ZDF
Sign inSign up

Vulnerabilities

Vulnerability · CVE-2025-9557

‭An out-of-bound write can lead to an arbitrary code execution.

Published Nov 26, 2025 · catalog updated Oct 13, 2026 · Zephyr

Last checked Nov 5, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-9557. EPSS is 0.22%. Act only if a listed version of Zephyr is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High7.6
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.22%
Remediation
Version ranges on file
Affected products
vendor zephyrproject-rtos Zephyr * <4.2.2

‭An out-of-bound write can lead to an arbitrary code execution. Even on devices with some form of memory protection, this can still lead to‬ ‭a crash and a resultant denial of service.‬

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor zephyrproject-rtos Zephyr * <4.2.2* <4.2.2

How to fix CVE-2025-9557

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-9557. EPSS is 0.22%. Act only if a listed version of Zephyr is installed.

Which versions are affected?

Compare what you have installed with zephyrproject-rtos Zephyr * <4.2.2 * <4.2.2. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.22%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Nov 26, 2025 · EUVD

    Detected

    ‭An out-of-bound write can lead to an arbitrary code execution. Even on devices with some form of memory protection, this can still lead to‬ ‭a crash and a resultant denial of service.‬

  2. Oct 13, 2026 · EUVD

    Updated

    ‭An out-of-bound write can lead to an arbitrary code execution. Even on devices with some form of memory protection, this can still lead to‬ ‭a crash and a resultant denial of service.‬

Sources

  • CVE.orgVulnerability recordCVE-2025-9557

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-9557

    30-day exploitation probability 0.22%

    first.org
  • EUVDVulnerability recordEUVD-2025-199711

    ‭An out-of-bound write can lead to an arbitrary code execution. Even on devices with some form of memory protection, this can still lead to‬ ‭a crash and a resultant denial of service.‬

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 5, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 5, 2026
  • CVE.orgOct 26, 2026
  • EUVDOct 26, 2026