Buffer overflow in Cisco Nx-Os Software
CVE-2021-1590
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.014 (71.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 71.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-log… (vendor-advisory, Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-1590?
- CVE-2021-1590 is a medium-severity vulnerability in Cisco Nx-Os Software, classified under Out-of-bounds Write. CVSS score: 5.3/10. Published 2021-08-25.
- How severe is CVE-2021-1590?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2021-1590 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.