CVE-2024-20373

MEDIUM
Published Nov 15, 2024 Modified Aug 1, 2025 CWE-284

Description

A vulnerability in the implementation of the Simple Network Management Protocol (SNMP) IPv4 access control list (ACL) feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to perform SNMP polling of an affected device, even if it is configured to deny SNMP traffic.  This vulnerability exists because Cisco IOS Software and Cisco IOS XE Software do not support extended IPv4 ACLs for SNMP, but they do allow administrators to configure extended named IPv4 ACLs that are attached to the SNMP server configuration without a warning message. This can result in no ACL being applied to the SNMP listening process. An attacker could exploit this vulnerability by performing SNMP polling of an affected device. A successful exploit could allow the attacker to perform SNMP operations that should be denied. The attacker has no control of the SNMP ACL configuration and would still need a valid SNMP version 2c (SNMPv2c) community string or SNMP version 3 (SNMPv3) user credentials. SNMP with IPv6 ACL configurations is not affected. For more information, see the section of this advisory.

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CVSS v3.1 Score

5.3
MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Weakness Type (CWE)

CWE-284 CWE-284

Affected Products

Vendor Product
cisco ios_xe_sd-wan
cisco ios_xe_sd-wan
cisco ios_xe_sd-wan
cisco ios_xe_sd-wan
cisco ios_xe_sd-wan
cisco ios_xe_sd-wan
cisco ios_xe_sd-wan
cisco ios_xe_sd-wan
cisco ios_xe_sd-wan
cisco ios_xe_sd-wan
cisco ios_xe_sd-wan
cisco ios_xe_sd-wan
cisco ios_xe_sd-wan
cisco ios_xe_sd-wan
cisco ios_xe_sd-wan
cisco ios_xe_sd-wan
cisco ios_xe_sd-wan
cisco ios_xe_sd-wan
cisco ios_xe_sd-wan
cisco ios_xe_sd-wan

References

Frequently Asked Questions

What is CVE-2024-20373? +
A vulnerability in the implementation of the Simple Network Management Protocol (SNMP) IPv4 access control list (ACL) feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to perform SNMP polling of an affected device, even if it is configured to deny SNMP traffic.  This vulnerability exists because Cisco IOS Software and Cisco IOS XE Software do not support extended IPv4 ACLs for SNMP, but they do allow administrators to configure extended named IPv4 ACLs that are attached to the SNMP server configuration without a warning message. This can result in no ACL being applied to the SNMP listening process. An attacker could exploit this vulnerability by performing SNMP polling of an affected device. A successful exploit could allow the attacker to perform SNMP operations that should be denied. The attacker has no control of the SNMP ACL configuration and would still need a valid SNMP version 2c (SNMPv2c) community string or SNMP version 3 (SNMPv3) user credentials. SNMP with IPv6 ACL configurations is not affected. For more information, see the section of this advisory. It has a CVSS v3.1 base score of 5.3 (MEDIUM).
How severe is CVE-2024-20373? +
CVE-2024-20373 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.
What products are affected by CVE-2024-20373? +
CVE-2024-20373 affects products from cisco, specifically: ios_xe_sd-wan. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2024-20373? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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