CVE-2025-55297

Code execution via BluFi buffer overflows

Published Aug 21, 2025 · Updated Aug 22, 2025

Buffer overflows in the ESP-IDF BluFi example allow remote attackers to execute code on ESP32 devices through Bluetooth input. Credential callbacks copy peer-supplied lengths into fixed global buffers, while blufi_dh_negotiate_data_handler uses peer-selected lengths with fixed-size key buffers. The device must run firmware built from the affected example and be within Bluetooth range; exploitation corrupts memory and can disclose secrets or execute code.

CVSS severity8.8
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflows in the ESP-IDF BluFi example allow remote attackers to execute code on ESP32 devices through Bluetooth input. Credential callbacks copy peer-supplied lengths into fixed global buffers, while blufi_dh_negotiate_data_handler uses peer-selected lengths with fixed-size key buffers. The device must run firmware built from the affected example and be within Bluetooth range; exploitation corrupts memory and can disclose secrets or execute code.

The record

CVE
CVE-2025-55297
Published
Aug 21, 2025
Updated
Aug 22, 2025
Vendor
Espressif Systems
Product
ESP-IDF
Classifications
CWE-120, CWE-131, T1210
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 21, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 22, 2025Record 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=< 5.0.9
  2. Affected versionversion=>= 5.1-beta1, < 5.1.6
  3. Affected versionversion=>= 5.2-beta1, < 5.3.3
  4. Affected versionversion=>= 5.4-beta1, < 5.4.1

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Espressif Systems · ESP-IDFversion=< 5.0.9; version=>= 5.1-beta1, < 5.1.6; version=>= 5.2-beta1, < 5.3.3; version=>= 5.4-beta1, < 5.4.1

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
5.2GitHub, Inc.CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U

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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-131Incorrect Calculation of Buffer Size
T1210Exploitation of Remote Services

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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