CVE-2021-25479

Code execution via malformed LTE RRC reconfiguration

Published Oct 6, 2021 · Updated Aug 3, 2024

Heap-based buffer overflow in the Exynos CP chipset on selected Samsung Mobile Devices allows remote attackers to execute code via LTE signaling. A malformed RadioResourceConfigDedicated element is re-encoded into an undersized heap buffer, corrupting adjacent heap objects and metadata. An attacker-controlled LTE base station can reach the decoder without completed over-the-air security; triggering requires cellular radio proximity and specialized transmission equipment.

CVSS severity7.2
High
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in the Exynos CP chipset on selected Samsung Mobile Devices allows remote attackers to execute code via LTE signaling. A malformed RadioResourceConfigDedicated element is re-encoded into an undersized heap buffer, corrupting adjacent heap objects and metadata. An attacker-controlled LTE base station can reach the decoder without completed over-the-air security; triggering requires cellular radio proximity and specialized transmission equipment.

The record

CVE
CVE-2021-25479
Published
Oct 6, 2021
Updated
Aug 3, 2024
Vendor
Samsung Electronics Co., Ltd.
Product
Samsung Mobile Devices
Classifications
CWE-787, CWE-122, T1203
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 6, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=O(8.1), P(9.0), Q(10.0), R(11.0) <SMR Oct-2021 Release 1

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Samsung Electronics Co., Ltd. · Samsung Mobile Devicesversion=O(8.1), P(9.0), Q(10.0), R(11.0) <SMR Oct-2021 Release 1

Published CVSS scores

7.2Samsung MobileCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-122Heap-based Buffer Overflow
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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