Unrated severityNVD Advisory· Published Jun 27, 2015· Updated Jun 17, 2026

CVE-2015-4199

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Cisco Systems, Inc./Cisco iOS
cpe:2.3:o:cisco:ios:15.3s:*:*:*:*:*:*:*
Cisco Systems, Inc./IOS 15.3Sllm-create

Patches

Vulnerability mechanics

References

tools.cisco.com/security/center/viewAlert.xnvdVendor Advisory
www.securityfocus.com/bid/75335nvdThird Party AdvisoryVDB Entry
www.securitytracker.com/id/1032692nvdThird Party AdvisoryVDB Entry

News mentions

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