How severe is CVE-2021-25487?

CVE-2021-25487 has a CVSS score of 7.3/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2021-25487?

Affected package information for CVE-2021-25487 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2021-25487?

No fixed version has been published for CVE-2021-25487 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2021-25487 actively exploited in the wild?

Yes. There are 2 known exploit references for CVE-2021-25487, including 2 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2021-25487?

CVE-2021-25487 has an EPSS (Exploit Prediction Scoring System) score of 2.6%, placing it in the 86th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

Is CVE-2021-25487 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2021-25487 (Samsung Mobile Devices Out-of-Bounds Read Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2023-06-29. CISA required all US federal civilian agencies to remediate this vulnerability by 2023-07-20. The required action was: Apply updates per vendor instructions or discontinue use of the product if updates are unavailable Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2021-25487?

CVE-2021-25487 is classified as Out-of-bounds Read (CWE-125). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Which products and versions are affected by CVE-2021-25487?

CVE-2021-25487 affects samsung android (4 versions, e.g. 8.1, 9.0, 10.0…). Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2021-25487 published, and has it been updated?

CVE-2021-25487 was published on October 6, 2021 and was last updated on October 30, 2025. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2023-06-29 — agencies required to remediate by 2023-07-20

CVE-2021-25487

HIGH

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…

Published

Oct 6, 2021

Updated

Oct 30, 2025

Affected

0 pkgs

Patched

None yet

Exploits

2 known

EPSS Exploitation Probability

via FIRST.org ↗

2.6%probability of exploitation in next 30 days

Lower Risk86th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

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.

Affected Products

1 product · 28 configurations

androidsamsung

4 versions

8.19.010.011.0

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Lack of boundary checking of a buffer in set_skb_priv() of modem interfa…

security.samsungmobile.comGoogle-sheetJul 2021

Lack of boundary checking of a buffer in set_skb_priv() of modem interfa…

cisa.govCISAJun 2023

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2021-25487 in your stack?

O3 detects CVE-2021-25487 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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