#VU25659 Input validation error in Cisco Systems, Inc products - CVE-2020-3170

Vulnerability identifier: #VU25659

Vulnerability 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-2020-3170

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

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 7000 Series Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to incorrect validation of the HTTP header of a request that is sent to the NX-API. A remote attacker can send a specially crafted HTTP request and cause a denial of service condition in the NX-API service.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco NX-OS: before 8.2.5

Cisco MDS 9000 Series Multilayer Switches: All versions

Cisco Nexus 7000 Series Switches: All versions

---

External links
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200226-nxos-api-dos

---

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.