CVE-2020-16146Public exploitNetwork attack vector

Service crash via undersized BluFi heap allocation

Published Jan 12, 2021 · Updated Aug 4, 2024

Buffer overflow in BluFi provisioning in Espressif ESP-IDF 4.0.1 and earlier allows remote attackers to crash devices via a crafted GATT write. btc_blufi_recv_handler trusts a packet-declared total length when allocating aggr_buf, then copies hdr->data_len minus two bytes from the same packet without ensuring the write stays within that allocation. BluFi provisioning over BLE must be enabled and characteristic 0xFF01 reachable; successful exploitation corrupts heap memory and can crash the device.

CVSS severity7.5
High
EPSS probability1.38%
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 BluFi provisioning in Espressif ESP-IDF 4.0.1 and earlier allows remote attackers to crash devices via a crafted GATT write. btc_blufi_recv_handler trusts a packet-declared total length when allocating aggr_buf, then copies hdr->data_len minus two bytes from the same packet without ensuring the write stays within that allocation. BluFi provisioning over BLE must be enabled and characteristic 0xFF01 reachable; successful exploitation corrupts heap memory and can crash the device.

The record

CVE
CVE-2020-16146
Published
Jan 12, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 12, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/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.

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No observations available

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

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499Endpoint Denial of Service

Public exploit references

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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