CVE-1999-0416

Cisco 7xx Series Routers - Denial of Service via TELNET TCP Connection

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-1999-0416. PoCs published by Tiz.Telesup.

AI-analyzed exploit summary This exploit targets a denial-of-service vulnerability in Cisco 760 Series Routers by overwhelming the device with approximately 98 connections to port 23 (telnet). The code establishes multiple non-blocking sockets and sends a minimal payload to trigger a reboot.

Description

Vulnerability in Cisco 7xx series routers allows a remote attacker to cause a system reload via a TCP connection to the router's TELNET port.

Exploits (1)

exploitdb WORKING POC VERIFIED
by Tiz.Telesup · cdoshardware
https://www.exploit-db.com/exploits/19919

This exploit targets a denial-of-service vulnerability in Cisco 760 Series Routers by overwhelming the device with approximately 98 connections to port 23 (telnet). The code establishes multiple non-blocking sockets and sends a minimal payload to trigger a reboot.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: Cisco 760 Series Routers
No auth needed
Prerequisites: Network access to the target router · Telnet port (23) accessible
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (2)

Core 2
Core References
Vendor Advisory vendor-advisory x_refsource_cisco
http://www.cisco.com/warp/public/770/7xxconn-pub.shtml
Various Sources third-party-advisory government-resource x_refsource_ciac
http://ciac.llnl.gov/ciac/bulletins/j-034.shtml

Scores

EPSS 0.0342
EPSS Percentile 87.4%

Details

Status published
Products (1)
cisco/cisco_7xx_routers
Published Mar 11, 1999
Tracked Since Feb 18, 2026