How severe is CVE-1999-1559?

CVE-1999-1559 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-1999-1559 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-1559?

CVE-1999-1559 affects Alcatel Omniswitch. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-1999-1559?

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

When was CVE-1999-1559 published?

CVE-1999-1559 was published on 1999-03-31 and last updated on 2026-06-16.

CVE-1999-1559

CVE-1999-1559 is a medium-severity vulnerability in Alcatel Omniswitch with a CVSS 2.0 base score of 5.0. 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 5.0)
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Alcatel Omniswitch
Published: 1999-03-31
Last modified: 2026-06-16

Description

Xylan OmniSwitch before 3.2.6 allows remote attackers to bypass the login prompt via a CTRL-D (control d) character, which locks other users out of the switch because it only supports one session at a time.

Frequently asked questions

What is CVE-1999-1559?: Xylan OmniSwitch before 3.2.6 allows remote attackers to bypass the login prompt via a CTRL-D (control d) character, which locks other users out of the switch because it only supports one session at a time.
How severe is CVE-1999-1559?: CVE-1999-1559 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-1999-1559 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-1559?: CVE-1999-1559 affects Alcatel Omniswitch. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-1999-1559?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-1999-1559 published?: CVE-1999-1559 was published on 1999-03-31 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:h:alcatel:omniswitch:*:*:*:*:*:*:*:*

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