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CVE-2023-20187

HIGH
Published 2023-09-27T17:19:44.488Z
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CVSS Score

V3.1
8.6
/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.004
probability
of exploitation in the wild

There is a 0.4% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.583
Higher than 58.3% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED

Impact Metrics

Confidentiality
NONE
Integrity
NONE
Availability
HIGH

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.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

Cisco

Cisco IOS XE Software

Affected Versions:

3.7.1S 3.7.2S 3.7.3S 3.7.4S 3.7.5S 3.7.6S 3.7.7S 3.7.2tS 3.8.0S 3.8.1S 3.8.2S 3.9.1S 3.9.0S 3.9.2S 3.10.0S 3.10.1S 3.10.2S 3.10.3S 3.10.4S 3.10.5S 3.10.6S 3.10.7S 3.10.1xbS 3.10.8S 3.10.8aS 3.10.9S 3.10.10S 3.11.1S 3.11.2S 3.11.0S 3.11.3S 3.11.4S 3.12.0S 3.12.1S 3.12.2S 3.12.3S 3.12.4S 3.13.0S 3.13.1S 3.13.2S 3.13.3S 3.13.4S 3.13.5S 3.13.2aS 3.13.5aS 3.13.6S 3.13.7S 3.13.6aS 3.13.8S 3.13.9S 3.13.10S 3.14.0S 3.14.1S 3.14.2S 3.14.3S 3.14.4S 3.15.0S 3.15.1S 3.15.2S 3.15.3S 3.15.4S 3.16.0S 3.16.1aS 3.16.2S 3.16.3S 3.16.2bS 3.16.4aS 3.16.4bS 3.16.5S 3.16.6S 3.16.7S 3.16.6bS 3.16.7aS 3.16.7bS 3.16.8S 3.16.9S 3.16.10S 3.17.0S 3.17.1S 3.17.2S 3.17.1aS 3.17.3S 3.17.4S 16.2.1 16.2.2 16.3.1 16.3.2 16.3.3 16.3.1a 16.3.4 16.3.5 16.3.6 16.3.7 16.3.8 16.3.9 16.3.10 16.3.11 16.4.1 16.4.2 16.4.3 16.5.1 16.5.1b 16.5.2 16.5.3 16.6.1 16.6.2 16.6.3 16.6.4 16.6.5 16.6.6 16.6.7 16.6.8 16.6.9 16.6.10 16.7.1 16.7.2 16.7.3 16.8.1 16.8.1s 16.8.2 16.8.3 16.9.1 16.9.2 16.9.1s 16.9.3 16.9.4 16.9.5 16.9.6 16.9.7 16.9.8 16.10.1 16.10.1a 16.10.1s 16.10.1e 16.10.2 16.10.3 16.11.1 16.11.1a 16.11.2 16.11.1s 16.12.1 16.12.1s 16.12.1a 16.12.1c 16.12.2 16.12.3 16.12.8 16.12.2s 16.12.4 16.12.3s 16.12.5 16.12.6 16.12.7 16.12.10a 17.1.1 17.1.1s 17.1.1t 17.1.3 17.2.1 17.2.1r 17.2.1v 17.2.2 17.2.3 17.3.1 17.3.2 17.3.3 17.3.1a 17.3.4 17.3.5 17.3.4a 17.3.6 17.3.7 17.4.1 17.4.2 17.4.1a 17.4.1b 17.5.1 17.5.1a 17.5.1b 17.5.1c 17.6.1 17.6.2 17.6.1a 17.6.3 17.6.3a 17.6.4 17.6.5 17.6.5a 17.7.1 17.7.1a 17.7.2 17.10.1 17.10.1a 17.8.1 17.8.1a 17.9.1 17.9.2 17.9.1a 17.9.3 17.9.2a 17.9.3a 17.11.1 17.11.1a

EU Vulnerability Database

Monitored by ENISA for EU cybersecurity

EU Coordination

EU Coordinated

Exploitation Status

No Known Exploitation

EUVD ID

View on ENISA

ENISA Analysis

Malicious code in bioql (PyPI)

Affected Products (ENISA)

cisco
cisco ios xe software

ENISA Scoring

CVSS Score (3.1)

8.6
/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

EPSS Score

0.380
probability

ENISA References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-mlre-H93FswRz

Data provided by ENISA EU Vulnerability Database. Last updated: October 3, 2025

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

⚠ Unreviewed HIGH

GHSA-w9wf-g769-rjv3

Advisory Details

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.

CVSS Scoring

CVSS Score

7.5

CVSS Vector

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

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2023-20187
WEB https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-mlre-H93FswRz

Advisory provided by GitHub Security Advisory Database. Published: September 27, 2023, Modified: January 25, 2024

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-mlre-H93FswRz
Published: 2023-09-27T17:19:44.488Z
Last Modified: 2024-08-02T09:05:36.976Z
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