Security Digest · Vulnerability record · Known exploited
CVE-2025-21043: Samsung Mobile Devices Out-of-Bounds Write Vulnerability
Exploited in the wild (CISA KEV). Out-of-bounds write in libimagecodec.quram.so prior to SMR Sep-2025 Release 1 allows remote attackers to execute arbitrary code.
CISA KEV · added 2025-10-02 CVSS 8.8 High EPSS 2.2% · p82
Should you act?
Exploited: patch now if you run it
CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- Yes, if you run Samsung Mobile Devices. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2025-10-02, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2025-10-23; treat that as the outer limit, not the target.
- EPSS 2.2%, percentile 82: FIRST’s model estimates a 2.2% chance of exploitation activity in the next 30 days, higher than 82% of all scored CVEs (elevated). EPSS is a probability, not a verdict.
- Needs a user to click or open something. Phishing makes that realistic, but it is not wormable.
What it is
Out-of-bounds write in libimagecodec.quram.so prior to SMR Sep-2025 Release 1 allows remote attackers to execute arbitrary code.
CISA’s summary
Samsung mobile devices contain an out-of-bounds write vulnerability in libimagecodec.quram.so which allows remote attackers to execute arbitrary code.
Weakness type: CWE-787.
Product: Samsung Mobile Devices · Assigned by: SamsungMobile · Published: 2025-09-12
Affected and fixed versions
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| Samsung Mobile | Samsung Mobile Devices | see vendor advisory |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| SamsungMobile | 3.1 | 8.8 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Privileges required: none (no login)
- User interaction: required (a user must click/open something)
- Scope: unchanged
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: added 2025-10-02; federal due date 2025-10-23. Known ransomware use: Unknown.
- CISA 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.
- CISA SSVC assessment: exploitation active, automatable no, technical impact total.
- FIRST EPSS (model of 2026-10-21): 2.22% probability of exploitation activity in the next 30 days; percentile 82.
Timeline
- — CVE record published by SamsungMobile
- — Added to CISA’s Known Exploited Vulnerabilities catalog
- — CISA remediation deadline for US federal agencies
- — CVE record last updated
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vendor and project advisories, patches
- Listed in CISA KEV notes (security.samsungmobile.com) security.samsungmobile.com
Vulnerability records
- CVE.org record CVE-2025-21043 cve.org
- NVD entry CVE-2025-21043 nvd.nist.gov
Government
All exploited Samsung vulnerabilities · Today’s Security Digest