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5.0
CVE-1999-1559: Xylan OmniSwitch before 3.2.6 lets attackers skip login and lock out users
CVE-1999-1559 · published 27 years ago
Summary
The OmniSwitch network switch (versions before 3.2.6) can be tricked by sending a special control character, allowing someone to get past the login screen. Because the device only supports one active session, the attacker’s entry also blocks legitimate users from connecting. Update the switch to version 3.2.6 or later, or apply the vendor’s recommended patch, to stop this behavior.
What to do
The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.
Affected software
| Vendor | Product | Affected versions |
|---|---|---|
| alcatel | omniswitch |
<= 3.2.4 cpe:2.3:h:alcatel:omniswitch:*:*:*:*:*:*:*:* |
Original advisory text
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 a...
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.
Internet-facing
14 days
Internal
60 days
- Not known to be exploited
- Can be exploited automatically (estimated)
- Gives an attacker partial control (estimated)
Severity
5.0
Medium
Timeline
Published31 Mar 1999
Updated3 Nov 2026
First seen29 Sep 2026
Sources
CVE-1999-1559 · NVD
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