How severe is CVE-2025-9557?

CVE-2025-9557 has a CVSS 3.x base score of 7.6, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability high.

Is CVE-2025-9557 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-9557?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-9557 have an EU (EUVD) identifier?

Yes. CVE-2025-9557 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-199711.

When was CVE-2025-9557 published?

CVE-2025-9557 was published on 2025-11-26 and last updated on 2026-06-17.

CVE-2025-9557

CVE-2025-9557 is a high-severity vulnerability with a CVSS 3.x base score of 7.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-120.

Key facts

Severity: High (CVSS 3.x base score 7.6)
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-199711
Weakness: CWE-120
Published: 2025-11-26
Last modified: 2026-06-17

Description

‭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.‬

Frequently asked questions

What is CVE-2025-9557?: ‭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.‬
How severe is CVE-2025-9557?: CVE-2025-9557 has a CVSS 3.x base score of 7.6, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability high.
Is CVE-2025-9557 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-9557?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-9557 have an EU (EUVD) identifier?: Yes. CVE-2025-9557 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-199711.
When was CVE-2025-9557 published?: CVE-2025-9557 was published on 2025-11-26 and last updated on 2026-06-17.

References

https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-r3j3-c5v7-2ppf

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