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CVE-2025-6693· NVD / CVE Program· CNA VulDB

RT-Thread device.c sys_device_write memory corruption

A vulnerability, which was classified as critical, was found in RT-Thread up to 5.1.0. This affects the function sys_device_open/sys_device_read/sys_device_control/sys_device_init/sys_device_close/sys_device_write of the file components/drivers/core/device.c. The manipulation leads to memory corruption. It is possible to launch the attack on the local host. The vendor was contacted early about this disclosure but did not respond in any way.

HighCVSS 8.5 · v4.0—No exploit No fix recorded
Published
Jun 26, 2025
Updated
Jun 17, 2026
EPSS
0.3% · 19th percentile
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Report tools

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Action score

34

Monitor

Low priority for now.

CVSS
34 / 40 · 8.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · VulDB
8.5
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
rt-threadrt-thread

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • rt-thread rt-threadup to 5.1.0 inclusive

Versions reported by the vendor

Affected version ranges reported by the assigning authority (VulDB). Independent of NVD's CPE analysis and usually ahead of it.

  • n/a RT-Thread

    • 5.0, 5.1.0affected

Same product

rt-thread: all records

Other highest-scoring records for the same primary product.

  • CVE-2024-25393A stack buffer overflow occurs in net/at/src/at_server.c in RT-Thread through 5.0.2.
    39Monitor
  • CVE-2024-25395A buffer overflow occurs in utilities/rt-link/src/rtlink.c in RT-Thread through 5.0.2.
    35Monitor
  • CVE-2025-5869RT-Thread lwp_syscall.c sys_recvfrom memory corruption
    34Monitor
  • CVE-2025-5868RT-Thread lwp_syscall.c sys_thread_sigprocmask array index
    34Monitor
  • CVE-2025-5867RT-Thread lwp_syscall.c csys_sendto null pointer dereference
    34Monitor
  • CVE-2025-5866RT-Thread lwp_syscall.c sys_sigprocmask array index
    34Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2025-586517 days apartRT-Thread Parameter lwp_syscall.c sys_select memory corruption
    34Monitor
  • CVE-2025-586617 days apartRT-Thread lwp_syscall.c sys_sigprocmask array index
    34Monitor
  • CVE-2025-586817 days apartRT-Thread lwp_syscall.c sys_thread_sigprocmask array index
    34Monitor
  • CVE-2025-586917 days apartRT-Thread lwp_syscall.c sys_recvfrom memory corruption
    34Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
X

Weakness class (CWE)

CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer

CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records