CVE-2021-29998

Name: CVE-2021-29998
Creator: NVD / NIST
Published: 2021-04-13T17:15:12.31+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.37%

Last modified Jun 17, 2026

CVE-2021-29998 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An issue was discovered in Wind River VxWorks before 6.5. There is a possible heap overflow in dhcp client.. EPSS estimates a 2.37% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

2.37%

81.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Windriver	Vxworks	< 6.5
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 Irt Firmware	All versions
Siemens	Scalance X204 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 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 Firmware	All versions
Siemens	Scalance Xf204 Irt Firmware	All versions
Siemens	Scalance Xf204-2 Firmware	All versions
Siemens	Scalance Xf204-2ba Irt Firmware	All versions
Siemens	Scalance Xf206-1 Firmware	All versions
Siemens	Scalance Xf208 Firmware	All versions
Siemens	Simatic Rf 181 Eip Firmware	All versions
Siemens	Simatic Rf 182c Firmware	All versions
Siemens	Sinamics Perfect Harmony Gh180 Firmware	>= 2015, < 2022

References

https://cert-portal.siemens.com/productcert/pdf/ssa-560465.pdfThird Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-910883.pdfThird Party Advisory
https://support2.windriver.com/index.php?page=security-noticesVendor Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-194-12Third Party Advisory, US Government Resource
https://cert-portal.siemens.com/productcert/pdf/ssa-560465.pdfThird Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-910883.pdfThird Party Advisory
https://support2.windriver.com/index.php?page=security-noticesVendor Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-194-12Third Party Advisory, US Government Resource

Timeline

Published: Apr 13, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-29998?

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

How severe is CVE-2021-29998?

CVE-2021-29998 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.37% probability of exploitation in the next 30 days.

How do I fix CVE-2021-29998?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-29998?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST