CVE-2021-3434— L2CAP: Stack based buffer overflow in le_ecred_conn_req()
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I. Basic Information for CVE-2021-3434
Vulnerability Information
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Vulnerability Title
L2CAP: Stack based buffer overflow in le_ecred_conn_req()
Source: NVD (National Vulnerability Database)
Vulnerability Description
Stack based buffer overflow in le_ecred_conn_req(). Zephyr versions >= v2.5.0 Stack-based Buffer Overflow (CWE-121). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-8w87-6rfp-cfrm
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
栈缓冲区溢出
Source: NVD (National Vulnerability Database)
Vulnerability Title
Zephyr 缓冲区错误漏洞
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 le_ecred_conn_req() 中存在基于堆栈的缓冲区溢出。
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-2021-3434
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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-2021-3431 | 4.3 MEDIUM | BT: Assertion failure on repeated LL_FEATURE_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
- CVE-2026-1677
net: TLS 1.2 connections allowed on TLS 1.3 sockets - CVE-2026-5590
net: ip/tcp: Null pointer dereference can be triggered by a - CVE-2026-1679
net: eswifi socket send payload length not bounded - CVE-2026-4179
stm32: usb: Infinite while loop in Interrupt Handler - CVE-2026-0849
crypto: ATAES132A response length allows stack buffer overfl
Same vendor: zephyrproject-rtos
- CVE-2026-1677
net: TLS 1.2 connections allowed on TLS 1.3 sockets - CVE-2026-5590
net: ip/tcp: Null pointer dereference can be triggered by a - CVE-2026-1679
net: eswifi socket send payload length not bounded - CVE-2026-4179
stm32: usb: Infinite while loop in Interrupt Handler - CVE-2026-0849
crypto: ATAES132A response length allows stack buffer overfl
Same weakness: CWE-121
- CVE-2026-8258
Squirrel sqstdstring.cpp validate_format stack-based overflo - CVE-2026-8234
EFM ipTIME A8004T WifiBasicSet formWifiBasicSet stack-based - CVE-2026-6665
PgBouncer buffer overflow in SCRAM - CVE-2026-41509
Integer underflow in crypto_sign_open() leads to buffer over - CVE-2026-8138
Tenda CX12L SetPptpServerCfg” formSetPPTPServer stack-based
V. Comments for CVE-2021-3434
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