Denial of service in Cisco NX-OS Software
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2021-1590 |
| CWE-ID | CWE-119 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software |
Cisco NX-OS Operating systems & Components / Operating system Cisco MDS 9000 Series Multilayer Switches Hardware solutions / Routers & switches, VoIP, GSM, etc Cisco Nexus 3000 Series Switches Hardware solutions / Routers & switches, VoIP, GSM, etc Nexus 5500 Platform Switches Hardware solutions / Routers & switches, VoIP, GSM, etc Nexus 5600 Platform Switches Hardware solutions / Routers & switches, VoIP, GSM, etc Cisco Nexus 6000 Series Switches Hardware solutions / Routers & switches, VoIP, GSM, etc Cisco Nexus 7000 Series Switches Hardware solutions / Routers & switches, VoIP, GSM, etc Cisco Nexus 9000 Series Switches NX-OS Mode Hardware solutions / Routers & switches, VoIP, GSM, etc UCS 6200 Series Fabric Interconnects Hardware solutions / Routers & switches, VoIP, GSM, etc UCS 6300 Series Fabric Interconnects Hardware solutions / Routers & switches, VoIP, GSM, etc |
| Vendor | Cisco Systems, Inc |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
1) Buffer overflow
EUVDB-ID: #VU56116
Risk: Medium
CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2021-1590
CWE-ID:
CWE-119 - Memory corruption
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error in the implementation of the system login block-for command. A remote attacker can trigger memory corruption and cause a denial of service condition on the target system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsCisco NX-OS: All versions
Cisco MDS 9000 Series Multilayer Switches: 7.0.3 I4.0.116
Cisco Nexus 3000 Series Switches: 7.0.3 I4.0.116
Nexus 5500 Platform Switches: 7.3.7 N1.1b
Nexus 5600 Platform Switches: 7.3.7 N1.1b
Cisco Nexus 6000 Series Switches: 7.3.7 N1.1b
Cisco Nexus 7000 Series Switches: 7.0.3 I4.0.116
Cisco Nexus 9000 Series Switches NX-OS Mode: 7.0.3 I4.0.116
UCS 6200 Series Fabric Interconnects: 4.0 - 4.1
UCS 6300 Series Fabric Interconnects: 4.0 - 4.1
CPE2.3- cpe:2.3:o:cisco_systems:cisco_nx-os:*:*:*:*:*:*:*:*
- cpe:2.3:h:cisco_systems:cisco_mds_9000_series_multilayer_switches:7.0.3 I4.0.116:*:*:*:*:*:*:*
- cpe:2.3:h:cisco_systems:cisco_nexus_3000_series_switches:7.0.3 I4.0.116:*:*:*:*:*:*:*
- cpe:2.3:h:cisco_systems:nexus_5500_platform_switches:7.3.7 N1.1b:*:*:*:*:*:*:*
- cpe:2.3:h:cisco_systems:nexus_5600_platform_switches:7.3.7 N1.1b:*:*:*:*:*:*:*
- cpe:2.3:h:cisco_systems:cisco_nexus_6000_series_switches:7.3.7 N1.1b:*:*:*:*:*:*:*
- cpe:2.3:h:cisco_systems:cisco_nexus_7000_series_switches:7.0.3 I4.0.116:*:*:*:*:*:*:*
- cpe:2.3:h:cisco_systems:cisco_nexus_9000_series_switches_nx-os_mode:7.0.3 I4.0.116:*:*:*:*:*:*:*
- cpe:2.3:h:cisco_systems:ucs_6200_series_fabric_interconnects:*:*:*:*:*:*:*:*
- cpe:2.3:h:cisco_systems:ucs_6200_series_fabric_interconnects:4.0:*:*:*:*:*:*:*
- cpe:2.3:h:cisco_systems:ucs_6300_series_fabric_interconnects:*:*:*:*:*:*:*:*
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
