What’s Vulnerable › Vulnerabilities

CVE-2020-28400

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-07-13 · updated 2026-06-17
• Weakness: CWE-770

Description

Affected devices contain a vulnerability that allows an unauthenticated attacker to trigger a denial of service condition. The vulnerability can be triggered if a large amount of DCP reset packets are sent to the device.

Affected products

• Siemens Dk Standard Ethernet Controller Evaluation Kit Firmware: all versions
• Siemens Ek-Ertec 200 Evaulation Kit Firmware: all versions
• Siemens Ek-Ertec 200P Evaluation Kit Firmware: before 4.7 — fixed in 4.7
• Siemens Ruggedcom Rm1224 Firmware: before 6.4 — fixed in 6.4
• Siemens Scalance M-800 Firmware: before 6.4 — fixed in 6.4
• Siemens Scalance S615 Firmware: before 6.4 — fixed in 6.4
• Siemens Scalance W1700 Firmware: all versions
• Siemens Scalance W700 Firmware: all versions
• Siemens Scalance X200-4 P Irt Firmware: before 5.5.0 — fixed in 5.5.0
• Siemens Scalance X201-3P Irt Firmware: before 5.5.0 — fixed in 5.5.0
• Siemens Scalance X201-3P Irt Pro Firmware: before 5.5.0 — fixed in 5.5.0
• Siemens Scalance X202-2 Irt Firmware: before 5.5.0 — fixed in 5.5.0
• Siemens Scalance X202-2P Irt Pro Firmware: before 5.5.0 — fixed in 5.5.0
• Siemens Scalance X204-2 Firmware: before 5.2.5 — fixed in 5.2.5
• Siemens Scalance X204-2Fm Firmware: before 5.2.5 — fixed in 5.2.5
• Siemens Scalance X204-2Ld Firmware: before 5.2.5 — fixed in 5.2.5
• Siemens Scalance X204-2Ld Ts Firmware: before 5.2.5 — fixed in 5.2.5
• Siemens Scalance X204-2Ts Firmware: before 5.2.5 — fixed in 5.2.5
• Siemens Scalance X204 Irt Firmware: before 5.5.0 — fixed in 5.5.0
• Siemens Scalance X204 Irt Pro Firmware: before 5.5.0 — fixed in 5.5.0
• Siemens Scalance X206-1 Firmware: before 5.2.5 — fixed in 5.2.5
• Siemens Scalance X206-1Ld Firmware: before 5.2.5 — fixed in 5.2.5
• Siemens Scalance X208 Firmware: before 5.2.5 — fixed in 5.2.5
• Siemens Scalance X208Pro Firmware: before 5.2.5 — fixed in 5.2.5
• Siemens Scalance X212-2 Firmware: before 5.2.5 — fixed in 5.2.5
• Siemens Scalance X212-2Ld Firmware: before 5.2.5 — fixed in 5.2.5
• Siemens Scalance X216 Firmware: before 5.2.5 — fixed in 5.2.5
• Siemens Scalance X224 Firmware: before 5.2.5 — fixed in 5.2.5
• Siemens Scalance X302-7Eec Firmware: all versions
• Siemens Scalance X304-2Fe Firmware: all versions

How to fix

Upgrade to a fixed version: Siemens Ek-Ertec 200P Evaluation Kit Firmware 4.7; Siemens Ruggedcom Rm1224 Firmware 6.4; Siemens Scalance M-800 Firmware 6.4; Siemens Scalance S615 Firmware 6.4; Siemens Scalance X200-4 P Irt Firmware 5.5.0; Siemens Scalance X201-3P Irt Firmware 5.5.0; Siemens Scalance X201-3P Irt Pro Firmware 5.5.0; Siemens Scalance X202-2 Irt Firmware 5.5.0; Siemens Scalance X202-2P Irt Pro Firmware 5.5.0; Siemens Scalance X204-2 Firmware 5.2.5; Siemens Scalance X204-2Fm Firmware 5.2.5; Siemens Scalance X204-2Ld Firmware 5.2.5. Check the vendor advisory for mitigations.

References

• https://cert-portal.siemens.com/productcert/html/ssa-599968.html
• https://cert-portal.siemens.com/productcert/pdf/ssa-599968.pdf
• https://us-cert.cisa.gov/ics/advisories/icsa-21-194-03
• https://cert-portal.siemens.com/productcert/html/ssa-599968.html
• https://cert-portal.siemens.com/productcert/pdf/ssa-599968.pdf
• https://us-cert.cisa.gov/ics/advisories/icsa-21-194-03

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