8.6
HIGH
CVE-2023-20227
Cisco L2TP Denial of Service Vulnerability
Description

A vulnerability in the Layer 2 Tunneling Protocol (L2TP) feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper handling of certain L2TP packets. An attacker could exploit this vulnerability by sending crafted L2TP packets to an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly, resulting in a DoS condition. Note: Only traffic directed to the affected system can be used to exploit this vulnerability.

INFO

Published Date :

Sept. 27, 2023, 6:15 p.m.

Last Modified :

Nov. 21, 2024, 7:40 a.m.

Remotely Exploitable :

Yes !

Impact Score :

4.0

Exploitability Score :

3.9
Affected Products

The following products are affected by CVE-2023-20227 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Cisco ios_xe
2 Cisco 1100-4g_integrated_services_router
3 Cisco 1100-4gltegb_integrated_services_router
4 Cisco 1100-4gltena_integrated_services_router
5 Cisco 1100-6g_integrated_services_router
6 Cisco 4221_integrated_services_router
7 Cisco catalyst_8300-1n1s-4t2x
8 Cisco catalyst_8300-1n1s-6t
9 Cisco catalyst_8300-2n2s-4t2x
10 Cisco catalyst_8300-2n2s-6t
11 Cisco 1000_integrated_services_router
12 Cisco 4321\/k9-rf_integrated_services_router
13 Cisco 4321\/k9-ws_integrated_services_router
14 Cisco 4321\/k9_integrated_services_router
15 Cisco 4321_integrated_services_router
16 Cisco 4331\/k9-rf_integrated_services_router
17 Cisco 4331\/k9-ws_integrated_services_router
18 Cisco 4331\/k9_integrated_services_router
19 Cisco 4331_integrated_services_router
20 Cisco 4351\/k9-rf_integrated_services_router
21 Cisco 4351\/k9-ws_integrated_services_router
22 Cisco 4351\/k9_integrated_services_router
23 Cisco 4351_integrated_services_router
24 Cisco 4431_integrated_services_router
25 Cisco 4451_integrated_services_router
26 Cisco 4461_integrated_services_router
27 Cisco cloud_services_router_1000v
28 Cisco c8200-1n-4t
29 Cisco c8200l-1n-4t
30 Cisco catalyst_8000v_edge
31 Cisco c8500l-8s4x
32 Cisco vg400-2fxs\/2fxo
33 Cisco vg400-4fxs\/4fxo
34 Cisco vg400-6fxs\/6fxo
35 Cisco vg400-8fxs
36 Cisco vg420-132fxs\/6fxo
37 Cisco vg420-144fxs
38 Cisco vg420-84fxs\/6fxo
39 Cisco vg450-144fxs\/k9
40 Cisco vg450-72fxs\/k9
41 Cisco vg450\/k9
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2023-20227.

URL Resource
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-xe-l2tp-dos-eB5tuFmV Mitigation Vendor Advisory
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-xe-l2tp-dos-eB5tuFmV Mitigation Vendor Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2023-20227 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2023-20227 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-xe-l2tp-dos-eB5tuFmV
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Jan. 25, 2024

    Action Type Old Value New Value
    Added CWE Cisco Systems, Inc. CWE-388
  • Initial Analysis by [email protected]

    Oct. 06, 2023

    Action Type Old Value New Value
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    Changed Reference Type https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-xe-l2tp-dos-eB5tuFmV No Types Assigned https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-xe-l2tp-dos-eB5tuFmV Mitigation, Vendor Advisory
    Added CWE NIST NVD-CWE-noinfo
    Added CPE Configuration AND OR *cpe:2.3:o:cisco:ios_xe:16.8.1:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.8.1a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.8.1b:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.8.1c:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.8.1d:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.8.1e:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.8.1s:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.8.2:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.8.3:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.9.1:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.9.1a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.9.1b:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.9.1s:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.9.2:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.9.3:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.9.4:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.9.5:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.9.5f:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.9.6:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.9.7:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.9.8:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.10.1:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.10.1a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.10.1b:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.10.1c:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.10.1d:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.10.1e:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.10.1f:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.10.1g:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.10.1s:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.10.2:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.10.3:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.11.1:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.11.1a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.11.1b:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.11.1s:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.11.2:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.1:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.1a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.1c:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.1s:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.1t:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.1w:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.1x:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.1y:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.1z1:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.1z2:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.2:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.2a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.2s:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.3:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.3s:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.4:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.4a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.5:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.5a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.6:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.6a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.7:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.8:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.1.1:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.1.1a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.1.1s:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.1.1t:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.1.3:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.2.1:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.2.1a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.2.1r:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.2.1v:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.2.2:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.2.3:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.3.1:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.3.1a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.3.1w:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.3.1x:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.3.1z:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.3.2:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.3.2a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.3.3:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.3.4:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.3.4a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.3.4c:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.3.5:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.3.5a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.3.5b:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.3.6:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.3.7:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.4.1:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.4.1a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.4.1b:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.4.2:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.4.2a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.5.1:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.5.1a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.5.1b:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.5.1c:*:*:*:*:*:*:* OR cpe:2.3:a:cisco:catalyst_8000v_edge:-:*:*:*:*:*:*:* cpe:2.3:a:cisco:cloud_services_router_1000v:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:1000_integrated_services_router:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:1100-4g_integrated_services_router:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:1100-4gltegb_integrated_services_router:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:1100-4gltena_integrated_services_router:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:1100-6g_integrated_services_router:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:4221_integrated_services_router:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:4321\/k9-rf_integrated_services_router:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:4321\/k9-ws_integrated_services_router:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:4321\/k9_integrated_services_router:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:4321_integrated_services_router:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:4331\/k9-rf_integrated_services_router:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:4331\/k9-ws_integrated_services_router:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:4331\/k9_integrated_services_router:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:4331_integrated_services_router:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:4351\/k9-rf_integrated_services_router:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:4351\/k9-ws_integrated_services_router:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:4351\/k9_integrated_services_router:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:4351_integrated_services_router:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:4431_integrated_services_router:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:4451_integrated_services_router:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:4461_integrated_services_router:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:c8200-1n-4t:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:c8200l-1n-4t:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:c8500l-8s4x:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:catalyst_8300-1n1s-4t2x:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:catalyst_8300-1n1s-6t:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:catalyst_8300-2n2s-4t2x:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:catalyst_8300-2n2s-6t:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:vg400-2fxs\/2fxo:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:vg400-4fxs\/4fxo:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:vg400-6fxs\/6fxo:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:vg400-8fxs:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:vg420-132fxs\/6fxo:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:vg420-144fxs:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:vg420-84fxs\/6fxo:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:vg450-144fxs\/k9:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:vg450-72fxs\/k9:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:vg450\/k9:-:*:*:*:*:*:*:*
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2023-20227 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2023-20227 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.12 }} 0.04%

score

0.46634

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability