发布日期：2021-09-22
更新日期：2021-09-23

受影响系统：

Cisco Catalyst 9800 Series Wireless Controllers
Cisco Catalyst 9800 Embedded Wireless Controller for Catalyst 9500 Series
Cisco Catalyst 9800 Embedded Wireless Controller for Catalyst 9400 Series
Cisco Catalyst 9800 Embedded Wireless Controller for Catalyst 9300 Series
Cisco Embedded Wireless Controller on Catalyst Access Po
Cisco Catalyst 9800 Wireless Controllers for Cloud

描述：

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CVE(CAN) ID: CVE-2021-1611

Cisco IOS XE是美国Cisco公司为其网络设备开发的一套基于Linux内核的模块化操作系统。
Cisco IOS XE Software for Catalyst 9800 Series的Ethernet over GRE (EoGRE) 数据包存在拒绝服务漏洞。该漏洞源于程序未对格式畸形的EoGRE数据包进行正确处理。未经身份认证的攻击者可利用该漏洞导致拒绝服务。

<*链接：https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ewlc-gre-6u4ELzAT
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建议：

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厂商补丁：

Cisco
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Cisco已经为此发布了一个安全公告（cisco-sa-ewlc-gre-6u4ELzAT）以及相应补丁:
cisco-sa-ewlc-gre-6u4ELzAT：Cisco IOS XE Software for Catalyst 9800 Series Wireless Controllers EoGRE Denial of Service Vulnerability
链接：https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ewlc-gre-6u4ELzAT

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