CVE-2021-1588— Cisco NX-OS Software MPLS OAM Denial of Service Vulnerability
Get alerts for future matching vulnerabilitiesLog in to subscribe
I. Basic Information for CVE-2021-1588
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View Shenlong Deep Dive ↗ Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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 MPLS OAM Denial of Service Vulnerability
Source: NVD (National Vulnerability Database)
Vulnerability Description
A vulnerability in the MPLS Operation, Administration, and Maintenance (OAM) feature of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper input validation when an affected device is processing an MPLS echo-request or echo-reply packet. An attacker could exploit this vulnerability by sending malicious MPLS echo-request or echo-reply packets to an interface that is enabled for MPLS forwarding on the affected device. A successful exploit could allow the attacker to cause the MPLS OAM process to crash and restart multiple times, causing the affected device to reload and resulting in a DoS condition.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
缓冲区上溢读取
Source: NVD (National Vulnerability Database)
Vulnerability Title
Cisco NX-OS Software 缓冲区错误漏洞
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 存在安全漏洞，攻击者利用该漏洞导致受影响设备拒绝服务。
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-2021-1588
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2021-1588
请登录查看更多情报信息。
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-mpls-oam-dos-sGO9x5GMvendor-advisoryx_refsource_CISCO
- https://nvd.nist.gov/vuln/detail/CVE-2021-1588
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-2021-1587 | 8.6 HIGH | Cisco NX-OS Software VXLAN OAM (NGOAM) 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-2026-20010
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 - CVE-2025-20262
Cisco Nexus 3000 and 9000 Series Switches Protocol Independe - CVE-2025-20290
Cisco NXOS Software Sensitive Log Information Disclosure Vul
Same vendor: Cisco
- CVE-2026-20219
Cisco Slido 安全漏洞 - CVE-2026-20034
Cisco Unity Connection Remote Code Execution Vulnerability - CVE-2026-20035
Cisco Unity Connection Server-Side Request Forgery Vulnerabi - CVE-2026-20167
Cisco IoT Field Network Director Remote Device Denial of Ser - CVE-2026-20169
Cisco IoT Field Network Director Command Injection Vulnerabi
V. Comments for CVE-2021-1588
No comments yet