CVE-2021-1590: medium-severity vulnerability in Cisco NX-OS Software
Cisco NX-OS Software system login block-for Denial of Service Vulnerability
Published · Updated
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.3epss 1.4%
A vulnerability in the implementation of the system login block-for command for Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a login process to unexpectedly restart, causing a denial of service (DoS) condition. This vulnerability is due to a logic error in the implementation of the system login block-for command when an attack is detected and acted upon. An attacker could exploit this vulnerability by performing a brute-force login attack on an affected device. A successful exploit could allow the attacker to cause a login process to reload, which could result in a delay during authentication to the affected device.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Affected products
Cisco · Cisco NX-OS SoftwareRelated CVEs — Cisco NX-OS Software
In the same product, most dangerous first.
CVE-2024-20399MEDIUMCisco NX-OS Software CLI Command Injection VulnerabilityEPSS 4.3%KEVCVE-2022-20650HIGHCisco NX-OS Software NX-API Command Injection VulnerabilityEPSS 14.5%CVE-2022-20624HIGHCisco NX-OS Software Cisco Fabric Services Over IP Denial of Service VulnerabilityEPSS 12.4%CVE-2022-20623HIGHCisco Nexus 9000 Series Switches Bidirectional Forwarding Detection Denial of Service VulnerabilityEPSS 11.9%CVE-2026-76455CRITICALCisco NX-OS Software Security Hardening Release: October 2026 - Improper Access Control VulnerabilitiesEPSS 4.0%CVE-2022-20625MEDIUMCisco FXOS and NX-OS Software Cisco Discovery Protocol Service Denial of Service VulnerabilityEPSS 3.3%