Cisco has warned users of a potential denial of service risk involving its popular Catalyst LAN switches.
A buffer overflow vulnerability in Telnet option handling can be used to crash the process and force a Catalyst switch to reload. This operation could be repeated by an attacker to produce a denial of service attack.
Cisco Catalyst switches, series 4000, 5000 and 6000 and also 2948G and 2900 models, running CatOS are affected by the flaw, which Cisco warns has already been exploited. Other Cisco LAN switches and routers are immune.
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