Exploited. On CISA's list since 2023-06-29.
Samsung Mobile Devices Out-of-Bounds Read Vulnerability
CVE-2021-25487 · Samsung Mobile Devices · Published 2021-10-06
How bad would it be?
7.8 out of 10
CVSS rates it high.
How likely is it to be used?
0.6%
Estimated chance of exploitation in the next 30 days, higher than 50% of all scored flaws (EPSS, 2026-10-29).
Is it already being used?
Yes
CISA has seen it exploited in real attacks. For US government agencies the fix is deadline passed 1198 days ago (2023-07-20).
What CISA says to do
Apply updates per vendor instructions or discontinue use of the product if updates are unavailable
Samsung mobile devices contain an out-of-bounds read vulnerability within the modem interface driver due to a lack of boundary checking of a buffer in set_skb_priv(), leading to remote code execution by dereference of an invalid function pointer.
What the flaw is
Lack of boundary checking of a buffer in set_skb_priv() of modem interface driver prior to SMR Oct-2021 Release 1 allows OOB read and it results in arbitrary code execution by dereference of invalid function pointer.
From the NVD.
Fixes and advisories
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Understand the kind of weakness behind this flaw. These resources teach the weakness, rather than reproduce this specific CVE. Follow the vendor's advice above to fix the affected product.
CWE-125 · CISA KEV; NVD record: mobile.security@samsung.com; NVD record: nvd@nist.gov. We have not selected a close learning match for this label.
CWE is a catalogue of weakness types. Labels come from the sources shown and can differ or change. Resource matches reviewed 16 October 2026.
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Exploited flaws from CISA's KEV catalogue. Chance of exploitation from EPSS by FIRST. Descriptions and scores from the NVD. This product uses the NVD API but is not endorsed or certified by the NVD.