What is CVE-2025-21042?

CVE-2025-21042 is a high-severity vulnerability in Samsung Android, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2025-09-12.

How severe is CVE-2025-21042?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2025-21042 known to be exploited?

Yes. CVE-2025-21042 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-11-10), indicating it is being actively exploited. 2 public proof-of-concept repositories are indexed.

Buffer overflow in Samsung Android

CVE-2025-21042

Out-of-bounds write in libimagecodec.quram.so prior to SMR Apr-2025 Release 1 allows remote attackers to execute arbitrary code.

Vulnerability class: Buffer Overflow

Published 2025-09-12 · last modified 2026-10-08.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.332 (98.4th percentile), scored 2026-10-18.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 98.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.332 · newest: 0.332 · change: 0.000

Affected products

Samsung Android — versions 13.0, 14.0, 15.0
Samsung Mobile Devices — versions SMR Apr-2025 Release in Android 13, 14, 15

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2025-11-10. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2025-12-01.

Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Public proof-of-concept exploits

References

security.samsungmobile.com/securityUpdate.smsb (Vendor Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (Technical Description, Third Party Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2025-21042?: CVE-2025-21042 is a high-severity vulnerability in Samsung Android, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2025-09-12.
How severe is CVE-2025-21042?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2025-21042 known to be exploited?: Yes. CVE-2025-21042 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-11-10), indicating it is being actively exploited. 2 public proof-of-concept repositories are indexed.