CVE-2015-4200 — Memory leak 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 (memory consumption) by triggering an error during CPE negotiation, aka Bug ID CSCug00885

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HIGH

Memory leak 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 (memory consumption) by triggering an error during CPE negotiation, aka Bug ID CSCug00885

Published Jun 23, 2015

7.8

HIGH

CVSS 2.0

EPSS 3.46%

Description

Memory leak 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 (memory consumption) by triggering an error during CPE negotiation, aka Bug ID CSCug00885.

Affected products

Remediation

No remediation recorded yet.

Metrics

3.46% 0.03456

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.03456

Score over time

2022–2026

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (10 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	3.46% (0.03456)	88.64th	v5 (v2026.06.15)
Jun 15, 2026	3.46% (0.03456)	87.46th	v5 (v2026.06.15)
Mar 17, 2025	1.31% (0.01307)	78.40th	v4 (v2025.03.14)
Dec 12, 2024	0.26% (0.00259)	66.15th	v3 (v2023.03.01)
Feb 8, 2024	0.26% (0.00259)	64.68th	v3 (v2023.03.01)
Mar 7, 2023	0.26% (0.00259)	61.87th	v3 (v2023.03.01)
Mar 6, 2023	1.14% (0.01136)	59.45th	v2 (v2022.01.01)
Oct 18, 2022	1.14% (0.01136)	58.28th	v2 (v2022.01.01)
Apr 1, 2022	1.14% (0.01136)	56.27th	v2 (v2022.01.01)
Feb 4, 2022	1.14% (0.01136)	34.23th	v2 (v2022.01.01)

Weaknesses (1)

CWE-399

References (3)

http://tools.cisco.com/security/center/viewAlert.x?alertId=39424
vendor-advisoryx_refsource_CISCOVendor Advisory
http://www.securityfocus.com/bid/75254
vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1032692
vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry

Link	Providers	Tags
http://tools.cisco.com/security/center/viewAlert.x?alertId=39424		vendor-advisoryx_refsource_CISCOVendor Advisory
http://www.securityfocus.com/bid/75254		vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1032692		vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner cisco

Published Jun 23, 2015

Updated Aug 6, 2024

Reserved Jun 4, 2015

Link CVE-2015-4200

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 17, 2026

Link CVE-2015-4200

Red Hat

Severity n/a

Public date n/a

Links CVE-2015-4200