026-06-19 12:47 UTC
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"id": "CVE-2020-27930",
"lastModified": "2024-11-21T05:22:04.413",
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This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.1, iOS 12.4.9, watchOS 6.2.9, Security Update 2020-006 High Sierra, Security Update 2020-006 Mojave, iOS 14.2 and iPadOS 14.2, watchOS 5.3.9, macOS Catalina 10.15.7 Supplemental Update, macOS Catalina 10.15.7 Update. Processing a maliciously crafted font may lead to arbitrary code execution.\"}]}, \"problemtype\": {\"problemtype_data\": [{\"description\": [{\"lang\": \"eng\", \"value\": \"Processing a maliciously crafted font may lead to arbitrary code execution..\"}]}]}, \"data_version\": \"4.0\", \"CVE_data_meta\": {\"ID\": \"CVE-2020-27930\", \"STATE\": \"PUBLIC\", \"ASSIGNER\": \"product-security@apple.com\"}}}}",
"cveMetadata": "{\"cveId\": \"CVE-2020-27930\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-10-21T23:35:31.914Z\", \"dateReserved\": \"2020-10-27T00:00:00.000Z\", \"assignerOrgId\": \"286789f9-fbc2-4510-9f9a-43facdede74c\", \"datePublished\": \"2020-12-08T20:17:32.000Z\", \"assignerShortName\": \"apple\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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