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CVE-2021-3431— BT: Assertion failure on repeated LL_FEATURE_REQ

Quick assessment

Affected
zephyrproject-rtos zephyr
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Zephyr是Zephyr Project开源的一个可扩展的实时操作系统 (RTOS)。 Zephyr v2.5.0版本及之后版本存在安全漏洞，该漏洞源于使用重复的 LL_FEATURE_REQ 可达到断言。

CVSS 4.3 · Medium EPSS 0.89% · P59

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2021-3431

Vulnerability Information
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Vulnerability Title
BT: Assertion failure on repeated LL_FEATURE_REQ
Source: CVE Program / CVE List V5
Vulnerability Description
Assertion reachable with repeated LL_FEATURE_REQ. Zephyr versions >= v2.5.0 contain Reachable Assertion (CWE-617). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-7548-5m6f-mqv9
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
可达断言
Source: CVE Program / CVE List V5
Vulnerability Title
Zephyr 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zephyr是Zephyr Project开源的一个可扩展的实时操作系统 (RTOS)。 Zephyr v2.5.0版本及之后版本存在安全漏洞，该漏洞源于使用重复的 LL_FEATURE_REQ 可达到断言。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
zephyrproject-rtos zephyr v2.5.0 ~ unspecified -

II. Public POCs for CVE-2021-3431

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III. Intelligence Information for CVE-2021-3431

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Vendor Advisories for CVE-2021-3431 (1)

Same Patch Batch · zephyrproject-rtos · 2022-06-28 · 6 CVEs total

CVE-2021-3430 6.5 MEDIUM BT: Assertion failure on repeated LL_CONNECTION_PARAM_REQ
CVE-2021-3434 4.9 MEDIUM L2CAP: Stack based buffer overflow in le_ecred_conn_req()
CVE-2021-3432 4.3 MEDIUM BT: Invalid interval in CONNECT_IND leads to Division by Zero
CVE-2021-3433 4.0 MEDIUM BT: Invalid channel map in CONNECT_IND results to Deadlock
CVE-2021-3435 4.0 MEDIUM L2CAP: Information leakage in le_ecred_conn_req()

IV. Related Vulnerabilities

Same product: zephyr
Same vendor: zephyrproject-rtos
Same weakness: CWE-617

V. Comments for CVE-2021-3431

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