EUVD-2025-17438Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A06:2021 - Vulnerable and Outdated Components
ASVS 5.0
V15 - Secure Coding and Architecture Bounds checking, buffer size validation
MITRE ATT&CK
2 techniques across 2 tactics: Execution, Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS 8.0. EPSS 0.4%. Public PoC/exploit available. No patch confirmed. |
| Exploit ScenarioDerived | An attacker could exploit this vulnerability in A vulnerability classified as critical to compromise the security of affected deployments, potentially impacting confidentiality, integrity, or availability. |
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Alert meAnalysisAIv1 – Mar 14, 2026
A security vulnerability in A vulnerability classified as critical (CVSS 8.0). Risk factors: public PoC available.
Earlier versions of this analysis (1)
A vulnerability classified as critical has been found in RT-Thread 5.1.0. This affects the function sys_sigprocmask of the file rt-thread/components/lwp/lwp_syscall.c. The manipulation of the argument
RemediationAI
Monitor vendor channels for patch availability. Consider network segmentation to limit exposure if patching is delayed.
Affected VersionsENISA
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in euvd
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
CWE-119 (Buffer Overflow). CVSS 8.0 indicates high severity. Affects A vulnerability classified as critical.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
Lifecycle Timeline
2DescriptionCVE.org
A vulnerability classified as critical has been found in RT-Thread 5.1.0. This affects the function sys_sigprocmask of the file rt-thread/components/lwp/lwp_syscall.c. The manipulation of the argument how leads to improper validation of array index.
Executive ViewAI
RT-Thread 5.1.0 contains a high-severity vulnerability (CVE-2025-5866) in signal processing that allows attackers to exploit improper input validation, potentially leading to system compromise or denial of service. Organizations running RT-Thread 5.1.0 in production embedded systems or IoT environments face immediate risk of exploitation, as public exploits are already available and no vendor patch exists.
Implement network segmentation to restrict access to affected RT-Thread systems; disable signal processing features if not critical to application functionality; apply input validation filters at application layer to restrict 'how' parameter values; monitor system logs for suspicious sigprocmask calls; consider runtime application self-protection (RASP) or kernel-level syscall filtering; maintain isolated test environments to validate any interim patches from RT-Thread community; evaluate vendor patch timeline and plan upgrade schedule accordingly.
Threat Intelligence Overview
NVD
CVE.org
EPSS
GitHub
VulDB
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Privilege escalation occurs when an attacker leverages flaws in access control mechanisms to gain permissions beyond what they were originally granted.
A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.
Critical memory corruption vulnerability in RT-Thread 5.1.0's sys_select syscall handler that allows authenticated local
Critical null pointer dereference vulnerability in RT-Thread 5.1.0's lwp_syscall.c csys_sendto function, allowing authen
Critical memory corruption vulnerability in RT-Thread 5.1.0's sys_recvfrom syscall handler that allows authenticated loc
Critical array index validation vulnerability in RT-Thread 5.1.0's signal mask syscall handler that allows authenticated
A vulnerability, which was classified as critical, was found in RT-Thread up to 5.1.0. This affects the function sys_dev
Stack-based buffer overflow in RT-Thread RTOS (versions up to and including 5.0.2) affects the CAN_Receive function with
Stack-based buffer overflow in RT-Thread RTOS (versions up to and including 5.0.2) affects the recvmsg function within t
A stack buffer overflow occurs in net/at/src/at_server.c in RT-Thread through 5.0.2. Rated critical severity (CVSS 9.8),
Memory corruption in RT-Thread's Linux-compatible process (lwp) syscall layer allows a local low-privileged user to cras
A vulnerability classified as problematic was found in RT-Thread up to 5.1.0. Rated medium severity (CVSS 4.8), this vul
A buffer overflow occurs in utilities/rt-link/src/rtlink.c in RT-Thread through 5.0.2. Rated high severity (CVSS 8.8), t
A stack buffer overflow occurs in libc/posix/ipc/mqueue.c in RT-Thread through 5.0.2. Rated high severity (CVSS 8.4), th
Exploit-DB