What’s Vulnerable › Vulnerabilities

CVE-2021-29998

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-04-13 · updated 2026-06-17
• Weakness: CWE-787

Description

An issue was discovered in Wind River VxWorks before 6.5. There is a possible heap overflow in dhcp client.

Affected products

• Siemens Ruggedcom Win Subscriber Station Firmware: all versions
• Siemens Scalance X200-4 P Irt Firmware: all versions
• Siemens Scalance X201-3P Irt Firmware: all versions
• Siemens Scalance X201-3P Irt Pro Firmware: all versions
• Siemens Scalance X202-2 Irt Firmware: all versions
• Siemens Scalance X202-2P Irt Firmware: all versions
• Siemens Scalance X202-2P Irt Pro Firmware: all versions
• Siemens Scalance X204-2 Firmware: all versions
• Siemens Scalance X204-2Fm Firmware: all versions
• Siemens Scalance X204-2Ld Firmware: all versions
• Siemens Scalance X204-2Ld Ts Firmware: all versions
• Siemens Scalance X204-2Ts Firmware: all versions
• Siemens Scalance X204 Irt Firmware: all versions
• Siemens Scalance X204 Irt Pro Firmware: all versions
• Siemens Scalance X206-1 Firmware: all versions
• Siemens Scalance X206-1Ld Firmware: all versions
• Siemens Scalance X208 Firmware: all versions
• Siemens Scalance X208 Pro Firmware: all versions
• Siemens Scalance X212-2 Firmware: all versions
• Siemens Scalance X212-2Ld Firmware: all versions
• Siemens Scalance X216 Firmware: all versions
• Siemens Scalance X224 Firmware: all versions
• Siemens Scalance X300 Firmware: all versions
• Siemens Scalance X408 Firmware: all versions
• Siemens Scalance Xf201-3P Irt Firmware: all versions
• Siemens Scalance Xf202-2P Irt Firmware: all versions
• Siemens Scalance Xf204-2 Firmware: all versions
• Siemens Scalance Xf204-2Ba Irt Firmware: all versions
• Siemens Scalance Xf204 Firmware: all versions
• Siemens Scalance Xf204 Irt Firmware: all versions

How to fix

Upgrade to a fixed version: Siemens Sinamics Perfect Harmony Gh180 Firmware 2022; Windriver Vxworks 6.5. Check the vendor advisory for mitigations.

References

• https://cert-portal.siemens.com/productcert/pdf/ssa-560465.pdf
• https://cert-portal.siemens.com/productcert/pdf/ssa-910883.pdf
• https://support2.windriver.com/index.php?page=security-notices
• https://us-cert.cisa.gov/ics/advisories/icsa-21-194-12
• https://cert-portal.siemens.com/productcert/pdf/ssa-560465.pdf
• https://cert-portal.siemens.com/productcert/pdf/ssa-910883.pdf
• https://support2.windriver.com/index.php?page=security-notices
• https://us-cert.cisa.gov/ics/advisories/icsa-21-194-12

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