Is CVE-2020-3200 being actively exploited?

CVE-2020-3200 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2020-3200?

CVE-2020-3200 has a CVSS 3.1 base score of 7.7 (HIGH).

CVE-2020-3200

HIGH · CVSS 7.7EPSS 1.7%EU EUVD

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.

Key facts

CVSS score: 7.7 (v3.1)
Severity: HIGH
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Weakness (CWE): CWE-371
EPSS score: 1.7% (77th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2020-24471)
Published: June 3, 2020
NVD last modified: June 17, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2020-24471 in the EU Vulnerability Database. Last updated in EUVD on November 15, 2024.

View on the EU Vulnerability Database

Affected products

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and 950 more…

Certified products that may be affected

6 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Cisco Catalyst 3K/4K Wired Access Switches running IOS-XE 3.8.0E - Cisco Systems, Inc. - Common Criteria CCEVS-VR-VID-10688-2016 - archived
Cisco Aggregation Services Router (ASR) 1000 Series, IOS XE 3.13 - Cisco Systems, Inc. - Common Criteria CCEVS-VR-VID-10609-2015 - archived
Cisco Integrated Services Router 4400 Series (ISR-4400), IOS XE 3.13.0 - Cisco Systems, Inc. - Common Criteria CCEVS-VR-VID-10600-2015 - archived
Cisco Catalyst 3850 Series Switches running IOS-XE 3.6.0E and Catalyst 6500 Series Switches running IOS 15.1(2)SY3 - Cisco Systems, Inc. - Common Criteria NSCIB-CC-14-39582-CR - archived
Cisco Integrated Services Routers Series (ISR-4400), IOS XE 3.10.2tS - Cisco Systems, Inc. - Common Criteria CCEVS-VR-VID-10553-2014 - archived

See all 6 in the Security Certifications Explorer.

References

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ssh-dos-Un22sd2A(Patch, Vendor Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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