CVE-2025-9558: zephyrproject-rtos zephyr Classic Buffer Overflow
CVSS: 7.6v3.1HighDeferred
Published 26-11-2025Last modified 13-10-2026
Vulnerability summary
CVE-2025-9558 is a high (CVSS 7.6) Classic Buffer Overflow vulnerability in zephyrproject-rtos zephyr. EPSS estimates a 0.19% chance of exploitation in the next 30 days, higher than 8% of scored vulnerabilities.
CVSS score
7.6/10
010
High · v3.1 (CVE.org)EPSS score
0.19%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 26-11-2025PublishedVulnerability first disclosed.
- 13-10-2026Last modifiedVulnerability information updated.
Description
There is a potential OOB Write vulnerability in the gen_prov_start function in pb_adv.c. The full length of the received data is copied into the link.rx.buf receiver buffer without any validation on the data size.
CVSS metrics
2 scores · 2 sources · 1 versionHigh 7.6Preferred score · CVE.org (CNA)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:HSourcesAll 2 agree
- NVDNIST7.6HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
EPSS trend
Probability
0.19%
Chance of exploitation in the next 30 days
Percentile
8%
Versus all other CVEs
30-day change
0.00 pp
From 0.19% on 21-09-2026
21-09-202621-10-2026
EPSS score0.19%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Zephyrproject-rtos1 product
- zephyr< 4.2.2
1 vendor · 1 product