Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2021-40523

Quick assessment

Affected
n/a n/a
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是一套用于IoT（物联网）设备的开源跨平台操作系统。 Contiki-os Contiki 存在代码问题漏洞，该漏洞源于 Contiki 3.0 中，Telnet 选项协商处理不当。服务器和客户端在协商过程中，可能会因为异常条件处理不当，导致服务器对DO和WILL命令无法给出WILL/WONT或DO/DONT响应，从而导致属性违规和拒绝服务。 具体来说，服务器有时不发送响应，因为固定的缓冲区空间可用于所有响应，而该空间可能已耗尽。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.96% · P61
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2021-40523

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
In Contiki 3.0, Telnet option negotiation is mishandled. During negotiation between a server and a client, the server may fail to give the WILL/WONT or DO/DONT response for DO and WILL commands because of improper handling of exception condition, which leads to property violations and denial of service. Specifically, a server sometimes sends no response, because a fixed buffer space is available for all responses and that space may have been exhausted.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Contiki 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Contiki是一套用于IoT（物联网）设备的开源跨平台操作系统。 Contiki-os Contiki 存在代码问题漏洞，该漏洞源于 Contiki 3.0 中，Telnet 选项协商处理不当。服务器和客户端在协商过程中，可能会因为异常条件处理不当，导致服务器对DO和WILL命令无法给出WILL/WONT或DO/DONT响应，从而导致属性违规和拒绝服务。 具体来说，服务器有时不发送响应，因为固定的缓冲区空间可用于所有响应，而该空间可能已耗尽。
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
- n/a n/a -

II. Public POCs for CVE-2021-40523

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2021-40523

请登录查看更多情报信息。

Proof of Concept for CVE-2021-40523 (1)

Same Patch Batch · n/a · 2021-09-05 · 4 CVEs total

CVE-2021-23439 4.2 MEDIUM Cross-site Scripting (XSS)
CVE-2021-40524 Pure-FTPd 代码问题漏洞
CVE-2021-40516 WeeChat 缓冲区错误漏洞

IV. Related Vulnerabilities

Same product: n/a
Same vendor: n/a

V. Comments for CVE-2021-40523

No comments yet

Leave a comment