CVE-2021-25487: in the CISA KEV catalogue

Samsung Mobile Devices Out-of-Bounds Read Vulnerability. CISA added CVE-2021-25487 to the Known Exploited Vulnerabilities catalogue on 2023-06-29 with a default due date of 2023-07-20. Known ransomware campaign use: Unknown. Forensic triage flag: No.

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. (CISA description)

Vendor / product: Samsung Mobile Devices
CWE: CWE-125
CISA required action: Apply updates per vendor instructions or discontinue use of the product if updates are unavailable
EPSS: 0.64%, percentile 50 (scored 2026-11-03)

EPSS puts about 6.3 in 1,000 odds (0.64%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 50% of scored CVEs. Most CVEs score under 1%, so a high percentile can sit on a small probability: read the percentage first.

Vendor and reference links (from CISA)

Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.

Data dates. CISA KEV catalogue version 2026.11.03, released 2026-11-03, 1,767 entries (checked 2026-11-03). EPSS model v2026.06.15, scored 2026-11-03, 399,388 CVEs. Sources: CISA and FIRST (EPSS by FIRST; scores generated by Empirical Security). Copied to our own database and refreshed automatically; if a refresh fails, the previous copy keeps serving with its own date.

Frequently asked questions

Is CVE-2021-25487 in the CISA KEV catalogue?

Yes. CISA added CVE-2021-25487 (Samsung Mobile Devices Out-of-Bounds Read Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2023-06-29. CISA's default due date for it is 2023-07-20.

Is CVE-2021-25487 used in ransomware attacks?

CISA marks known ransomware campaign use as Unknown for CVE-2021-25487. That means CISA lacks confirmation, not that ransomware groups do not use it.

What should I do about CVE-2021-25487?

CISA's required action: Apply updates per vendor instructions or discontinue use of the product if updates are unavailable

Sources

CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
NVD record for CVE-2021-25487