CVE-2020-28393

Name: CVE-2020-28393
Creator: NVD / NIST
Published: 2021-05-12T14:15:11.083+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.63%

Last modified Jun 17, 2026

CVE-2020-28393 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. An unauthenticated remote attacker could create a permanent denial-of-service condition by sending specially crafted OSPF packets. Successful exploitation requires OSPF to be enabled on an affected device on the SCALANCE XM-400, XR-500 (All versions prior to v6.4).. EPSS estimates a 1.63% chance of exploitation in the next 30 days.

Description

An unauthenticated remote attacker could create a permanent denial-of-service condition by sending specially crafted OSPF packets. Successful exploitation requires OSPF to be enabled on an affected device on the SCALANCE XM-400, XR-500 (All versions prior to v6.4).

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.63%

73.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-682

Affected Software

Vendor	Product	Versions
Siemens	Scalance Xm-400 Firmware	< 6.4
Siemens	Scalance Xr524 Firmware	< 6.4
Siemens	Scalance Xr526 Firmware	< 6.4
Siemens	Scalance Xr528 Firmware	< 6.4
Siemens	Scalance Xr552 Firmware	< 6.4
Siemens	Scalance Xm416-4c Firmware	< 6.4
Siemens	Scalance Xm408-8c Firmware	< 6.4
Siemens	Scalance Xm408-4c Firmware	< 6.4
Siemens	Scalance Xm416-4c L3 Firmware	< 6.4
Siemens	Scalance Xm408-8c L3 Firmware	< 6.4
Siemens	Scalance Xm408-4c L3 Firmware	< 6.4

References

https://cert-portal.siemens.com/productcert/pdf/ssa-116379.pdfVendor Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-131-10Third Party Advisory, US Government Resource
https://cert-portal.siemens.com/productcert/pdf/ssa-116379.pdfVendor Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-131-10Third Party Advisory, US Government Resource

Timeline

Published: May 12, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-28393?

How severe is CVE-2020-28393?

CVE-2020-28393 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.63% probability of exploitation in the next 30 days.

How do I fix CVE-2020-28393?

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-2020-28393?

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

Scan your code now

Source: NVD / NIST