CVE-2020-3511 : A vulnerability in the ISDN subsystem of Cisco IOS Software and Cisco IOS XE Sof

A vulnerability in the ISDN subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to cause a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to insufficient input validation when the ISDN Q.931 messages are processed. An attacker could exploit this vulnerability by sending a malicious ISDN Q.931 message to an affected device. A successful exploit could allow the attacker to cause the process to crash, resulting in a reload of the affected device.

Published 2020-09-24 18:15:21

Updated 2023-05-23 13:55:46

Source Cisco Systems, Inc.

View at NVD, CVE.org

Vulnerability category: Input validationDenial of service

Products affected by CVE-2020-3511

Cisco » Ios Xe » Version: 15.1(4)m
cpe:2.3:o:cisco:ios_xe:15.1\(4\)m:*:*:*:*:*:*:*
Matching versions
When used together with: Cisco » 1100-4g Integrated Services Router » Version: N/A
When used together with: Cisco » 1100-4gltegb Integrated Services Router » Version: N/A
When used together with: Cisco » 1100-4gltena Integrated Services Router » Version: N/A
When used together with: Cisco » 1100-4p Integrated Services Router » Version: N/A
When used together with: Cisco » 1100-6g Integrated Services Router » Version: N/A
When used together with: Cisco » 1100-8p Integrated Services Router » Version: N/A
When used together with: Cisco » 1100-lte Integrated Services Router » Version: N/A
When used together with: Cisco » 1100 Integrated Services Router » Version: N/A
When used together with: Cisco » 1101-4p Integrated Services Router » Version: N/A
When used together with: Cisco » 1101 Integrated Services Router » Version: N/A
When used together with: Cisco » 1109-2p Integrated Services Router » Version: N/A
When used together with: Cisco » 1109-4p Integrated Services Router » Version: N/A
When used together with: Cisco » 1109 Integrated Services Router » Version: N/A
When used together with: Cisco » 1111x-8p Integrated Services Router » Version: N/A
When used together with: Cisco » 1111x Integrated Services Router » Version: N/A
When used together with: Cisco » 111x Integrated Services Router » Version: N/A
When used together with: Cisco » 1120 Integrated Services Router » Version: N/A
When used together with: Cisco » 1160 Integrated Services Router » Version: N/A
When used together with: Cisco » 422 Integrated Services Router » Version: N/A
When used together with: Cisco » 4321/k9-rf Integrated Services Router » Version: N/A
When used together with: Cisco » 4321/k9-ws Integrated Services Router » Version: N/A
When used together with: Cisco » 4321/k9 Integrated Services Router » Version: N/A
When used together with: Cisco » 4331/k9-rf Integrated Services Router » Version: N/A
When used together with: Cisco » 4331/k9-ws Integrated Services Router » Version: N/A
When used together with: Cisco » 4331/k9 Integrated Services Router » Version: N/A
When used together with: Cisco » 4351/k9-rf Integrated Services Router » Version: N/A
When used together with: Cisco » 4351/k9-ws Integrated Services Router » Version: N/A
When used together with: Cisco » 4351/k9 Integrated Services Router » Version: N/A
When used together with: Cisco » 4431 Integrated Services Router » Version: N/A
When used together with: Cisco » 4461 Integrated Services Router » Version: N/A
When used together with: Cisco » Asr 1000-x » Version: N/A
When used together with: Cisco » Asr 1001 » Version: N/A
When used together with: Cisco » Asr 1001-x » Version: N/A
When used together with: Cisco » Asr 1002 » Version: N/A
When used together with: Cisco » Asr 1002-x » Version: N/A
When used together with: Cisco » Asr 1004 » Version: N/A
When used together with: Cisco » Asr 1006 » Version: N/A
When used together with: Cisco » Asr 1013 » Version: N/A
When used together with: Cisco » Asr1001-hx » Version: N/A
When used together with: Cisco » Asr1001-hx-rf » Version: N/A
When used together with: Cisco » Asr1001-x » Version: N/A
When used together with: Cisco » Asr1001-x-rf » Version: N/A
When used together with: Cisco » Asr1001-x-ws » Version: N/A
When used together with: Cisco » Asr1002-hx » Version: N/A
When used together with: Cisco » Asr1002-hx-rf » Version: N/A
When used together with: Cisco » Asr1002-hx-ws » Version: N/A
When used together with: Cisco » Asr1002-x » Version: N/A
When used together with: Cisco » Asr1002-x-rf » Version: N/A
When used together with: Cisco » Asr1002-x-ws » Version: N/A
When used together with: Cisco » Csr1000v » Version: N/A

Exploit prediction scoring system (EPSS) score for CVE-2020-3511

EPSS FAQ

0.06%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 23 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2020-3511

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
6.1	MEDIUM	AV:A/AC:L/Au:N/C:N/I:N/A:C	6.5	6.9	NIST
Access Vector: Adjacent Network Access Complexity: Low Authentication: None Confidentiality Impact: None Integrity Impact: None Availability Impact: Complete
7.4	HIGH	CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H	2.8	4.0	Cisco Systems, Inc.
Attack Vector: Adjacent Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Changed Confidentiality: None Integrity: None Availability: High
7.4	HIGH	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H	2.8	4.0	NIST
Attack Vector: Adjacent Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Changed Confidentiality: None Integrity: None Availability: High

CWE ids for CVE-2020-3511

CWE-20 Improper Input Validation

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
Assigned by:
- nvd@nist.gov (Primary)
- ykramarz@cisco.com (Secondary)

References for CVE-2020-3511

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-isdn-q931-dos-67eUZBTf

Cisco IOS and IOS XE Software ISDN Q.931 Denial of Service Vulnerability
Vendor Advisory

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Vulnerability Details : CVE-2020-3511

Products affected by CVE-2020-3511

Exploit prediction scoring system (EPSS) score for CVE-2020-3511

CVSS scores for CVE-2020-3511

CWE ids for CVE-2020-3511

References for CVE-2020-3511