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CVE-2024-20373

MEDIUMCVSS 5.3/10EPSS 0.51%

Last modified

CVE-2024-20373 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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. EPSS estimates a 0.51% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
5.3/10

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

EPSS Probability
0.51%

39.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoIos Xe Sd-Wan16.9.3
CiscoIos Xe Sd-Wan16.9.4
CiscoIos Xe Sd-Wan16.10.1
CiscoIos Xe Sd-Wan16.10.2
CiscoIos Xe Sd-Wan16.10.3
CiscoIos Xe Sd-Wan16.10.3a
CiscoIos Xe Sd-Wan16.10.3b
CiscoIos Xe Sd-Wan16.10.4
CiscoIos Xe Sd-Wan16.10.5
CiscoIos Xe Sd-Wan16.10.6
CiscoIos Xe Sd-Wan16.11.1
CiscoIos Xe Sd-Wan16.11.1a
CiscoIos Xe Sd-Wan16.11.1b
CiscoIos Xe Sd-Wan16.11.1d
CiscoIos Xe Sd-Wan16.11.1f
CiscoIos Xe Sd-Wan16.11.1s
CiscoIos Xe Sd-Wan16.12.1
CiscoIos Xe Sd-Wan16.12.3
CiscoIos Xe Sd-Wan16.12.4
CiscoIos Xe Sd-Wan16.12.5

References

Timeline

Published
Last Modified
Status
Analyzed

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.
How severe is CVE-2024-20373?
CVE-2024-20373 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.51% probability of exploitation in the next 30 days.
How do I fix CVE-2024-20373?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2024-20373?

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Source: NVD / NIST