CVE-2020-3258

Name: CVE-2020-3258
Creator: NVD / NIST
Published: 2020-06-03T18:15:21.997+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 4.65%

Last modified Jun 17, 2026

CVE-2020-3258 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Multiple vulnerabilities in Cisco IOS Software for Cisco 809 and 829 Industrial Integrated Services Routers (Industrial ISRs) and Cisco 1000 Series Connected Grid Routers (CGR1000) could allow an unauthenticated, remote attacker or an authenticated, local attacker to execute arbitrary code on an affected system or cause an affected system to crash and reload. For more information about these vulnerabilities, see the Details section of this advisory.. EPSS estimates a 4.65% chance of exploitation in the next 30 days.

Description

Multiple vulnerabilities in Cisco IOS Software for Cisco 809 and 829 Industrial Integrated Services Routers (Industrial ISRs) and Cisco 1000 Series Connected Grid Routers (CGR1000) could allow an unauthenticated, remote attacker or an authenticated, local attacker to execute arbitrary code on an affected system or cause an affected system to crash and reload. For more information about these vulnerabilities, see the Details section of this advisory.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

4.65%

90.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-119

Affected Software

Vendor	Product	Versions
Cisco	Ios	15.8\(3\)m2
Cisco	Ios	15.8\(9\)
Cisco	Ios	15.9

References

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-iot-rce-xYRSeMNHPatch, Vendor Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-iot-rce-xYRSeMNHPatch, Vendor Advisory

Timeline

Published: Jun 3, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-3258?

How severe is CVE-2020-3258?

CVE-2020-3258 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 4.65% probability of exploitation in the next 30 days.

How do I fix CVE-2020-3258?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-3258?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST