What is CVE-2021-1387?

CVE-2021-1387 is a high-severity vulnerability in Cisco Nx-Os Software, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 8.6/10. Published 2021-02-24.

How severe is CVE-2021-1387?

High severity. CVSS v3 base score is 8.6 out of 10.

Vulnerability in Cisco Nx-Os Software

CVE-2021-1387

A vulnerability in the network stack of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability exists because the software improperly releases resources when it processes certain IPv6 packets that are destined to an affected device. An attacker could exploit this vulnerability by sending multiple crafted IPv6 packets to an affected device. A successful exploit could cause the network stack to run out of available buffers, impairing operations of control plane and management plane protocols and resulting in a DoS condition. Manual intervention would be required to restore normal operations on the affected device. For more information about the impact of this vulnerability, see the Details section of this advisory.

EPSS: 0.014 (70.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.

Affected products

Weakness classification (CWE)

CWE-401 — Missing Release of Memory after Effective Lifetime

References

psirt@cisco.com (x_refsource_CISCO, vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2021-1387?: CVE-2021-1387 is a high-severity vulnerability in Cisco Nx-Os Software, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 8.6/10. Published 2021-02-24.
How severe is CVE-2021-1387?: High severity. CVSS v3 base score is 8.6 out of 10.