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CVE-2021-1220— Cisco IOS XE Software Web UI Denial of Service Vulnerabilities

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）公司的一个操作系统。用于企业有线和无线访问，汇聚，核心和WAN的单一操作系统，Cisco IOS XE降低了业务和网络的复杂性。 Cisco IOS XE Software 存在输入验证错误漏洞，该漏洞源于web UI中的错误处理不足。允许经过身份验证的、具有只读权限的远程攻击者可利用该漏洞导致web UI软件失去响应并消耗vty line实例，从而导致拒绝服务(DoS)条件。

CVSS 4.3 · Medium EPSS 0.94% · P58
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I. Basic Information for CVE-2021-1220

Vulnerability Information
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Vulnerability Title
Cisco IOS XE Software Web UI Denial of Service Vulnerabilities
Source: CVE Program / CVE List V5
Vulnerability Description
Multiple vulnerabilities in the web UI of Cisco IOS XE Software could allow an authenticated, remote attacker with read-only privileges to cause the web UI software to become unresponsive and consume vty line instances, resulting in a denial of service (DoS) condition. These vulnerabilities are due to insufficient error handling in the web UI. An attacker could exploit these vulnerabilities by sending crafted HTTP packets to an affected device. A successful exploit could allow the attacker to cause the web UI software to become unresponsive and consume all available vty lines, preventing new session establishment and resulting in a DoS condition. Manual intervention would be required to regain web UI and vty session functionality. Note: These vulnerabilities do not affect the console connection.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco IOS XE Software 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco IOS XE Software是美国思科（Cisco）公司的一个操作系统。用于企业有线和无线访问，汇聚，核心和WAN的单一操作系统，Cisco IOS XE降低了业务和网络的复杂性。 Cisco IOS XE Software 存在输入验证错误漏洞，该漏洞源于web UI中的错误处理不足。允许经过身份验证的、具有只读权限的远程攻击者可利用该漏洞导致web UI软件失去响应并消耗vty line实例，从而导致拒绝服务(DoS)条件。
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 n/a -

II. Public POCs for CVE-2021-1220

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III. Intelligence Information for CVE-2021-1220

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Vendor Advisories for CVE-2021-1220 (1)

Same Patch Batch · Cisco · 2021-03-24 · 45 CVEs total

CVE-2021-1418 9.9 CRITICAL Cisco Jabber Desktop and Mobile Client Software Vulnerabilities
CVE-2021-1471 9.9 CRITICAL Cisco Jabber Desktop and Mobile Client Software Vulnerabilities
CVE-2021-1469 9.9 CRITICAL Cisco Jabber Desktop and Mobile Client Software Vulnerabilities
CVE-2021-1411 9.9 CRITICAL Cisco Jabber Desktop and Mobile Client Software Vulnerabilities
CVE-2021-1417 9.9 CRITICAL Cisco Jabber Desktop and Mobile Client Software Vulnerabilities
CVE-2021-1446 8.6 HIGH Cisco IOS XE Software DNS NAT Protocol Application Layer Gateway Denial of Service Vulnera
CVE-2021-1373 8.6 HIGH Cisco IOS XE Wireless Controller Software for the Catalyst 9000 Family CAPWAP Denial of Se
CVE-2021-1433 8.1 HIGH Cisco IOS XE SD-WAN Software vDaemon Buffer Overflow Vulnerability
CVE-2021-1451 8.1 HIGH Cisco IOS XE Software Easy Virtual Switching System Arbitrary Code Execution Vulnerability
CVE-2021-1392 7.8 HIGH Cisco IOS and IOS XE Software Common Industrial Protocol Privilege Escalation Vulnerabili
CVE-2021-1431 7.5 HIGH Cisco IOS XE SD-WAN Software vDaemon Denial of Service Vulnerability
CVE-2021-1437 7.5 HIGH Cisco Aironet Access Points FlexConnect Upgrade Information Disclosure Vulnerability
CVE-2021-1403 7.4 HIGH Cisco IOS XE Software Web UI Cross-Site WebSocket Hijacking Vulnerability
CVE-2021-1352 7.4 HIGH Cisco IOS XE Software DECnet Phase IV/OSI Denial of Service Vulnerability
CVE-2021-1439 7.4 HIGH Cisco Aironet Access Points FlexConnect Multicast DNS Denial of Service Vulnerability
CVE-2021-1432 7.3 HIGH Cisco IOS XE SD-WAN Software Arbitrary Command Execution Vulnerability
CVE-2021-1453 6.8 MEDIUM Cisco IOS XE Software for the Catalyst 9000 Family Arbitrary Code Execution Vulnerability
CVE-2021-1452 6.8 MEDIUM Cisco IOS XE ROM Monitor Software for Cisco Industrial Switches OS Command Injection Vulne
CVE-2021-1398 6.8 MEDIUM Cisco IOS XE Software Arbitrary Code Execution Vulnerability
CVE-2021-1441 6.7 MEDIUM Cisco IOS XE Software Hardware Initialization Routines Arbitrary Code Execution Vulnerabil

Showing top 20 of 45 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Cisco IOS XE Software
Same vendor: Cisco
Same weakness: CWE-20

V. Comments for CVE-2021-1220

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