CVE-2020-27950 (GCVE-0-2020-27950)
Vulnerability from cvelistv5 – Published: 2020-12-08 20:17 – Updated: 2025-10-21 23:35Summary
A memory initialization issue was addressed. 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. A malicious application may be able to disclose kernel memory.
Severity
5.5 (Medium)
SSVC
Exploitation: active
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-01-29 17:35 UTC
CWE
- A malicious application may be able to disclose kernel memory..
- CWE-665 - Improper Initialization
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/161296/XNU-K… | 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
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 8f291fe7-93ed-4a02-875b-118159eae9c8
Exploited: Yes
Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: Apple Multiple Products Memory Initialization Vulnerability | Affected: Apple / Multiple Products | Description: Apple iOS, iPadOS, macOS, and watchOS contain a memory initialization vulnerability that may allow a malicious application to disclose kernel memory. | 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-2020-27950
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-665 |
|---|---|
| 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 Initialization Vulnerability |
| Knownransomwarecampaignuse | Unknown |
References
Created: 2026-10-02 08:10 CEST
| Updated: 2026-10-02 08:10 CEST
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 28b29114-bfc8-4f07-afad-59d42d9785bb
Exploited: Yes
Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: A memory initialization issue was addressed. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.1, iOS 12.4.9, watchOS 6.2.9, Security Update... | Affected: Apple / watchOS, iOS and iPadOS, macOS | CVSS: 5.5 (MEDIUM) | EPSS: 0.1652 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: previdian
Details
| Feed | Previdian (previdian.com) |
|---|---|
| Title | A memory initialization issue was addressed. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.1, iOS 12.4.9, watchOS 6.2.9, Security Update... |
| Cve Id | CVE-2020-27950 |
| Vendor | Apple |
| Ghsa Id | None |
| Product | watchOS, iOS and iPadOS, macOS |
| Added Date | 2021-11-03T00:00:00.000Z |
| Cvss Score | 5.5 |
| Epss Score | 0.1652 |
| Previous Ids | |
| Cvss Severity | MEDIUM |
| Virtual Patch | False |
| Cvss Estimated | False |
| Epss Percentile | 0.96907 |
| Used In Malware | unknown |
| Vulnerability Id | CVE-2020-27950 |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | False |
References
Created: 2026-10-02 09:10 CEST
| Updated: 2026-10-02 09:10 CEST
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Loading…
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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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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