How severe is CVE-1999-1077?

CVE-1999-1077 has a CVSS 2.0 base score of 4.6, rated medium severity.

Is CVE-1999-1077 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-1077?

CVE-1999-1077 affects Apple Macos. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-1999-1077?

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

When was CVE-1999-1077 published?

CVE-1999-1077 was published on 1999-11-01 and last updated on 2026-06-16.

CVE-1999-1077

CVE-1999-1077 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: 0% (36th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Apple Macos
Published: 1999-11-01
Last modified: 2026-06-16

Description

Idle locking function in MacOS 9 allows local attackers to bypass the password protection of idled sessions via the programmer's switch or CMD-PWR keyboard sequence, which brings up a debugger that the attacker can use to disable the lock.

Frequently asked questions

What is CVE-1999-1077?: Idle locking function in MacOS 9 allows local attackers to bypass the password protection of idled sessions via the programmer's switch or CMD-PWR keyboard sequence, which brings up a debugger that the attacker can use to disable the lock.
How severe is CVE-1999-1077?: CVE-1999-1077 has a CVSS 2.0 base score of 4.6, rated medium severity.
Is CVE-1999-1077 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-1077?: CVE-1999-1077 affects Apple Macos. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-1999-1077?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-1999-1077 published?: CVE-1999-1077 was published on 1999-11-01 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:o:apple:macos:9:*:*:*:*:*:*:*

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