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High severity · published May 12, 2021
CVE-2020-28393
An unauthenticated remote attacker could create a permanent denial-of-service condition by sending specially crafted OSPF packets
7.5
CVSS
1.6%
EPSS
No
On KEV
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).
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.6% · higher than 76% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SX
Scalance Xm-400 Firmware · Siemens
before 6.4 · source: NVD
SX
Scalance Xm408-4c Firmware · Siemens
before 6.4 · source: NVD
SX
Scalance Xm408-4c L3 Firmware · Siemens
before 6.4 · source: NVD
SX
Scalance Xm408-8c Firmware · Siemens
before 6.4 · source: NVD
SX
Scalance Xm408-8c L3 Firmware · Siemens
before 6.4 · source: NVD
SX
Scalance Xm416-4c Firmware · Siemens
before 6.4 · source: NVD
SX
Scalance Xm416-4c L3 Firmware · Siemens
before 6.4 · source: NVD
SX
Scalance Xr524 Firmware · Siemens
before 6.4 · source: NVD
SX
Scalance Xr526 Firmware · Siemens
before 6.4 · source: NVD
SX
Scalance Xr528 Firmware · Siemens
before 6.4 · source: NVD
SX
Scalance Xr552 Firmware · Siemens
before 6.4 · source: NVD
Affected product
SX
Scalance Xm-400 Firmware
Siemens
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-28393
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-28393
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
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