CVE-2025-43521

MEDIUMNVD 5.55.5—

5.5

A downgrade issue affecting Intel-based Mac computers was addressed with additional code-signing restrictions. This issue is fixed in macOS Sequoia 15.7.3, macOS Tahoe 26.2. An app may be able to access sensitive user data.

CVSS v3: 5.5
EG Score: 5.5(medium)
EPSS: 0.6%
KEV: Not listed

Published

December 12, 2025

Last Modified

April 2, 2026

References (2)

product-security@applehttps://support.apple.com/en-us/125886
product-security@applehttps://support.apple.com/en-us/125887

Weakness Classification(1)

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

CWE-347Improper Verification of Cryptographic Signature

Data Freshness Timeline

(refreshed 10× 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.

2026-06-02 20:12 UTCepss_batch
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2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch

Frequently asked(5)

What is CVE-2025-43521?

CVE-2025-43521 is a medium vulnerability published on December 12, 2025. A downgrade issue affecting Intel-based Mac computers was addressed with additional code-signing restrictions. This issue is fixed in macOS Sequoia 15.7.3, macOS Tahoe 26.2. An app may be able to access sensitive user data.

When was CVE-2025-43521 disclosed?

CVE-2025-43521 was first published in the National Vulnerability Database on December 12, 2025, with the most recent update on April 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2025-43521 actively exploited?

CVE-2025-43521 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2025-43521?

CVE-2025-43521 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2025-43521?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-43521, 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-2025-43521

📅 Published

🔄 Last Modified

🔗 References (2)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2025-43521?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (2)

Frequently asked(5)

Related CVEs(same CWE)