What is CVE-2025-51824?

CVE-2025-51824 is a medium-severity vulnerability in Libcsp, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 6.5/10. Published 2025-08-11.

How severe is CVE-2025-51824?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Is CVE-2025-51824 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Libcsp

CVE-2025-51824

libcsp 2.0 is vulnerable to Buffer Overflow in the csp_usart_open() function at drivers/usart/zephyr.c.

Vulnerability class: Buffer Overflow

Published 2025-08-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N.

EPSS exploit prediction

EPSS: 0.003 (16.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 16.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Libcsp — versions 2.0

Weakness classification (CWE)

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

Public proof-of-concept exploits

References

github.com/libcsp/libcsp/issues/851 (Issue Tracking)
github.com/libcsp/libcsp/pull/853 (Patch)

Frequently asked questions

What is CVE-2025-51824?: CVE-2025-51824 is a medium-severity vulnerability in Libcsp, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 6.5/10. Published 2025-08-11.
How severe is CVE-2025-51824?: Medium severity. CVSS v3 base score is 6.5 out of 10.
Is CVE-2025-51824 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.