CVE-2020-3200

Cisco IOS and IOS XE Software Secure Shell Denial of Service Vulnerability

HIGH
7.7
CVSS Score
Published: June 3, 2020 at 05:45 PM UTC
Updated: June 17, 2026 at 03:17 AM UTC
2 products affected across 1 vendorIOSIOS Xe

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Severity
HIGH7.7
Exploit prediction
EPSS 2%
SSVC
No known exploit

Description

A vulnerability in the Secure Shell (SSH) server code of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, remote attacker to cause an affected device to reload. The vulnerability is due to an internal state not being represented correctly in the SSH state machine, which leads to an unexpected behavior. An attacker could exploit this vulnerability by creating an SSH connection to an affected device and using a specific traffic pattern that causes an error condition within that connection. A successful exploit could allow an attacker to cause the device to reload, resulting in a denial of service (DoS) condition.

Affected

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

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16.1.116.1.216.1.316.10.116.10.1a16.10.1b16.10.1c16.10.1d16.10.1e16.10.1f16.10.1g16.10.1s16.10.216.11.116.11.1a16.11.1b16.11.1c16.11.1s16.11.216.12.1y16.2.116.2.216.3.116.3.1a16.3.216.3.316.3.416.3.516.3.5b16.3.616.3.716.3.816.3.916.4.116.4.216.4.316.5.116.5.1a16.5.1b16.5.216.5.316.6.116.6.216.6.316.6.416.6.4a16.6.4s16.6.516.6.5a16.6.5b16.6.616.7.116.7.1a16.7.1b16.7.216.7.316.7.416.8.116.8.1a16.8.1b16.8.1c16.8.1d16.8.1e16.8.1s16.8.216.8.316.9.116.9.1a16.9.1b16.9.1c16.9.1d16.9.1s16.9.216.9.2a16.9.2s16.9.316.9.3a16.9.3h16.9.3s3.10.0ce3.10.0e3.10.0s3.10.10s3.10.1ae3.10.1e3.10.1s3.10.1se3.10.2as3.10.2e3.10.2s3.10.2ts3.10.3e3.10.3s3.10.4s3.10.5s3.10.6s3.10.7s3.10.8as3.10.8s3.10.9s3.11.0e3.11.0s3.11.1ae3.11.1e3.11.1s3.11.2s3.11.3s3.11.4s3.12.0as3.12.0s3.12.1s3.12.2s3.12.3s3.12.4s3.13.0as3.13.0s3.13.10s3.13.1s3.13.2as3.13.2s3.13.3s3.13.4s3.13.5as3.13.5s3.13.6as3.13.6bs3.13.6s3.13.7as3.13.7s3.13.8s3.13.9s3.14.0s3.14.1s3.14.2s3.14.3s3.14.4s3.15.0s3.15.1cs3.15.1s3.15.2s3.15.3s3.15.4s3.16.0as3.16.0bs3.16.0cs3.16.0s3.16.10s3.16.1as3.16.1s3.16.2as3.16.2bs3.16.2s3.16.3as3.16.3s3.16.4as3.16.4bs3.16.4cs3.16.4ds3.16.4es3.16.4gs3.16.4s3.16.5as3.16.5bs3.16.5s3.16.6bs3.16.6s3.16.7as3.16.7bs3.16.7s3.16.8s3.16.9s3.17.0s3.17.1as3.17.1s3.17.2s3.17.3s3.17.4s3.18.0as3.18.0s3.18.0sp3.18.1asp3.18.1bsp3.18.1csp3.18.1gsp3.18.1hsp3.18.1isp3.18.1s3.18.1sp3.18.2asp3.18.2s3.18.2sp3.18.3asp3.18.3bsp3.18.3s3.18.3sp3.18.4s3.18.4sp3.18.5sp3.18.6sp3.18.7sp3.2.0se3.2.1se3.2.2se3.2.3se3.3.0se3.3.0sg3.3.0xo3.3.1se3.3.1sg3.3.1xo3.3.2se3.3.2sg3.3.2xo3.3.3se3.3.4se3.3.5se3.4.0sg3.4.1sg3.4.2sg3.4.3sg3.4.4sg3.4.5sg3.4.6sg3.4.7sg3.4.8sg3.5.0e3.5.1e3.5.2e3.5.3e3.6.0ae3.6.0be3.6.0e3.6.10e3.6.1e3.6.2ae3.6.3e3.6.4e3.6.5ae3.6.5be3.6.5e3.6.6e3.6.7ae3.6.7be3.6.7e3.6.8e3.6.9ae3.6.9e3.7.0bs3.7.0e3.7.0s3.7.1as3.7.1e3.7.1s3.7.2e3.7.2s3.7.2ts3.7.3e3.7.3s3.7.4as3.7.4e3.7.4s3.7.5e3.7.5s3.7.6s3.7.7s3.7.8s3.8.0e3.8.0s3.8.1e3.8.1s3.8.2e3.8.2s3.8.3e3.8.4e3.8.5ae3.8.5e3.8.6e3.8.7e3.8.8e3.8.9e3.9.0as3.9.0e3.9.0s3.9.1as3.9.1e3.9.1s3.9.2be3.9.2e3.9.2s

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-371CWE-436

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