CVE-2025-51824Network attack vector

Heap memory corruption via overlong USART device name

Published Aug 11, 2025 · Updated Aug 11, 2025

A heap buffer overflow in libcsp 2.0 allows attackers to overwrite memory when a Zephyr USART device name exceeds 11 characters. The csp_usart_open function copies conf->device into the 11-byte ctx->name field with strcpy, without validating or limiting the input length. Exploitation requires an overlong configuration value; public sources do not establish how attackers control that value or the resulting application-level consequence.

CVSS severity6.5
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A heap buffer overflow in libcsp 2.0 allows attackers to overwrite memory when a Zephyr USART device name exceeds 11 characters. The csp_usart_open function copies conf->device into the 11-byte ctx->name field with strcpy, without validating or limiting the input length. Exploitation requires an overlong configuration value; public sources do not establish how attackers control that value or the resulting application-level consequence.

The record

CVE
CVE-2025-51824
Published
Aug 11, 2025
Updated
Aug 11, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 11, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N

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.

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No observations available

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

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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