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Severe, 6 weeks1496Projects326

1496 severe, 6 weeks · 326 projects

CiscoCVE-2026-20124

Cisco IOS XE Software: denial of service

Cisco

CVE-2026-20124 · Published Aug 5, 2026 · updated Sep 17, 2026

High7.7
No fix yet
Cisco advisory

A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS XE Software could allow an authenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition.

This vulnerability is due to improper error handling when parsing SNMP requests. This vulnerability affects all versions of SNMP — Versions 1, 2c, and 3. An attacker could exploit this vulnerability by sending a malformed SNMP request to an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly. The attacker must have the SNMPv1 or v2c read-only or read-write community string or valid SNMPv3 user credentials on the affected device.

Affected versions

PackageAffectedFixed in
Cisco IOS XE Software
Product
<= 17.2.1aNo fix yet
<= 3.18.7SPNo fix yet
<= 16.12.1yNo fix yet
<= 16.12.3sNo fix yet
Details and references

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