CVE-2015-4199

Severity: high (CVSS 7.1 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2015-06-27 · updated 2026-06-17
Weakness: CWE-362

Description

Race condition in the IPv6-to-IPv4 functionality in Cisco IOS 15.3S in the Performance Routing Engine (PRE) module on UBR devices allows remote attackers to cause a denial of service (NULL pointer free and module crash) by triggering intermittent connectivity with many IPv6 CPE devices, aka Bug ID CSCug47366.

Affected products

Cisco IOS: 15.3s

References

http://tools.cisco.com/security/center/viewAlert.x?alertId=39423
http://www.securityfocus.com/bid/75335
http://www.securitytracker.com/id/1032692
http://tools.cisco.com/security/center/viewAlert.x?alertId=39423
http://www.securityfocus.com/bid/75335
http://www.securitytracker.com/id/1032692

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