{"id":85921,"date":"2025-11-29T21:37:28","date_gmt":"2025-11-29T21:37:28","guid":{"rendered":""},"modified":"-0001-11-30T00:00:00","modified_gmt":"-0001-11-30T00:00:00","slug":"cve-2025-20312-denial-of-service-vulnerability-in-cisco-ios-xe-software-s-snmp-subsystem","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-20312-denial-of-service-vulnerability-in-cisco-ios-xe-software-s-snmp-subsystem\/","title":{"rendered":"CVE-2025-20312: Denial of Service Vulnerability in Cisco IOS XE Software’s SNMP Subsystem<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

This report delves into a substantial vulnerability located within the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS XE Software. The vulnerability, identified as CVE-2025-20312, could potentially enable an authenticated, remote attacker to instigate a Denial of Service (DoS) condition on an affected device. This issue is of significant importance due to its impact on system availability, its potential for system compromise, and the risk of data leakage.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-20312
\nSeverity: High (CVSS: 7.7)
\nAttack Vector: Network
\nPrivileges Required: Low (Authenticated Access Required)
\nUser Interaction: None
\nImpact: Denial of Service, potential system compromise, and data leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

Cisco IOS XE Software | SNMP versions 1, 2c, and 3<\/p>\n

How the Exploit Works<\/strong><\/p>\n

The vulnerability originates from improper error handling when parsing a specific SNMP request. An attacker, given authenticated access, could exploit this vulnerability by sending a uniquely crafted SNMP request to the target device. Successful exploitation could cause the device to reload unexpectedly, leading to a Denial of Service condition and potential further compromise of the system.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

Below is a conceptual example of how the vulnerability might be exploited. This is a pseudocode representation of a malicious SNMP request:<\/p>\n

snmpset -v:3 -u:valid_user -l:authPriv -a:MD5 -A:auth_password -x:DES -X:priv_password target_IP_address .1.3.6.1.2.1.1.6.0 x \"malicious_string\"<\/code><\/pre>\n
In this example, the `snmpset` command is used to send an SNMP request to the target’s IP address. The `-v:3` flag specifies the SNMP version, and `-u:valid_user`, `-a:MD5`, `-A:auth_password`, `-x:DES`, and `-X:priv_password` are used to authenticate the request. `.1.3.6.1.2.1.1.6.0` is the Object Identifier (OID), and `x “malicious_string”` represents the malicious payload. A successful execution of this command could trigger the vulnerability and cause the targeted device to restart, thereby inducing a DoS condition.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview This report delves into a substantial vulnerability located within the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS XE Software. The vulnerability, identified as CVE-2025-20312, could potentially enable an authenticated, remote attacker to instigate a Denial of Service (DoS) condition on an affected device. This issue is of significant importance due to its […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[],"tags":[],"vendor":[],"product":[],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-85921","post","type-post","status-publish","format-standard","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t