---
title: "CVE-2025-21042: Samsung Mobile Devices Out-of-Bounds Write Vulnerability"
url: https://erroneo.us/security/cve/CVE-2025-21042/
description: "CVE-2025-21042 (Samsung Mobile Devices): Exploited in the wild (CISA KEV). Out-of-bounds write in libimagecodec.quram.so prior to SMR Apr-2025 Release 1…"
type: vulnerability-record
section: "Security Digest"
date_published: 2025-09-12
date_modified: 2026-10-07
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2025-21042"
kev: true
cvss: 8.8
epss: 0.34549
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2025-21042: Samsung Mobile Devices Out-of-Bounds Write Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Samsung Mobile Devices. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2025-11-10, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2025-12-01 ; treat that as the outer limit, not the target.
- EPSS 34.5% , percentile 98: FIRST’s model estimates a 34.5% chance of exploitation activity in the next 30 days, higher than 98% of all scored CVEs (very high). 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 Apr-2025 Release 1 allows remote attackers to execute arbitrary code.

## Affected products (CVE record)

- Samsung Mobile Samsung Mobile Devices: see advisory

## Severity

- SamsungMobile CVSS 3.1: 8.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: added 2025-11-10; federal due date 2025-12-01. 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): 34.55% probability of exploitation activity in the next 30 days; percentile 98.

## Sources

- [Listed in CISA KEV notes (security.samsungmobile.com)](https://security.samsungmobile.com/securityUpdate.smsb?year=2025&month=04)
- [CVE.org record CVE-2025-21042](https://www.cve.org/CVERecord?id=CVE-2025-21042)
- [NVD entry CVE-2025-21042](https://nvd.nist.gov/vuln/detail/CVE-2025-21042)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-21042)
- [unit42.paloaltonetworks.com](https://unit42.paloaltonetworks.com/landfall-is-new-commercial-grade-android-spyware/)

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Source page: https://erroneo.us/security/cve/CVE-2025-21042/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt