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CVE-2025-21042

9.8, critical Known exploited

Samsung Mobile Devices Out-of-Bounds Write Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
9.8, critical critical CVSS v3.1
EPSS, next 30 days
33% higher than 98.3% of scored CVEs
Exploitation
Confirmed in the wild
Published
12 Sept 2025a year ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 10 Nov 2025. US federal agencies had to remediate by 1 Dec 2025, a deadline that has passed.

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.

Description

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

Details

Vendor
Samsung
Product
Samsung Mobile Devices
Weakness
CWE-787 (opens in a new tab)
Status
Analyzed
Updated
8 Oct 2026
Assigner
mobile.security@samsung.com

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References 3

Advisories 2

Other references 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Samsung CVEs

Every Samsung CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2025-21043 Samsung Mobile Devices Out-of-Bounds Write Vulnerability KEV EPSS 2% 9.8, critical
  • CVE-2025-4632 Samsung MagicINFO 9 Server Path Traversal Vulnerability KEV EPSS 24% 9.8, critical
  • CVE-2024-7399 Samsung MagicINFO 9 Server Path Traversal Vulnerability KEV EPSS 92% 9.8, critical
  • CVE-2023-21492 Samsung Mobile Devices Insertion of Sensitive Information Into Log File Vulnerability KEV EPSS 3% 4.4, medium
  • CVE-2022-22265 Samsung Mobile Devices Use-After-Free Vulnerability KEV EPSS 0.4% 7.8, high
  • CVE-2021-25487 Samsung Mobile Devices Out-of-Bounds Read Vulnerability KEV EPSS 0.6% 7.8, high
  • CVE-2021-25489 Samsung Mobile Devices Improper Input Validation Vulnerability KEV EPSS 0.5% 5.5, medium
  • CVE-2021-25394 Samsung Mobile Devices Race Condition Vulnerability KEV EPSS 0.4% 6.4, medium

Beyond this page

Is CVE-2025-21042 in your network?

This page tells you how dangerous CVE-2025-21042 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2025-21042 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2025-21042 comes with the devices to patch.

    Learn more about EXYS7600 OCELOT

  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.