CVE-2024-48986Network attack vector

Service interruption via unchecked HCI event length

Published Nov 20, 2024 · Updated Nov 26, 2024

Buffer overflow in the HCI event parser in Arm Mbed OS 6.16.0 allows remote attackers to interrupt service via crafted HCI packets. The event callback allocates a buffer from a table-derived event size, but the subsequent copy trusts the larger length byte in the packet header. Reachability requires delivery of arbitrary HCI event packets; the overflow can disrupt processing, but complete device shutdown or further control is not established.

CVSS severity7.5
High
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in the HCI event parser in Arm Mbed OS 6.16.0 allows remote attackers to interrupt service via crafted HCI packets. The event callback allocates a buffer from a table-derived event size, but the subsequent copy trusts the larger length byte in the packet header. Reachability requires delivery of arbitrary HCI event packets; the overflow can disrupt processing, but complete device shutdown or further control is not established.

The record

CVE
CVE-2024-48986
Published
Nov 20, 2024
Updated
Nov 26, 2024
Vendor
Arm
Product
Arm Mbed OS
Classifications
CWE-120, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 20, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 26, 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=6.16.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Arm · Arm Mbed OSversion=6.16.0

Published CVSS scores

7.5CISACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499.004Application or System Exploitation

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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