How severe is CVE-1999-1543?

CVE-1999-1543 has a CVSS 2.0 base score of 4.6, rated medium severity.

Is CVE-1999-1543 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-1543?

CVE-1999-1543 primarily affects Apple Macos. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-1999-1543?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-1999-1543 published?

CVE-1999-1543 was published on 1999-07-10 and last updated on 2026-06-16.

CVE-1999-1543

CVE-1999-1543 is a medium-severity vulnerability in Apple Macos with a CVSS 2.0 base score of 4.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 2.0 base score 4.6)
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Apple Macos
Published: 1999-07-10
Last modified: 2026-06-16

Description

MacOS uses weak encryption for passwords that are stored in the Users & Groups Data File.

Frequently asked questions

What is CVE-1999-1543?: MacOS uses weak encryption for passwords that are stored in the Users & Groups Data File.
How severe is CVE-1999-1543?: CVE-1999-1543 has a CVSS 2.0 base score of 4.6, rated medium severity.
Is CVE-1999-1543 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-1543?: CVE-1999-1543 primarily affects Apple Macos. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-1999-1543?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-1999-1543 published?: CVE-1999-1543 was published on 1999-07-10 and last updated on 2026-06-16.

References

Affected products (7)

cpe:2.3:o:apple:macos:7.5.3:*:*:*:*:*:*:*
cpe:2.3:o:apple:macos:7.6:*:*:*:*:*:*:*
cpe:2.3:o:apple:macos:7.6.1:*:*:*:*:*:*:*
cpe:2.3:o:apple:macos:8.0:*:*:*:*:*:*:*
cpe:2.3:o:apple:macos:8.1:*:*:*:*:*:*:*
cpe:2.3:o:apple:macos:8.5:*:*:*:*:*:*:*
cpe:2.3:o:apple:macos:8.6:*:*:*:*:*:*:*

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