CVE-2020-3203

Cisco IOS XE Software Catalyst 9800 Series Wireless Controllers Denial of Service Vulnerability

HIGH

8.6

CVSS Score

Published: June 3, 2020 at 05:40 PM UTC

Updated: June 17, 2026 at 03:17 AM UTC

7 products affected across 1 vendorIOS XeCatalyst 9800-LCatalyst 9800-80

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Severity

HIGH8.6

Exploit prediction

EPSS 0.8%

SSVC

No known exploit

Description

A vulnerability in the locally significant certificate (LSC) provisioning feature of Cisco Catalyst 9800 Series Wireless Controllers that are running Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a memory leak that could lead to a denial of service (DoS) condition. The vulnerability is due to incorrect processing of certain public key infrastructure (PKI) packets. An attacker could exploit this vulnerability by sending crafted Secure Sockets Layer (SSL) packets to an affected device. A successful exploit could cause an affected device to continuously consume memory, which could result in a memory allocation failure that leads to a crash and causes a DoS condition.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

IOS Xe · Cisco

95%

cisco-catalyst-9800-40 (environment) · cisco-catalyst-9800-80 (environment) · cisco-catalyst-9800-cl (environment) · cisco-catalyst-9800-l (environment) · cisco-catalyst-9800-l-c (environment) · cisco-catalyst-9800-l-f (environment)

Catalyst 9800-40 · Ciscodevice

80%

All versions

Catalyst 9800-80 · Ciscodevice

80%

All versions

Catalyst 9800-Cl · Ciscodevice

80%

All versions

Catalyst 9800-L · Ciscodevice

80%

All versions