CVE-2020-3422

Cisco IOS XE Software IP Service Level Agreements Denial of Service Vulnerability

HIGH

7.5

CVSS Score

Published: September 24, 2020 at 06:01 PM UTC

Updated: June 17, 2026 at 03:18 AM UTC

30 products affected across 1 vendorIOS XeAsr 1002-xAsr 1006

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Severity

HIGH7.5

Exploit prediction

EPSS 1%

SSVC

No known exploit

Description

A vulnerability in the IP Service Level Agreement (SLA) responder feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause the IP SLA responder to reuse an existing port, resulting in a denial of service (DoS) condition. The vulnerability exists because the IP SLA responder could consume a port that could be used by another feature. An attacker could exploit this vulnerability by sending specific IP SLA control packets to the IP SLA responder on an affected device. The control packets must include the port number that could be used by another configured feature. A successful exploit could allow the attacker to cause an in-use port to be consumed by the IP SLA responder, impacting the feature that was using the port and resulting in a DoS condition.

Affected

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

IOS Xe · Cisco

95%

16.9.3

cisco-1100-integrated-services-router (environment) · cisco-1101-integrated-services-router (environment) · cisco-1109-integrated-services-router (environment) · cisco-1111x-integrated-services-router (environment) · cisco-111x-integrated-services-router (environment) · cisco-1120-integrated-services-router (environment) · cisco-1160-integrated-services-router (environment) · cisco-4221-integrated-services-router (environment) · cisco-4331-integrated-services-router (environment) · cisco-4431-integrated-services-router (environment) · cisco-4461-integrated-services-router (environment) · cisco-asr-1001-hx (environment) · cisco-asr-1001-x (environment) · cisco-asr-1002-hx (environment) · cisco-asr-1002-x (environment) · cisco-asr-1004 (environment) · cisco-asr-1006 (environment) · cisco-asr-1006-x (environment) · cisco-asr-1009-x (environment) · cisco-asr-1013 (environment) · cisco-catalyst-3650 (environment) · cisco-catalyst-3850 (environment) · cisco-catalyst-9200 (environment) · cisco-catalyst-9300 (environment) · cisco-catalyst-9400 (environment) · cisco-catalyst-9500 (environment) · cisco-catalyst-9600 (environment) · cisco-catalyst-9800 (environment) · cisco-csr-1000v (environment)

1100 Integrated Services Router · Ciscodevice

80%

All versions

1101 Integrated Services Router · Ciscodevice

80%

All versions

1109 Integrated Services Router · Ciscodevice

80%

All versions

1111X Integrated Services Router · Ciscodevice

80%

All versions