CVE-2021-1587— Cisco NX-OS Software VXLAN OAM (NGOAM) Denial of Service 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是美国思科（Cisco）公司的一套交换机使用的数据中心级操作系统软件。 Cisco NX-OS Software 中存在输入验证错误漏洞，该漏洞源于产品 VXLAN Operation、Administration、 Maintenance 功能的 TRILL (Transparent Interconnection of Lots of Links) OAM 未对输入数据包处理不当，攻击者可通过该漏洞导致拒绝服务。
Possible ATT&CK Techniques 3 AI
T1210 · Exploitation of Remote Services T1059 · Command and Scripting Interpreter T1499 · Endpoint Denial of Service
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2021-1587
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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 NX-OS Software VXLAN OAM (NGOAM) Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the VXLAN Operation, Administration, and Maintenance (OAM) feature of Cisco NX-OS Software, known as NGOAM, could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper handling of specific packets with a Transparent Interconnection of Lots of Links (TRILL) OAM EtherType. An attacker could exploit this vulnerability by sending crafted packets, including the TRILL OAM EtherType of 0x8902, to a device that is part of a VXLAN Ethernet VPN (EVPN) fabric. A successful exploit could allow the attacker to cause an affected device to experience high CPU usage and consume excessive system resources, which may result in overall control plane instability and cause the affected device to reload. Note: The NGOAM feature is disabled by default.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入的错误解释
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco NX-OS Software 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco NX-OS Software是美国思科（Cisco）公司的一套交换机使用的数据中心级操作系统软件。 Cisco NX-OS Software 中存在输入验证错误漏洞，该漏洞源于产品 VXLAN Operation、Administration、 Maintenance 功能的 TRILL (Transparent Interconnection of Lots of Links) OAM 未对输入数据包处理不当，攻击者可通过该漏洞导致拒绝服务。
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-2021-1587
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2021-1587
请登录查看更多情报信息。
Vendor Advisories for CVE-2021-1587 (1)
-
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-ngoam-dos-LTDb9Hv vendor-advisory x_refsource_CISCO
Same Patch Batch · Cisco · 2021-08-25 · 15 CVEs total
| CVE-2021-1577 | 9.1 CRITICAL | Cisco Application Policy Infrastructure Controller Arbitrary File Read and Write Vulnerabi |
| CVE-2021-1578 | 8.8 HIGH | Cisco Application Policy Infrastructure Controller Privilege Escalation Vulnerability |
| CVE-2021-1588 | 8.6 HIGH | Cisco NX-OS Software MPLS OAM Denial of Service Vulnerability |
| CVE-2021-1586 | 8.6 HIGH | Cisco Nexus 9000 Series Fabric Switches ACI Mode Multi-Pod and Multi-Site TCP Denial of Se |
| CVE-2021-1523 | 8.6 HIGH | Cisco Nexus 9000 Series Fabric Switches ACI Mode Queue Wedge Denial of Service Vulnerabili |
| CVE-2021-1579 | 8.1 HIGH | Cisco Application Policy Infrastructure Controller App Privilege Escalation Vulnerability |
| CVE-2021-1581 | 6.5 MEDIUM | Cisco Application Policy Infrastructure Controller Command Injection and File Upload Vulne |
| CVE-2021-1580 | 6.5 MEDIUM | Cisco Application Policy Infrastructure Controller Command Injection and File Upload Vulne |
| CVE-2021-1584 | 6.0 MEDIUM | Cisco Nexus 9000 Series Fabric Switches ACI Mode Privilege Escalation Vulnerability |
| CVE-2021-1591 | 5.8 MEDIUM | Cisco Nexus 9500 Series Switches Access Control List Bypass Vulnerability |
| CVE-2021-1582 | 5.4 MEDIUM | Cisco Application Policy Infrastructure Controller Stored Cross-Site Scripting Vulnerabili |
| CVE-2021-1590 | 5.3 MEDIUM | Cisco NX-OS Software system login block-for Denial of Service Vulnerability |
| CVE-2021-1583 | 4.4 MEDIUM | Cisco Nexus 9000 Series Fabric Switches ACI Mode Arbitrary File Read Vulnerability |
| CVE-2021-1592 | 4.3 MEDIUM | Cisco UCS Manager Software SSH Sessions Denial of Service Vulnerability |
IV. Related Vulnerabilities
Same product: Cisco NX-OS Software
-
CVE-2026-20212
Cisco Nexus 3000 and 9000 Series Switches Silicon One Hardwa -
CVE-2026-20171
Cisco Nexus 3000 and 9000 Series Border Gateway Protocol Den -
CVE-2026-20010
Cisco Nexus 3000 and 9000 Series Switches Link Layer Discove -
CVE-2026-20051
Cisco Nexus 3600-R and 9500-R Series Switching Platforms Lay -
CVE-2025-20241
Cisco Nexus 3000 and 9000 Series Switches IS-IS Protocol <TB
Same vendor: Cisco
-
CVE-2026-76504
Cisco Catalyst SD-WAN Manager System Account Authorization B -
CVE-2026-76426
Cisco ISE REST API SQL Injection Vulnerability -
CVE-2026-20121
CIsco FTD Bypass Access List -
CVE-2026-76431
Cisco Identity Services Engine Arbitrary File Deletion Vulne -
CVE-2026-76427
Cisco ISE XML External Entity Injection Vulnerability
Same weakness: CWE-115
-
CVE-2026-12491
Vllm: vllm: image exif rotation & png trns transparency not -
CVE-2025-68113
ALTCHA Proof-of-Work Vulnerable to Challenge Splicing and Re -
CVE-2025-54584
GitProxy is vulnerable to a packfile parsing exploit -
CVE-2025-5826
Autel MaxiCharger AC Wallbox Commercial ble_process_esp32_ms -
CVE-2025-5747
WOLFBOX Level 2 EV Charger MCU Command Parsing Misinterpreta
V. Comments for CVE-2021-1587
No comments yet