CVE-2016-20009

Name: CVE-2016-20009
Creator: NVD / NIST
Published: 2021-03-11T22:15:12.12+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.89%

Last modified Jun 17, 2026

CVE-2016-20009 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A DNS client stack-based buffer overflow in ipdnsc_decode_name() affects Wind River VxWorks 6.5 through 7. NOTE: This vulnerability only affects products that are no longer supported by the maintainer. EPSS estimates a 1.89% chance of exploitation in the next 30 days.

Description

A DNS client stack-based buffer overflow in ipdnsc_decode_name() affects Wind River VxWorks 6.5 through 7. NOTE: This vulnerability only affects products that are no longer supported by the maintainer

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

1.89%

77.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Windriver	Vxworks	>= 6.5, <= 7.0
Siemens	Sgt-100 Firmware	All versions
Siemens	Sgt-200 Firmware	All versions
Siemens	Sgt-300 Firmware	All versions
Siemens	Sgt-400 Firmware	All versions
Siemens	Sgt-A20 Firmware	All versions
Siemens	Sgt-A35 Firmware	All versions
Siemens	Sgt-A65 Firmware	All versions

References

https://blog.exodusintel.com/2016/08/09/vxworks-execute-my-packets/Exploit, Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-553445.pdfThird Party Advisory
https://blog.exodusintel.com/2016/08/09/vxworks-execute-my-packets/Exploit, Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-553445.pdfThird Party Advisory

Timeline

Published: Mar 11, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2016-20009?

How severe is CVE-2016-20009?

CVE-2016-20009 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.89% probability of exploitation in the next 30 days.

How do I fix CVE-2016-20009?

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-2016-20009?

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

Scan your code now

Source: NVD / NIST