Exploited vulnerability · CISA KEV

Is CVE-2025-21042 exploited? Yes: in CISA KEV since 10 Nov 2025

Gociux · Samsung Mobile Devices · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2025-21042, Samsung Mobile Devices Out-of-Bounds Write Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 10 Nov 2025, 59 days after it was published. It affects Samsung Mobile Devices. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 10 Nov 2025

ransomwareNot knownno confirmed use

EPSStop 5%very likely to be exploited

severity8.8CVSS 3.1 · high

US federal due1 Dec 2025BOD 22-01 deadline

What it is

Samsung mobile devices contain an out-of-bounds write vulnerability in libimagecodec.quram.so. This vulnerability could allow remote attackers to execute arbitrary code.

Vendor	Samsung (15 exploited CVEs in KEV)
Product	Mobile Devices
Vulnerability	Samsung Mobile Devices Out-of-Bounds Write Vulnerability
Weakness	CWE-787
Published	12 Sep 2025
Added to KEV	10 Nov 2025
Reported by (CNA)	SamsungMobile

What to do

Check whether you run it. Look for Mobile Devices in your asset inventory, including appliances and cloud images. Stack check lists every exploited Samsung CVE at once.
Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 12 Sep 2025.
Get told next time. Email alerts when CISA adds a CVE for Samsung.

Other exploited CVEs in Mobile Devices

CVE-2025-21043: Samsung Mobile Devices Out-of-Bounds Write Vulnerability (2 Oct 2025)
CVE-2022-22265: Samsung Mobile Devices Use-After-Free Vulnerability (18 Sep 2023)
CVE-2021-25487: Samsung Mobile Devices Out-of-Bounds Read Vulnerability (29 Jun 2023)
CVE-2021-25489: Samsung Mobile Devices Improper Input Validation Vulnerability (29 Jun 2023)
CVE-2021-25394: Samsung Mobile Devices Race Condition Vulnerability (29 Jun 2023)
CVE-2021-25395: Samsung Mobile Devices Race Condition Vulnerability (29 Jun 2023)

References

Questions

Is CVE-2025-21042 being exploited?

Yes. CISA added CVE-2025-21042 to the Known Exploited Vulnerabilities catalog on 10 Nov 2025, which means there is reliable evidence of exploitation in the wild.

Is CVE-2025-21042 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2025-21042?

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check Samsung's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Mobile Devices and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in November 2025 · Samsung scorecard · act-now radar.

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