Strix
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CVE-2023-20187

HIGHCVSS 7.5/10EPSS 0.65%

Last modified

CVE-2023-20187 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A vulnerability in the Multicast Leaf Recycle Elimination (mLRE) feature of Cisco IOS XE Software for Cisco ASR 1000 Series Aggregation Services Routers could allow an unauthenticated, remote attacker to cause the affected device to reload, resulting in a denial of service (DoS) condition. This vulnerability is due to incorrect handling of certain IPv6 multicast packets when they are fanned out more than seven times on an affected device. EPSS estimates a 0.65% chance of exploitation in the next 30 days.

Description

A vulnerability in the Multicast Leaf Recycle Elimination (mLRE) feature of Cisco IOS XE Software for Cisco ASR 1000 Series Aggregation Services Routers could allow an unauthenticated, remote attacker to cause the affected device to reload, resulting in a denial of service (DoS) condition. This vulnerability is due to incorrect handling of certain IPv6 multicast packets when they are fanned out more than seven times on an affected device. An attacker could exploit this vulnerability by sending a specific IPv6 multicast or IPv6 multicast VPN (MVPNv6) packet through the affected device. A successful exploit could allow the attacker to cause a reload of the affected device, resulting in a DoS condition.

Metrics

CVSS 3.1
7.5/10

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

EPSS Probability
0.65%

46.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoIos Xe3.7.1s
CiscoIos Xe3.7.2s
CiscoIos Xe3.7.2ts
CiscoIos Xe3.7.3s
CiscoIos Xe3.7.4s
CiscoIos Xe3.7.5s
CiscoIos Xe3.7.6s
CiscoIos Xe3.7.7s
CiscoIos Xe3.8.0s
CiscoIos Xe3.8.1s
CiscoIos Xe3.8.2s
CiscoIos Xe3.9.0s
CiscoIos Xe3.9.1s
CiscoIos Xe3.9.2s
CiscoIos Xe3.10.0s
CiscoIos Xe3.10.1s
CiscoIos Xe3.10.1xbs
CiscoIos Xe3.10.2s
CiscoIos Xe3.10.3s
CiscoIos Xe3.10.4s
CiscoIos Xe3.10.5s
CiscoIos Xe3.10.6s
CiscoIos Xe3.10.7s
CiscoIos Xe3.10.8as
CiscoIos Xe3.10.8s
CiscoIos Xe3.10.9s
CiscoIos Xe3.10.10s
CiscoIos Xe3.11.0s
CiscoIos Xe3.11.1s
CiscoIos Xe3.11.2s
CiscoIos Xe3.11.3s
CiscoIos Xe3.11.4s
CiscoIos Xe3.12.0s
CiscoIos Xe3.12.1s
CiscoIos Xe3.12.2s
CiscoIos Xe3.12.3s
CiscoIos Xe3.12.4s
CiscoIos Xe3.13.0s
CiscoIos Xe3.13.1s
CiscoIos Xe3.13.2as
CiscoIos Xe3.13.2s
CiscoIos Xe3.13.3s
CiscoIos Xe3.13.4s
CiscoIos Xe3.13.5as
CiscoIos Xe3.13.5s
CiscoIos Xe3.13.6as
CiscoIos Xe3.13.6s
CiscoIos Xe3.13.7s
CiscoIos Xe3.13.8s
CiscoIos Xe3.13.9s

Showing 50 of 201 affected configurations. See NVD for the full list.

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2023-20187?
A vulnerability in the Multicast Leaf Recycle Elimination (mLRE) feature of Cisco IOS XE Software for Cisco ASR 1000 Series Aggregation Services Routers could allow an unauthenticated, remote attacker to cause the affected device to reload, resulting in a denial of service (DoS) condition. This vulnerability is due to incorrect handling of certain IPv6 multicast packets when they are fanned out more than seven times on an affected device. An attacker could exploit this vulnerability by sending a specific IPv6 multicast or IPv6 multicast VPN (MVPNv6) packet through the affected device. A successful exploit could allow the attacker to cause a reload of the affected device, resulting in a DoS condition.
How severe is CVE-2023-20187?
CVE-2023-20187 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.65% probability of exploitation in the next 30 days.
How do I fix CVE-2023-20187?
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-2023-20187?

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

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Source: NVD / NIST