#VU24523 Input validation error in Cisco IOS XR - CVE-2019-16027

Vulnerability identifier: #VU24523

Vulnerability risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-16027

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco IOS XR
Operating systems & Components / Operating system

Vendor: Cisco Systems, Inc

Description

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

The vulnerability exists due to improper handling of a Simple Network Management Protocol (SNMP) request for specific Object Identifiers (OIDs) by the Intermediate System–to–Intermediate System (IS–IS) process. A remote authenticated attacker can send a specially crafted SNMP request and cause a denial of service condition in the IS–IS process.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco IOS XR: 4.3.2, 5.2.5, 6.1.3 - 6.1.4, 6.2.3 - 6.2.25, 6.3.2 - 6.3.15, 6.4.2, 6.5.2 - 6.5.3, 6.6.1 - 6.6.25

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External links
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200122-ios-xr-dos

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.