TI-2015-03518 Aliases CVE-2015-4199 GHSA-3422-45qx-4m3x

Race condition in the IPv6-to-IPv4 functionality in Cisco IOS 15.3S in the Performance…

LOW 35CWE-362Published 2015-06-27 · Updated 2024-08-06

Key facts

Attack vector: Network
Privileges required: None
User interaction: — Not recorded in CVSS 2.0
Attack complexity: Medium
Impact type: —
Confidentiality · integrity · availability: None · None · Complete
Fix status: No fix listed

Attack profile from CVSS 2.0 · NVD. Fix status from CNA.

Summary

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.

Why it matters now

EPSS 0.02109 81st percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:o:cisco:ios:15.3s:::::::*	15.3s	Vulnerable	Cisco

cpe:2.3:o:cisco:ios:15.3s:*:*:*:*:*:*:* Versions 15.3s Vulnerable ·Cisco

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2015-4199
2026-10-03 Alias added: GHSA-3422-45qx-4m3x

References

Advisory 1

20150622 Cisco IOS Software UBR Devices IPv6 to IPv4 Subsystem Denial of Service Vulnerability

TI-2018-00138 Improper input validation in Cisco IOS and IOS XE KEVCVSS 3.1CRITICAL 9.8
TI-2017-09019 Improper input validation in Cisco IOS and IOS XE KEVCVSS 3.1CRITICAL 9.8
TI-2017-02977 Improper input validation in Cisco IOS and IOS XE Software KEVCVSS 3.1CRITICAL 9.8
TI-2018-00135 Memory corruption in Cisco IOS, IOS XE, and IOS XR KEVCVSS 3.1HIGH 8.8
TI-2017-04499 Memory corruption in Cisco IOS KEVCVSS 3.1HIGH 8.8
TI-2017-04498 Memory corruption in Cisco IOS KEVCVSS 3.1HIGH 8.8

See all 617 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences