CVE-2025-5869

Privilege escalation via unvalidated recvfrom pointer

Published Jun 9, 2025 · Updated Jun 9, 2025

Memory corruption in RT-Thread 5.1.0 allows local users to overwrite kernel memory through a crafted sys_recvfrom from pointer. The syscall passes the user-supplied pointer to sockaddr_tomusl, which performs memcpy after only a null check and never validates the destination as user memory. An unprivileged user process must invoke the syscall; a successful write can corrupt kernel state, escalate privileges, or crash the device.

CVSS severity9.8
Critical
EPSS probability0.92%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in RT-Thread 5.1.0 allows local users to overwrite kernel memory through a crafted sys_recvfrom from pointer. The syscall passes the user-supplied pointer to sockaddr_tomusl, which performs memcpy after only a null check and never validates the destination as user memory. An unprivileged user process must invoke the syscall; a successful write can corrupt kernel state, escalate privileges, or crash the device.

The record

CVE
CVE-2025-5869
Published
Jun 9, 2025
Updated
Jun 9, 2025
Vendor
RT-Thread
Product
RT-Thread
Classifications
CWE-119, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 9, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.1.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

RT-Thread · RT-Threadversion=5.1.0

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.6VulDBCVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7.7VulDBAV:A/AC:L/Au:S/C:C/I:C/A:C
8.0VulDBCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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