Threats / Samsung / CVE-2021-25337
CVE-2021-25337
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-09-19
Samsung Mobile Devices vulnerability
Samsung mobile devices contain an improper access control vulnerability in the clipboard service that allows untrusted applications to read or write arbitrary files. The vulnerability was exploited in the wild and chained with other CVEs.
Verdict
Today item — known-exploited.
Improper access control in Samsung mobile clipboard service enables unauthorized file access by untrusted applications. Exploitation observed in wild; chaining with additional vulnerabilities increases attack surface and potential impact.
CISA KEV Yes · 2022-11-085EPSS 0.02807 (verify live)6CVSS 4.43CISA SSVC Exploitation: active · Automatable: no · Impact: partial4
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
2 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-11-08).
Probability (EPSS)
EPSS 0.02807 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
CVSS 4.4 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N) · Affected: Samsung, Mobile Devices. Confirm exact fixed builds in the vendor advisory.CVSS — CNA-assigned (CVE.org), version 3.1, set at disclosure.
Weakness (CWE)
Mapped to CWE-269 Improper Privilege Management — weakness family: Authorization / access control.CWE — CNA-assigned (CVE.org); the weakness class drives how the flaw is exploited.
CISA SSVC (triage disposition)
Exploitation: active · Automatable: no · Technical Impact: partialCISA's own stakeholder-specific triage inputs, published in the CVE record (CISA Coordinator role). NOTE: this is CISA's three decision points; the final Act/Attend/Track decision also requires a Mission & Well-being input not published here, so no overall decision is asserted.
Currency of the record
CISA added this to its KEV catalog 614 days after the CVE record was published.KEV lag = CISA-KEV dateAdded − CVE.org datePublished; a floor on how long the known-exploited flaw sat in the public record before the federal catalog listed it. Severity/weakness here is CNA- or CISA-assigned (current at disclosure), independent of NVD's analysis backlog.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I install a malicious application on a Samsung mobile device that requests minimal permissions.
Business
User device security is compromised through a supply chain or app store distribution vector.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I exploit the clipboard service access control flaw to read sensitive files without explicit user consent.
Business
Confidential user data including credentials, messages, and personal information is exfiltrated.
3
Lateral reach — past segmentation narrative 3
Attacker
I chain this vulnerability with CVE-2021-25369 and CVE-2021-25370 to escalate privileges and modify system files.
Business
Device integrity is compromised, enabling persistent malware installation and complete system control.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05
Coverage & confidence
— what we know, and what we don’tEstablished (cited)
Coverage gaps — stated, not hidden
Disclosure & credit2
Catalogued by Samsung MobileCNA
Credited with finding itNo finder is named in the public CVE record or the scanned vendor advisory — attribution scoped to the sources checked.
Found an error? Propose a correction.
A correction is a cited counter-claim — it must cite a source,
gets reviewed by a second human, and is never auto-applied. See the
correction convention and our identity
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