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High severity · published May 16, 2018
CVE-2018-4850
A vulnerability has been identified in SIMATIC S7-400 (incl
7.5
CVSS
2.4%
EPSS
No
On KEV
Description
A vulnerability has been identified in SIMATIC S7-400 (incl. F) CPU hardware version 4.0 and below (All versions), SIMATIC S7-400 (incl. F) CPU hardware version 5.0 (All firmware versions < V5.2), SIMATIC S7-400H CPU hardware version 4.5 and below (All versions). The affected CPUs improperly validate S7 communication packets which could cause a Denial-of-Service condition of the CPU. The CPU will remain in DEFECT mode until manual restart.
CVSS vector
CVSS:3.0/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)2.4% · higher than 84% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SS
Simatic S7-400 Firmware · Siemens
through 4.0; before 5.2 · source: NVD
SS
Simatic S7-400h Firmware · Siemens
through 4.5 · source: NVD
Affected product
SS
Simatic S7-400 Firmware
Siemens
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-4850
CVE.org
https://www.cve.org/CVERecord?id=CVE-2018-4850
Third Party Advisory
http://www.securityfocus.com/bid/104217
Vendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-914382.pdf
Vendor Advisory
https://www.siemens.com/global/en/home/products/services/cert.html#SecurityPublications
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