PT-2021-5245 · Cisco · Cisco Nx-Os+1

Published 2021-08-25 · Updated 2021-09-05 · CVE-2021-1590

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Name of the Vulnerable Software and Affected Versions Cisco NX-OS Software (affected versions not specified)

Description A vulnerability in the implementation of the system login block-for command could allow an unauthenticated, remote attacker to cause a login process to unexpectedly restart, causing a denial of service (DoS) condition. This 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 by performing a brute-force login attack on an affected device, potentially causing a delay during authentication.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

BDU:2021-06049

CVE-2021-1590

Affected Products

Cisco Nx-Os

Cisco Nexus

References · 8

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-login-blockfor-RwjGVEcu · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-1590 · Security Note
• https://osv.dev/vulnerability/CVE-2021-1590 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-06049 · Security Note
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-login-blockfor-RwjGVEcu · Vendor Advisory
• https://t.me/cvenotify/20629 · Telegram Post
• https://t.me/cybersecuritytechnologies/4232 · Telegram Post
• https://t.me/cvenotify/20101 · Telegram Post