CVE-1999-1257

CVE-1999-1257 is a high-severity vulnerability in Xyplex Maxserver Xyplex Terminal Server with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Description

Xyplex terminal server 6.0.1S1, and possibly other versions, allows remote attackers to bypass the password prompt by entering (1) a CTRL-Z character, or (2) a ? (question mark).

Frequently asked questions

What is CVE-1999-1257?
Xyplex terminal server 6.0.1S1, and possibly other versions, allows remote attackers to bypass the password prompt by entering (1) a CTRL-Z character, or (2) a ? (question mark).
How severe is CVE-1999-1257?
CVE-1999-1257 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-1999-1257 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-1257?
CVE-1999-1257 primarily affects Xyplex Maxserver Xyplex Terminal Server. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-1999-1257?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-1999-1257 published?
CVE-1999-1257 was published on 1997-11-26 and last updated on 2026-06-16.

References

Affected products (2)