Threats / Samsung / CVE-2021-25487
CVE-2021-25487
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-08-04
Samsung Mobile Devices vulnerability
Samsung mobile devices contain an out-of-bounds read vulnerability in the modem interface driver due to insufficient boundary checking in set_skb_priv(), enabling remote code execution through invalid function pointer dereference.
Verdict
Today item — known-exploited.
An unauthenticated remote attacker can exploit this out-of-bounds read to achieve code execution on affected Samsung mobile devices. The vulnerability has been observed in active exploitation. No CVSS score is available.
CISA KEV Yes · 2023-06-295EPSS 0.00635 (verify live)6CVSS 7.33CISA 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 0.00635 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
CVSS 7.3 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/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-125 Out-of-bounds Read — weakness family: Memory safety.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 631 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 craft a malformed network packet targeting the modem interface driver to trigger the out-of-bounds read condition.
Business
Device security perimeter is compromised without user interaction or authentication.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I dereference an invalid function pointer via the corrupted buffer to redirect execution flow to my payload.
Business
Attacker gains arbitrary code execution with modem-level privileges on the device.
3
Lateral reach — past segmentation narrative 3
Attacker
I establish persistence or exfiltrate sensitive data from the compromised device.
Business
Customer data confidentiality and device integrity are violated; brand reputation and user trust are damaged.
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.