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To cause the DoS, the attacker must have the SNMPv2c or earlier read-only community string or valid SNMPv3 user credentials. \r An authenticated, remote attacker with high privileges could execute code as the root user on an affected device that is running Cisco IOS XE Software. To execute code as the root user, the attacker must have the SNMPv1 or v2c read-only community string or valid SNMPv3 user credentials and administrative or privilege 15 credentials on the affected device. \r \r An attacker could exploit this vulnerability by sending a crafted SNMP packet to an affected device over IPv4 or IPv6 networks. \r\n\r This vulnerability is due to a stack overflow condition in the SNMP subsystem of the affected software. A successful exploit could allow a low-privileged attacker to cause the affected system to reload, resulting in a DoS condition, or allow a high-privileged attacker to execute arbitrary code as the root user and obtain full control of the affected system.\r\n\r Note: This vulnerability affects all versions of SNMP.",7.7,"v3.1","High",0.40169,{"cveId":177,"description":178,"publishedDate":179,"cvssScore":180,"cvssVersion":173,"severity":181,"isKev":17,"epssScore":182},"CVE-2020-3375","A vulnerability in Cisco SD-WAN Solution Software could allow an unauthenticated, remote attacker to cause a buffer overflow on an affected device. The vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending crafted traffic to an affected device. A successful exploit could allow the attacker to gain access to information that they are not authorized to access, make changes to the system that they are not authorized to make, and execute commands on an affected system with privileges of the root user.","2020-07-31",9.8,"Critical",0.03902,{"cveId":184,"description":185,"publishedDate":186,"cvssScore":180,"cvssVersion":173,"severity":181,"isKev":17,"epssScore":187},"CVE-2021-34727","A vulnerability in the vDaemon process in Cisco IOS XE SD-WAN Software could allow an unauthenticated, remote attacker to cause a buffer overflow on an affected device. This vulnerability is due to insufficient bounds checking when an affected device processes traffic. An attacker could exploit this vulnerability by sending crafted traffic to the device. A successful exploit could allow the attacker to cause a buffer overflow and possibly execute arbitrary commands with root-level privileges, or cause the device to reload, which could result in a denial of service condition.","2021-09-23",0.02629,{"cveId":189,"description":190,"publishedDate":191,"cvssScore":180,"cvssVersion":173,"severity":181,"isKev":17,"epssScore":192},"CVE-2021-1300","Multiple vulnerabilities in Cisco SD-WAN products could allow an unauthenticated, remote attacker to execute attacks against an affected device. For more information about these vulnerabilities, see the Details section of this advisory.","2021-01-20",0.02159,{"cveId":194,"description":190,"publishedDate":191,"cvssScore":180,"cvssVersion":173,"severity":181,"isKev":17,"epssScore":195},"CVE-2021-1301",0.0213,{"cveId":197,"description":198,"publishedDate":191,"cvssScore":199,"cvssVersion":173,"severity":174,"isKev":17,"epssScore":200},"CVE-2021-1274","Multiple vulnerabilities in Cisco SD-WAN products could allow an unauthenticated, remote attacker to execute denial of service (DoS) attacks against an affected device. For more information about these vulnerabilities, see the Details section of this advisory.",8.6,0.01917,{"cveId":202,"description":198,"publishedDate":191,"cvssScore":199,"cvssVersion":173,"severity":174,"isKev":17,"epssScore":203},"CVE-2021-1273",0.01901,{"cveId":205,"description":206,"publishedDate":186,"cvssScore":207,"cvssVersion":173,"severity":181,"isKev":17,"epssScore":208},"CVE-2021-1619","A vulnerability in the authentication, authorization, and accounting (AAA) function of Cisco IOS XE Software could allow an unauthenticated, remote attacker to bypass NETCONF or RESTCONF authentication and do either of the following: Install, manipulate, or delete the configuration of an affected device Cause memory corruption that results in a denial of service (DoS) on an affected device This vulnerability is due to an uninitialized variable. An attacker could exploit this vulnerability by sending a series of NETCONF or RESTCONF requests to an affected device. A successful exploit could allow the attacker to use NETCONF or RESTCONF to install, manipulate, or delete the configuration of a network device or to corrupt memory on the device, resulting a DoS.",9.1,0.01758,{"cveId":210,"description":198,"publishedDate":191,"cvssScore":211,"cvssVersion":173,"severity":174,"isKev":17,"epssScore":212},"CVE-2021-1278",7.5,0.01676,{"cveId":214,"description":198,"publishedDate":191,"cvssScore":199,"cvssVersion":173,"severity":174,"isKev":17,"epssScore":215},"CVE-2021-1279",0.01402,[217],{"cveId":170,"description":171,"publishedDate":12,"cvssScore":172,"severity":174,"isKev":4,"epssScore":175,"cisaVulnName":218,"cisaDateAdded":219,"cisaShortDescription":220,"cisaRequiredAction":221},"Cisco IOS and IOS XE Software SNMP Denial of Service and Remote Code Execution Vulnerability","2025-09-29","Cisco IOS and IOS XE contains a stack-based buffer overflow vulnerability in the Simple Network Management Protocol (SNMP) subsystem that could allow for denial of service or remote code execution. A successful exploit could allow a low-privileged attacker to cause the affected system to reload, resulting in a DoS condition, or allow a high-privileged attacker to execute arbitrary code as the root user and obtain full control of the affected system.","Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.",{"title":223,"metaDescription":224,"keywords":225,"structuredData":226},"Ios Xe Sd-wan by Cisco - Security Vulnerabilities & Analysis | Precursor Intelligence","Comprehensive security analysis for Ios Xe Sd-wan by Cisco covering 49 versions with 26 tracked vulnerabilities including 0 critical and 1 high-severity issues and 1 CISA KEV vulnerability. 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