High severity · published Feb 24, 2021
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
8.6
CVSS
1.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)1.4% · higher than 73% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NX
Nx-os · Cisco
7.0(0)n1(1); 7.0(1)n1(1); 7.0(2)n1(1); 7.0(3)n1(1); 7.0(4)n1(1); 7.0(4)n1(1a); +34 more · source: NVD
UC
Unified Computing System · Cisco
4.0 before 4.0\(4k\); 4.1 before 4.1\(1e\) · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-1387
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-1387
Vendor Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-ipv6-netstack-edXPGV7K
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