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CVE-2020-3496

MEDIUMCVSS 5.3/10EPSS 1.74%

Last modified

CVE-2020-3496 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. A vulnerability in the IPv6 packet processing engine of Cisco Small Business Smart and Managed Switches could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to insufficient validation of incoming IPv6 traffic. EPSS estimates a 1.74% chance of exploitation in the next 30 days.

Description

A vulnerability in the IPv6 packet processing engine of Cisco Small Business Smart and Managed Switches could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to insufficient validation of incoming IPv6 traffic. An attacker could exploit this vulnerability by sending a crafted IPv6 packet through an affected device. A successful exploit could allow the attacker to cause the switch management CLI to stop responding, resulting in a DoS condition. This vulnerability is specific to IPv6 traffic. IPv4 traffic is not affected.

Metrics

CVSS 3.1
5.3/10

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

EPSS Probability
1.74%

74.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoSg200-50 Firmware<= 2.5.5.47
CiscoSg200-50p Firmware<= 2.5.5.47
CiscoSg200-50fp Firmware<= 2.5.5.47
CiscoSg200-26 Firmware<= 2.5.5.47
CiscoSg200-26p Firmware<= 2.5.5.47
CiscoSg200-26fp Firmware<= 2.5.5.47
CiscoSg200-18 Firmware<= 2.5.5.47
CiscoSg200-10fp Firmware<= 2.5.5.47
CiscoSg200-08 Firmware<= 2.5.5.47
CiscoSg200-08p Firmware<= 2.5.5.47
CiscoSf200-24 Firmware<= 2.5.5.47
CiscoSf200-24p Firmware<= 2.5.5.47
CiscoSf200-24fp Firmware<= 2.5.5.47
CiscoSf200-48 Firmware<= 2.5.5.47
CiscoSf200-48p Firmware<= 2.5.5.47
CiscoSf302-08pp Firmware<= 2.5.5.47
CiscoSf302-08mpp Firmware<= 2.5.5.47
CiscoSg300-10pp Firmware<= 2.5.5.47
CiscoSg300-10mpp Firmware<= 2.5.5.47
CiscoSf300-24pp Firmware<= 2.5.5.47
CiscoSf300-48pp Firmware<= 2.5.5.47
CiscoSg300-28pp Firmware<= 2.5.5.47
CiscoSf300-08 Firmware<= 2.5.5.47
CiscoSf300-48p Firmware<= 2.5.5.47
CiscoSg300-10mp Firmware<= 2.5.5.47
CiscoSg300-10p Firmware<= 2.5.5.47
CiscoSg300-10 Firmware<= 2.5.5.47
CiscoSg300-28p Firmware<= 2.5.5.47
CiscoSf300-24p Firmware<= 2.5.5.47
CiscoSf302-08mp Firmware<= 2.5.5.47
CiscoSg300-28 Firmware<= 2.5.5.47
CiscoSf300-48 Firmware<= 2.5.5.47
CiscoSg300-20 Firmware<= 2.5.5.47
CiscoSf302-08p Firmware<= 2.5.5.47
CiscoSg300-52 Firmware<= 2.5.5.47
CiscoSf300-24 Firmware<= 2.5.5.47
CiscoSf302-08 Firmware<= 2.5.5.47
CiscoSf300-24mp Firmware<= 2.5.5.47
CiscoSg300-10sfp Firmware<= 2.5.5.47
CiscoSg300-28mp Firmware<= 2.5.5.47
CiscoSg300-52p Firmware<= 2.5.5.47
CiscoSg300-52mp Firmware<= 2.5.5.47
CiscoSg500-28mpp Firmware<= 2.5.5.47
CiscoSg500-52mp Firmware<= 2.5.5.47
CiscoSg500xg-8f8t Firmware<= 2.5.5.47
CiscoSf500-24 Firmware<= 2.5.5.47
CiscoSf500-24p Firmware<= 2.5.5.47
CiscoSf500-48 Firmware<= 2.5.5.47
CiscoSf500-48p Firmware<= 2.5.5.47
CiscoSg500-28 Firmware<= 2.5.5.47

Showing 50 of 114 affected configurations. See NVD for the full list.

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2020-3496?
A vulnerability in the IPv6 packet processing engine of Cisco Small Business Smart and Managed Switches could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to insufficient validation of incoming IPv6 traffic. An attacker could exploit this vulnerability by sending a crafted IPv6 packet through an affected device. A successful exploit could allow the attacker to cause the switch management CLI to stop responding, resulting in a DoS condition. This vulnerability is specific to IPv6 traffic. IPv4 traffic is not affected.
How severe is CVE-2020-3496?
CVE-2020-3496 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 1.74% probability of exploitation in the next 30 days.
How do I fix CVE-2020-3496?
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-2020-3496?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST