CVE-2024-20373: Cisco IOS and Cisco IOS XE SNMP Extended ACL Bypass Vulnerability
First published: Fri Nov 15 2024(Updated: )
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.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS | ||
| Cisco IOS XE Software |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2024-20373?
The severity of CVE-2024-20373 is considered high due to the potential for an unauthenticated remote attacker to perform SNMP polling.
How do I fix CVE-2024-20373?
To fix CVE-2024-20373, update the affected Cisco IOS and IOS XE Software to the latest version as recommended by Cisco.
Which devices are affected by CVE-2024-20373?
CVE-2024-20373 affects devices running Cisco IOS Software and Cisco IOS XE Software that utilize the SNMP IPv4 ACL feature.
Can CVE-2024-20373 be exploited remotely?
Yes, CVE-2024-20373 can be exploited remotely by unauthenticated attackers without requiring physical access to the device.
What impact does CVE-2024-20373 have on device security?
CVE-2024-20373 can compromise device security by allowing unauthorized SNMP polling, potentially exposing sensitive information.
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