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CVSS: 5.0EPSS: 1%CPEs: 11EXPL: 1

The vty layer in Quagga before 0.96.4, and Zebra 0.93b and earlier, does not verify that sub-negotiation is taking place when processing the SE marker, which allows remote attackers to cause a denial of service (crash) via a malformed telnet command to the telnet CLI port, which may trigger a null dereference. La capa vty en Quagga anteriores a 0.96.4, y Zebra anteriores a 0.91, no verifica si se está llevando a cabo una sub-negociación cuando procesa el marcador SE, lo que permite a atacantes remotos causar una denegación de servicio (caída) mediante un comando telnet malformado al puerto telnet CLI, lo que puede disparar una desreferencia de memoria nula. • https://www.exploit-db.com/exploits/23375 http://marc.info/?l=bugtraq&m=106883387304266&w=2 http://secunia.com/advisories/10563 http://www.debian.org/security/2004/dsa-415 http://www.redhat.com/support/errata/RHSA-2003-305.html http://www.redhat.com/support/errata/RHSA-2003-307.html https://access.redhat.com/security/cve/CVE-2003-0795 https://bugzilla.redhat.com/show_bug.cgi?id=1617088 • CWE-20: Improper Input Validation •