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CVE-2021-1243— Cisco IOS XR Software SNMP Management Plane Protection ACL Bypass Vulnerability

Quick assessment

Affected
Cisco Cisco IOS XR 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 XR是美国思科（Cisco）公司的一套为其网络设备开发的操作系统。 Cisco IOS XR 软件中SNMP管理面板存在安全漏洞中存在漏洞。该漏洞是由于在将SNMP与管理平面保护配合使用时，LPTS编程不正确造成的。即使配置为拒绝访问SNMP的管理平面保护，也允许未经身份验证的远程攻击者允许连接受影响设备的服务器。

CVSS 5.3 · Medium EPSS 1.27% · P68

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-1243

Vulnerability Information
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Vulnerability Title
Cisco IOS XR Software SNMP Management Plane Protection ACL Bypass Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the Local Packet Transport Services (LPTS) programming of the SNMP with the management plane protection feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to allow connections despite the management plane protection that is configured to deny access to the SNMP server of an affected device. This vulnerability is due to incorrect LPTS programming when using SNMP with management plane protection. An attacker could exploit this vulnerability by connecting to an affected device using SNMP. A successful exploit could allow the attacker to connect to the device on the configured SNMP ports. Valid credentials are required to execute any of the SNMP requests.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco IOS XR 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco IOS XR是美国思科（Cisco）公司的一套为其网络设备开发的操作系统。 Cisco IOS XR 软件中SNMP管理面板存在安全漏洞中存在漏洞。该漏洞是由于在将SNMP与管理平面保护配合使用时，LPTS编程不正确造成的。即使配置为拒绝访问SNMP的管理平面保护，也允许未经身份验证的远程攻击者允许连接受影响设备的服务器。
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 XR Software n/a -

II. Public POCs for CVE-2021-1243

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III. Intelligence Information for CVE-2021-1243

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Vendor Advisories for CVE-2021-1243 (1)

Same Patch Batch · Cisco · 2021-02-04 · 56 CVEs total

CVE-2021-1289 9.8 CRITICAL Cisco Small Business RV160, RV160W, RV260, RV260P, and RV260W VPN Routers Remote Code Exec
CVE-2021-1290 9.8 CRITICAL Cisco Small Business RV160, RV160W, RV260, RV260P, and RV260W VPN Routers Remote Code Exec
CVE-2021-1291 9.8 CRITICAL Cisco Small Business RV160, RV160W, RV260, RV260P, and RV260W VPN Routers Remote Code Exec
CVE-2021-1292 9.8 CRITICAL Cisco Small Business RV160, RV160W, RV260, RV260P, and RV260W VPN Routers Remote Code Exec
CVE-2021-1293 9.8 CRITICAL Cisco Small Business RV160, RV160W, RV260, RV260P, and RV260W VPN Routers Remote Code Exec
CVE-2021-1294 9.8 CRITICAL Cisco Small Business RV160, RV160W, RV260, RV260P, and RV260W VPN Routers Remote Code Exec
CVE-2021-1295 9.8 CRITICAL Cisco Small Business RV160, RV160W, RV260, RV260P, and RV260W VPN Routers Remote Code Exec
CVE-2021-1313 8.6 HIGH Cisco IOS XR Software Enf Broker Denial of Service Vulnerability
CVE-2021-1288 8.6 HIGH Cisco IOS XR Software Enf Broker Denial of Service Vulnerability
CVE-2021-1297 7.5 HIGH Cisco Small Business RV160, RV160W, RV260, RV260P, and RV260W VPN Routers Arbitrary File W
CVE-2021-1296 7.5 HIGH Cisco Small Business RV160, RV160W, RV260, RV260P, and RV260W VPN Routers Arbitrary File W
CVE-2021-1268 7.4 HIGH Cisco IOS XR Software IPv6 Flood Denial of Service Vulnerability
CVE-2021-1322 7.2 HIGH Cisco Small Business RV Series Routers Management Interface Remote Command Execution and D
CVE-2021-1330 7.2 HIGH Cisco Small Business RV Series Routers Management Interface Remote Command Execution and D
CVE-2021-1323 7.2 HIGH Cisco Small Business RV Series Routers Management Interface Remote Command Execution and D
CVE-2021-1324 7.2 HIGH Cisco Small Business RV Series Routers Management Interface Remote Command Execution and D
CVE-2021-1325 7.2 HIGH Cisco Small Business RV Series Routers Management Interface Remote Command Execution and D
CVE-2021-1329 7.2 HIGH Cisco Small Business RV Series Routers Management Interface Remote Command Execution and D
CVE-2021-1327 7.2 HIGH Cisco Small Business RV Series Routers Management Interface Remote Command Execution and D
CVE-2021-1326 7.2 HIGH Cisco Small Business RV Series Routers Management Interface Remote Command Execution and D

Showing top 20 of 56 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Cisco IOS XR Software
Same vendor: Cisco
Same weakness: CWE-284

V. Comments for CVE-2021-1243

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