CVE-2025-21042Known exploitationPublic exploitNetwork attack vector

Remote code execution via malformed DNG images

Published Sep 12, 2025 · Updated Feb 26, 2026

Out-of-bounds write in libimagecodec.quram.so on Samsung Mobile Devices before SMR Apr-2025 Release 1 allows remote attackers to execute code. The image-processing library fails to validate malformed DNG data before writing outside its intended buffer. Successful exploitation requires processing an attacker-supplied image; observed LANDFALL samples delivered spyware and enabled surveillance.

CVSS severity8.8
High
EPSS probability33.17%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in libimagecodec.quram.so on Samsung Mobile Devices before SMR Apr-2025 Release 1 allows remote attackers to execute code. The image-processing library fails to validate malformed DNG data before writing outside its intended buffer. Successful exploitation requires processing an attacker-supplied image; observed LANDFALL samples delivered spyware and enabled surveillance.

The record

CVE
CVE-2025-21042
Published
Sep 12, 2025
Updated
Feb 26, 2026
Vendor
Samsung Electronics Co., Ltd.
Product
Samsung Mobile Devices
Classifications
CWE-787, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 23, 2024Exploitation reportedLANDFALL spyware campaign exploitation
  2. Sep 12, 2025CVE publishedPublication date reported by the CVE source.
  3. Feb 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Samsung Electronics Co., Ltd. · Samsung Mobile DevicesAffected versions are unavailable in this record.

Published CVSS scores

8.8GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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