CVE-2017-20283 NXP CVE debrief

Who should care

Defenders responsible for NXP MQX Classic deployments should assess exposure and verify the version in use to prevent potential denial of service attacks and memory corruption. This includes operators, security teams, and vulnerability management teams that oversee NXP MQX Classic environments and need to prioritize verification and potential updates.

Why it matters

Defenders should prioritize verifying the affected versions of NXP MQX Classic and assessing exposure in their environments due to the potential for denial of service and memory corruption.

• Potential denial of service due to memory corruption
• Possible memory corruption requiring system restart or patching
• Verification of receive buffer length implementation required

Technical summary

The NXP MQX Classic before 5.0 contains an out-of-bounds write vulnerability in the RTCS UDP recvfrom() implementation. Improper enforcement of the application-supplied receive buffer length may allow a crafted UDP packet to overflow the destination buffer, resulting in memory corruption or denial of service. This vulnerability affects NXP MQX Classic deployments and defenders should assess exposure and verify the version in use to prevent potential denial of service attacks and memory corruption. The vulnerability has a CVSS score of 6.5 and a severity of MEDIUM.

Defensive priority

Defenders should prioritize verifying the affected versions of NXP MQX Classic and assessing exposure in their environments.

Recommended defensive actions

• Verify the version of NXP MQX Classic in use and assess exposure
• Review and update the receive buffer length to prevent potential buffer overflows
• Monitor for potential denial of service attacks
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and source item provide limited information about the vulnerability. The NXP MQX Classic before 5.0 contains an out-of-bounds write vulnerability in the RTCS UDP recvfrom() implementation. Evidence is limited to CVE Program and NVD sources. Defenders should verify receive buffer length implementation and assess exposure in their environments.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.