CVE-2017-6627

critical-risk

Published 2017-09-07

A vulnerability in the UDP processing code of Cisco IOS 15.1, 15.2, and 15.4 and IOS XE 3.14 through 3.18 could allow an unauthenticated, remote attacker to cause the input queue of an affected system to hold UDP packets, causing an interface queue wedge and a denial of service (DoS) condition. The vulnerability is due to Cisco IOS Software application changes that create UDP sockets and leave the sockets idle without closing them. An attacker could exploit this vulnerability by sending UDP packets with a destination port of 0 to an affected device. A successful exploit could allow the attacker to cause UDP packets to be held in the input interfaces queue, resulting in a DoS condition. The input interface queue will stop holding UDP packets when it receives 250 packets. Cisco Bug IDs: CSCup10024, CSCva55744, CSCva95506.

Do I need to act?

10.8% chance of exploitation in next 30 days

EPSS score — higher than 89% of all CVEs

CISA KEV: actively exploited in the wild

On the Known Exploited Vulnerabilities catalog — federal agencies must patch

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 7.5/10 High

NETWORK / LOW complexity

Affected Products (20)

Ios

Ios Xe

Affected Vendors

Cisco

References (7)

Third Party Advisory http://www.securityfocus.com/bid/100644

Third Party Advisory http://www.securitytracker.com/id/1039289

Mitigation https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-2...

Third Party Advisory http://www.securityfocus.com/bid/100644

Third Party Advisory http://www.securitytracker.com/id/1039289

Mitigation https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-2...

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-...

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critical-risk

Severity 26/34 · High

Exploitability 18/34 · Moderate

Exposure 28/34 · Critical