VulnTideExploited vulnerabilities, by vendor. Data as of 28 Oct 2026.
Known exploitedIn CISA's KEV catalog since 3 November 2021Ransomware use: unknown
Apple Multiple Products

CVE-2020-27930: Apple Multiple Products Memory Corruption Vulnerability

Is it exploited?

Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 3 Nov 2021, 330 days after the CVE record was published.

How likely is exploitation in the next 30 days?
22%

EPSS score, percentile 97.7 of all scored records

How severe?
7.8 High

CVSS v3.1 base score, from CISA's enrichment of the record

What should I do?

Required action (CISA), due 3 May 2022: Apply updates per vendor instructions.

The CVE record links no vendor advisory, patch or mitigation.

Which versions are affected?

Affected: before 7.1; before 14.2; before 11.0; before 12.4; before 6.2; before 5.3; before 2020; before 10.15

Versions by product

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: 3 May 2022.

Advisories and patches

The CVE record links no vendor advisory, patch or mitigation.

Linked from CISA's catalog entry

Affected products and versions

As listed in the CVE record.

Apple watchOS
StatusVersions
Affectedbefore 7.1
Apple iOS and iPadOS
StatusVersions
Affectedbefore 14.2
Apple macOS
StatusVersions
Affectedbefore 11.0
Apple macOS
StatusVersions
Affectedbefore 12.4
Apple macOS
StatusVersions
Affectedbefore 6.2
Apple macOS
StatusVersions
Affectedbefore 5.3
Apple macOS
StatusVersions
Affectedbefore 2020
Apple macOS
StatusVersions
Affectedbefore 10.15

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, macOS, and watchOS FontParser contain a memory corruption vulnerability which may allow for code execution when processing maliciously crafted front.

Summary: CISA's KEV catalog, as of 28 Oct 2026.

  • CISA added CVE-2020-27930 to its Known Exploited Vulnerabilities (KEV) catalog on 3 Nov 2021.
  • 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 3 May 2022.
  • The CVE record was published on 8 Dec 2020, 330 days before it was added to KEV.
  • The CVE record carries a CVSS v3.1 base score of 7.8 (High), taken from CISA's enrichment of the record.
  • FIRST's EPSS model puts the probability of exploitation in the next 30 days at 22% (percentile 97.7), as of 28 Oct 2026.
  • CISA's SSVC assessment in the CVE record: exploitation active, automatable no, technical impact total.

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

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.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

Weakness

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.

Timeline

DateEvent
8 Dec 2020CVE record published
3 Nov 2021Added to CISA KEV
3 May 2022CISA due date for the required action
21 Oct 2025CVE record last updated

References

More exploited Apple vulnerabilities

  • CVE-2026-86950: Apple Multiple Products Out-of-Bounds Write Vulnerability (added 29 Sep 2026)
  • CVE-2026-65400: Apple macOS Improper Authentication Vulnerability (added 18 Aug 2026)
  • CVE-2025-31277: Apple Multiple Products Buffer Overflow Vulnerability (added 20 Mar 2026)
  • CVE-2025-43510: Apple Multiple Products Improper Locking Vulnerability (added 20 Mar 2026)
  • CVE-2025-43520: Apple Multiple Products Classic Buffer Overflow Vulnerability (added 20 Mar 2026)
  • CVE-2021-30952: Apple Multiple Products Integer Overflow or Wraparound Vulnerability (added 5 Mar 2026)