Threats / Samsung / CVE-2021-25487
CVE-2021-25487
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
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.
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 0.0062 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Samsung, Mobile Devices. Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-125 Out-of-bounds Read — weakness family: Memory safety.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
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.