Threats / Samsung / CVE-2021-25395
CVE-2021-25395
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-08-04
Samsung Mobile Devices vulnerability
Samsung mobile devices contain a race condition in the MFC charger driver enabling use-after-free writes when radio privilege is compromised, leading to potential code execution.
Verdict
Today item — known-exploited.
A race condition vulnerability in Samsung mobile device charger firmware allows an attacker with radio-level privileges to trigger a use-after-free condition, potentially enabling arbitrary memory writes and privilege escalation.
CISA KEV Yes · 2023-06-295EPSS 0.00366 (verify live)6CVSS 6.43CISA SSVC Exploitation: active · Automatable: no · Impact: total4
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 2023-06-29).
Probability (EPSS)
EPSS 0.00366 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
CVSS 6.4 (CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H) · 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-362 Race Condition.CWE — CNA-assigned (CVE.org); the weakness class drives how the flaw is exploited.
CISA SSVC (triage disposition)
Exploitation: active · Automatable: no · Technical Impact: totalCISA'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 748 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.
WeaknessCWE-362 · Race Condition
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 exploit a race condition in the MFC charger driver to trigger a use-after-free condition.
Business
Device firmware integrity is compromised, enabling unauthorized code execution at system level.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I leverage the use-after-free to write arbitrary data to freed memory regions.
Business
Attacker gains ability to modify kernel memory and escalate privileges beyond radio domain.
3
Lateral reach — past segmentation narrative 3
Attacker
I achieve code execution with elevated privileges to bypass security controls.
Business
Complete device compromise occurs, exposing user data and enabling persistent malware installation.
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 named in the public CVE record — the work behind this find is unattributed.