CVE-2021-1523
CVSS V2 Medium 5
CVSS V3 High 8.6
Description
A vulnerability in Cisco Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) Mode could allow an unauthenticated, remote attacker to cause a queue wedge on a leaf switch, which could result in critical control plane traffic to the device being dropped. This could result in one or more leaf switches being removed from the fabric. This vulnerability is due to mishandling of ingress TCP traffic to a specific port. An attacker could exploit this vulnerability by sending a stream of TCP packets to a specific port on a Switched Virtual Interface (SVI) configured on the device. A successful exploit could allow the attacker to cause a specific packet queue to queue network buffers but never process them, leading to an eventual queue wedge. This could cause control plane traffic to be dropped, resulting in a denial of service (DoS) condition where the leaf switches are unavailable. Note: This vulnerability requires a manual intervention to power-cycle the device to recover.
Overview
- CVE ID
- CVE-2021-1523
- Assigner
- ykramarz@cisco.com
- Vulnerability Status
- Analyzed
- Published Version
- 2021-08-25T19:15:07
- Last Modified Date
- 2021-09-02T11:22:59
Weakness Enumerations
CPE Configuration (Product)
| CPE | Vulnerable | Operator | Version Start | Version End |
|---|---|---|---|---|
| AND | ||||
| cpe:2.3:o:cisco:nx-os:13.2\(3n\):*:*:*:*:*:*:* | 1 | OR | ||
| cpe:2.3:o:cisco:nx-os:14.2\(4i\):*:*:*:*:*:*:* | 1 | OR | ||
| cpe:2.3:h:cisco:nexus_93120tx:-:*:*:*:*:*:*:* | 0 | OR | ||
| cpe:2.3:h:cisco:nexus_93128tx:-:*:*:*:*:*:*:* | 0 | OR | ||
| cpe:2.3:h:cisco:nexus_9332pq:-:*:*:*:*:*:*:* | 0 | OR | ||
| cpe:2.3:h:cisco:nexus_9372px:-:*:*:*:*:*:*:* | 0 | OR | ||
| cpe:2.3:h:cisco:nexus_9372px-e:-:*:*:*:*:*:*:* | 0 | OR | ||
| cpe:2.3:h:cisco:nexus_9372tx:-:*:*:*:*:*:*:* | 0 | OR | ||
| cpe:2.3:h:cisco:nexus_9372tx-e:-:*:*:*:*:*:*:* | 0 | OR | ||
| cpe:2.3:h:cisco:nexus_9396px:-:*:*:*:*:*:*:* | 0 | OR | ||
| cpe:2.3:h:cisco:nexus_9396tx:-:*:*:*:*:*:*:* | 0 | OR |
CVSS Version 2
- Version
- 2.0
- Vector String
- AV:N/AC:L/Au:N/C:N/I:N/A:P
- Access Vector
- NETWORK
- Access Compatibility
- LOW
- Authentication
- NONE
- Confidentiality Impact
- NONE
- Integrity Impact
- NONE
- Availability Impact
- PARTIAL
- Base Score
- 5
- Severity
- MEDIUM
- Exploitability Score
- 10
- Impact Score
- 2.9
CVSS Version 3
- Version
- 3.1
- Vector String
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- Attack Vector
- NETWORK
- Attack Compatibility
- LOW
- Privileges Required
- NONE
- User Interaction
- NONE
- Scope
- CHANGED
- Confidentiality Impact
- NONE
- Availability Impact
- HIGH
- Base Score
- 8.6
- Base Severity
- HIGH
- Exploitability Score
- 3.9
- Impact Score
- 4
References
| Reference URL | Reference Tags |
|---|---|
| https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-n9kaci-queue-wedge-cLDDEfKF | Vendor Advisory |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2021-1523 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-1523 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-05-10 16:07:59 | Added to TrackCVE | |||
| 2022-12-05 09:03:49 | psirt@cisco.com | ykramarz@cisco.com | CVE Assigner | updated |
| 2022-12-05 09:03:49 | 2021-08-25T19:15Z | 2021-08-25T19:15:07 | CVE Published Date | updated |
| 2022-12-05 09:03:49 | 2021-09-02T11:22:59 | CVE Modified Date | updated | |
| 2022-12-05 09:03:49 | Analyzed | Vulnerability Status | updated |