CVE-2025-47869: Apache NuttX RTOS: examples/xmlrpc: Fix calls buffers size.

[Tomasz Cedro <cederom () apache org>]

Severity: low 

Affected versions:

- Apache NuttX RTOS 6.22 before 12.9.0

Description:

Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability was discovered in Apache NuttX 
RTOS apps/exapmles/xmlrpc application. In this example application device stats structure that stored remotely provided 
parameters had hardcoded buffer size which could lead to buffer overflow. Structure members buffers were updated to 
valid size of CONFIG_XMLRPC_STRINGSIZE+1.

This issue affects Apache NuttX RTOS users that may have used or base their code on example application as presented in 
releases from 6.22 before 12.9.0.

Users of XMLRPC in Apache NuttX RTOS are advised to review their code 
for this pattern and update buffer sizes as presented in the version of 
the example in release 12.9.0.

Credit:

Chánh Phạm <chanhphamviet () gmail com> (reporter)
Arnout Engelen <engelen () apache org> (remediation developer)
Tomek CEDRO <tomek () cedro info> (coordinator)
Alan Carvalho de Assis <acassis () gmail com> (remediation reviewer)
Alin Jerpelea <jerpelea () gmail com> (remediation reviewer)
Lee, Lup Yuen <luppy () appkaki com> (remediation reviewer)
Xiang Xiao <xiaoxiang781216 () gmail com> (remediation reviewer)
JianyuWang <wangjianyu3 () xiaomi com> (remediation reviewer)

References:

https://github.com/apache/nuttx-apps/pull/3027
https://nuttx.apache.org
https://www.cve.org/CVERecord?id=CVE-2025-47869