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CVE-2021-21280— Out-of-bounds write when processing 6LoWPAN extension headers

Quick assessment

Affected
contiki-ng contiki-ng
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.

Contiki-NG是一套用于下一代IoT（物联网）设备的开源跨平台操作系统。 Contiki-NG 存在缓冲区错误漏洞，该漏洞源于在4.6之前的版本中，当传输带有扩展头链的6LoWPAN包时，可能会导致越界写入。攻击者可利用该漏洞在写入的头没有被检查为在可用空间内时，使写入缓冲区外部成为可能。

CVSS 8.6 · High EPSS 1.06% · P62

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-21280

Vulnerability Information
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Vulnerability Title
Out-of-bounds write when processing 6LoWPAN extension headers
Source: CVE Program / CVE List V5
Vulnerability Description
Contiki-NG is an open-source, cross-platform operating system for internet of things devices. It is possible to cause an out-of-bounds write in versions of Contiki-NG prior to 4.6 when transmitting a 6LoWPAN packet with a chain of extension headers. Unfortunately, the written header is not checked to be within the available space, thereby making it possible to write outside the buffer. The problem has been patched in Contiki-NG 4.6. Users can apply the patch for this vulnerability out-of-band as a workaround.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
Contiki-NG 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Contiki-NG是一套用于下一代IoT（物联网）设备的开源跨平台操作系统。 Contiki-NG 存在缓冲区错误漏洞，该漏洞源于在4.6之前的版本中，当传输带有扩展头链的6LoWPAN包时，可能会导致越界写入。攻击者可利用该漏洞在写入的头没有被检查为在可用空间内时，使写入缓冲区外部成为可能。
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
contiki-ng contiki-ng < 4.6 -

II. Public POCs for CVE-2021-21280

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III. Intelligence Information for CVE-2021-21280

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Patches & Fixes for CVE-2021-21280 (1)

Vendor Advisories for CVE-2021-21280 (1)

Same Patch Batch · contiki-ng · 2021-06-18 · 6 CVEs total

CVE-2021-21282 8.6 HIGH Buffer overflow in RPL source routing header processing
CVE-2021-21257 8.2 HIGH Out-of-bounds write in RPL-Classic and RPL-Lite
CVE-2021-21410 8.2 HIGH Out-of-bounds read in the 6LoWPAN implementation
CVE-2021-21279 7.5 HIGH Infinite loop in IPv6 neighbor solicitation processing
CVE-2021-21281 7.0 HIGH Buffer overflow due to unvalidated TCP data offset

IV. Related Vulnerabilities

Same product: contiki-ng
Same vendor: contiki-ng
Same weakness: CWE-787

V. Comments for CVE-2021-21280

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