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

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2021-1368— Cisco FXOS and NX-OS Software Unidirectional Link Detection Denial of Service and Arbitrary Code Execution Vulnerability

Quick assessment

Affected
Cisco Cisco NX-OS Software
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.

Cisco NX-OS Software和Cisco FXOS Software都是美国思科（Cisco）公司的产品。Cisco NX-OS Software是一套交换机使用的数据中心级操作系统软件。Cisco FXOS Software是一套运行在思科安全设备中的防火墙软件。 Cisco FXOS Software and Cisco NX-OS Software 存在安全漏洞，该漏洞输入验证不足造成的。

CVSS 8.8 · High EPSS 0.46% · P37
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2021-1368

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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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
Cisco FXOS and NX-OS Software Unidirectional Link Detection Denial of Service and Arbitrary Code Execution Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the Unidirectional Link Detection (UDLD) feature of Cisco FXOS Software and Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to execute arbitrary code with administrative privileges or cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending crafted Cisco UDLD protocol packets to a directly connected, affected device. A successful exploit could allow the attacker to execute arbitrary code with administrative privileges or cause the Cisco UDLD process to crash and restart multiple times, causing the affected device to reload and resulting in a DoS condition. Note: The UDLD feature is disabled by default, and the conditions to exploit this vulnerability are strict. The attacker needs full control of a directly connected device. That device must be connected over a port channel that has UDLD enabled. To trigger arbitrary code execution, both the UDLD-enabled port channel and specific system conditions must exist. In the absence of either the UDLD-enabled port channel or the system conditions, attempts to exploit this vulnerability will result in a DoS condition. It is possible, but highly unlikely, that an attacker could control the necessary conditions for exploitation. The CVSS score reflects this possibility. However, given the complexity of exploitation, Cisco has assigned a Medium Security Impact Rating (SIR) to this vulnerability.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco FXOS Software and Cisco NX-OS Software 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco NX-OS Software和Cisco FXOS Software都是美国思科（Cisco）公司的产品。Cisco NX-OS Software是一套交换机使用的数据中心级操作系统软件。Cisco FXOS Software是一套运行在思科安全设备中的防火墙软件。 Cisco FXOS Software and Cisco NX-OS Software 存在安全漏洞，该漏洞输入验证不足造成的。
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
Cisco Cisco NX-OS Software n/a -

II. Public POCs for CVE-2021-1368

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

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2021-1368

请登录查看更多情报信息。

Vendor Advisories for CVE-2021-1368 (1)

Same Patch Batch · Cisco · 2021-02-24 · 13 CVEs total

CVE-2021-1388 10.0 CRITICAL Cisco ACI Multi-Site Orchestrator Application Services Engine Deployment Authentication By
CVE-2021-1361 9.8 CRITICAL Cisco NX-OS Software Unauthenticated Arbitrary File Actions Vulnerability
CVE-2021-1393 9.8 CRITICAL Cisco Application Services Engine Unauthorized Access Vulnerabilities
CVE-2021-1396 9.8 CRITICAL Cisco Application Services Engine Unauthorized Access Vulnerabilities
CVE-2021-1230 8.6 HIGH Cisco Nexus 9000 Series Fabric Switches ACI Mode BGP Route Installation Denial of Service
CVE-2021-1387 8.6 HIGH Cisco NX-OS Software IPv6 Netstack Denial of Service Vulnerability
CVE-2021-1228 7.4 HIGH Cisco Nexus 9000 Series Fabric Switches ACI Mode Fabric Infrastructure VLAN Unauthorized A
CVE-2021-1229 5.8 MEDIUM Cisco NX-OS Software ICMP Version 6 Memory Leak Denial of Service Vulnerability
CVE-2021-1450 5.5 MEDIUM Cisco AnyConnect Secure Mobility Client Denial of Service Vulnerability
CVE-2021-1231 4.7 MEDIUM Cisco Nexus 9000 Series Fabric Switches ACI Mode Link Layer Discovery Protocol Port Denial
CVE-2021-1367 4.3 MEDIUM Cisco NX-OS Software Protocol Independent Multicast Denial of Service Vulnerability
CVE-2021-1227 Cisco NX-OS Software NX-API Cross-Site Request Forgery Vulnerability

IV. Related Vulnerabilities

Same product: Cisco NX-OS Software
Same vendor: Cisco
Same weakness: CWE-787

V. Comments for CVE-2021-1368

No comments yet

Leave a comment