CVE-2020-28393

moderate-risk
Published 2021-05-12

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).

Do I need to act?

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0.43% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.5/10 High
NETWORK / LOW complexity

Affected Products (11)

Scalance Xm-400 Firmware
Scalance Xr524 Firmware
Scalance Xr526 Firmware
Scalance Xr528 Firmware
Scalance Xr552 Firmware
Scalance Xm416-4C Firmware
Scalance Xm408-8C Firmware
Scalance Xm408-4C Firmware
Scalance Xm416-4C L3 Firmware
Scalance Xm408-8C L3 Firmware
Scalance Xm408-4C L3 Firmware

Affected Vendors

Siemens

References (4)

Vendor Advisory https://cert-portal.siemens.com/productcert/pdf/ssa-116379.pdf
Third Party Advisory https://us-cert.cisa.gov/ics/advisories/icsa-21-131-10
Vendor Advisory https://cert-portal.siemens.com/productcert/pdf/ssa-116379.pdf
Third Party Advisory https://us-cert.cisa.gov/ics/advisories/icsa-21-131-10
44
/ 100
moderate-risk
Severity 26/34 · High
Exploitability 2/34 · Minimal
Exposure 16/34 · Moderate