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CVE-2026-81507

ESF-IDF: Bluetooth Classic L2CAP Heap Memory Disclosure Allowing Unauthorized Access to Sensitive Data

CVSS score

6.5

EPSS probability

—

Risk score

0.7

Published

8 h ago

OverviewPublic Exploits (0)NewsroomVulnerability Timeline
Patch status has not yet been verified

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Vulnerability description

CVE AI research

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DayBreach AI Explanation

Verified against sources

CVE-2026-81507: ESP-IDF BlueDroid L2CAP Out-of-bounds Read Vulnerability

Sources read

1

Source agreement

Tam uyum

Evidence confidence

%55

Short explanation

An out-of-bounds read vulnerability in ESP-IDF BlueDroid L2CAP configuration-option processing allows an unauthenticated remote peer within radio range to leak sensitive Bluetooth stack memory.

Why does it matter?

This unauthenticated vulnerability enables attackers within close proximity to read sensitive information from the Bluetooth stack memory, potentially leading to privacy breaches.

What should be done?

  • Follow the provided patch releases or updates
  • Review the vendor advisory
  • Apply the corresponding commit patches
Chain of evidence and sources2 verified claims

ESP-IDF BlueDroid L2CAP yapılandırma seçeneği işleme süreci, seçenek uzunluklarını kalan paket baytlarına karşı tutarlı bir şekilde doğrulamamaktadır.

S0 · daybreach-canonicalS1 · nvd

Kimlik doğrulanmamış uzak bir BR/EDR eşi, radyo menzilinden hatalı biçimlendirilmiş bir L2CAP yapılandırma isteği göndererek sınır dışı okumaya neden olabilir.

S0 · daybreach-canonicalS1 · nvd
Show the technical text from the sources

ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. Prior to 5.2.8, 5.3.6, 5.5.5, 6.0.3, and 6.1-rc1, ESP-IDF BlueDroid L2CAP configuration-option processing in l2c_main.c and l2c_utils.c does not consistently validate option lengths against the remaining received packet bytes. A remote unauthenticated BR/EDR peer within radio range can send a malformed L2CAP configuration request that causes an out-of-bounds read, and under some runtime conditions limited adjacent Bluetooth stack memory can be included in an outbound L2CAP Configuration Response. The issue affects ESP32-class products using the BlueDroid host stack with Classic Bluetooth enabled. This issue is fixed in 5.2.8, 5.3.6, 5.5.5, 6.0.3, and 6.1-rc1.

CVSS vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CWE: CWE-125

Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-81507 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

IDVENDORPRODUCTACTION
1espressifesp-idf View
Total affected vendors: 1|Products: 1

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCOREVERSIONSEVERITYVECTORSOURCE
6.5CVSS V3_1MEDIUMCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NCVE CNA
6.5CVSS V31MEDIUMCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NNVD

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Confirm the affected product and version against the source evidence above.
Restrict access to internet-facing services and apply network segmentation.
Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.
Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-81507 is associated with the following CWEs:

CWE-125: Out-of-bounds Read

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-81507 weaknesses.

CAPEC-66: SQL InjectionCAPEC-126: Path TraversalCAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureBitişik ağ
PermissionsGerekmiyor
UserGerekmiyor

Official Sources and Advisories

https://github.com/espressif/esp-idf/security/advisories/GHSA-v335-fxwc-rc44vendor-advisoryhttps://github.com/espressif/esp-idf/commit/14c99559b4337cabcf0f09c21d16b93c4cd7a6fevendor-advisoryhttps://github.com/espressif/esp-idf/commit/1e07f6d83ca892630a7210df2958455f7ca77b4avendor-advisoryhttps://github.com/espressif/esp-idf/commit/5731c63ece128f156939b9f734256e2227c1442avendor-advisoryhttps://github.com/espressif/esp-idf/commit/8de265dc44b1b22c749ea44ee7c609b3da4162f0vendor-advisoryhttps://github.com/espressif/esp-idf/commit/9a6d04f65e0e341e7d72bd417c9f31b8a04ce846vendor-advisoryhttps://github.com/espressif/esp-idf/commit/c2610255a5adce651ca582bb82368c3dd0ee2834vendor-advisoryhttps://github.com/espressif/esp-idf/commit/c8cd8f4f3019ae2f912c8cbe9974445e8d9b8749vendor-advisoryhttps://github.com/espressif/esp-idf/releases/tag/v5.2.8vendor-advisoryhttps://github.com/espressif/esp-idf/releases/tag/v5.3.6vendor-advisory

CVSS Vector Radar Chart

6.5 / 10
Attack VectorAdjacentComplexityLowPrivilegesNoneUser Interact.NoneConfidentialityLowIntegrityNoneAvailabilityNone

Vulnerability Scoring Details

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack VectorAdjacent network
Attack ComplexityLow
Privileges RequiredNone required
User InteractionNone required
Confidentiality (Gizlilik)Low
Integrity (Bütünlük)None
Availability (Erişilebilirlik)None

Yama durumu bilinmiyor

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Weakness Type (CWE & CAPEC)

CWE-125

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