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CVE-2025-20311

Quick assessment

Affected
Cisco Cisco IOS XE 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 IOS XE Software是美国思科（Cisco）公司的一种网络操作系统。 Cisco IOS XE Software存在代码问题漏洞，该漏洞源于对特制以太网帧处理不当，可能导致拒绝服务攻击。

CVSS 7.4 · High EPSS 0.20% · P9
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I. Basic Information for CVE-2025-20311

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the handling of certain Ethernet frames in Cisco IOS XE Software for Catalyst 9000 Series Switches could allow an unauthenticated, adjacent attacker to cause an egress port to become blocked and drop all outbound traffic. This vulnerability is due to improper handling of crafted Ethernet frames. An attacker could exploit this vulnerability by sending crafted Ethernet frames through an affected switch. A successful exploit could allow the attacker to cause the egress port to which the crafted frame is forwarded to start dropping all frames, resulting in a denial of service (DoS) condition.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
数据处理错误
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco IOS XE Software 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco IOS XE Software是美国思科（Cisco）公司的一种网络操作系统。 Cisco IOS XE Software存在代码问题漏洞，该漏洞源于对特制以太网帧处理不当，可能导致拒绝服务攻击。
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 IOS XE Software 16.6.1 -

II. Public POCs for CVE-2025-20311

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III. Intelligence Information for CVE-2025-20311

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Vendor Advisories for CVE-2025-20311 (1)

Same Patch Batch · Cisco · 2025-09-24 · 17 CVEs total

CVE-2025-20334 8.8 HIGH Cisco IOS XE 命令注入漏洞
CVE-2025-20315 8.6 HIGH Cisco IOS XE 安全漏洞
CVE-2025-20160 8.1 HIGH Cisco IOS和Cisco IOS XE Software 授权问题漏洞
CVE-2025-20327 7.7 HIGH Cisco IOS 安全漏洞
CVE-2025-20312 7.7 HIGH Cisco IOS XE 安全漏洞
CVE-2025-20352 7.7 HIGH Cisco IOS和Cisco IOS XE Software 安全漏洞
CVE-2025-20314 6.7 MEDIUM Cisco IOS XE 安全漏洞
CVE-2025-20313 6.7 MEDIUM Cisco IOS XE 安全漏洞
CVE-2025-20149 6.5 MEDIUM Cisco IOS和Cisco IOS XE 安全漏洞
CVE-2025-20240 6.1 MEDIUM Cisco IOS XE Software 安全漏洞
CVE-2025-20338 6.0 MEDIUM Cisco IOS XE 安全漏洞
CVE-2025-20339 5.8 MEDIUM Cisco SD-WAN vEdge Software Access Control List Bypass Vulnerability
CVE-2025-20316 5.3 MEDIUM Cisco IOS XE 访问控制错误漏洞
CVE-2025-20293 5.3 MEDIUM Cisco IOS XE Software 安全漏洞
CVE-2025-20365 4.3 MEDIUM Cisco Access Point Software 安全漏洞
CVE-2025-20364 4.3 MEDIUM Cisco Wireless LAN Controller 安全漏洞

IV. Related Vulnerabilities

Same product: Cisco IOS XE Software
Same vendor: Cisco
Same weakness: CWE-19

V. Comments for CVE-2025-20311

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