CVE-2015-0609 — Race condition in the Common Classification Engine (CCE) in the Measurement, Aggregation, and Correlation Engine (MACE) implementation in Cisco IOS 15.4(2)T3 and earlier allows remote attackers to cause a denial of service (device reload) via crafted network traffic that triggers improper handling of the timing of process switching and Cisco Express Forwarding (CEF) switching, aka Bug ID CSCuj96752

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HIGH

Race condition in the Common Classification Engine (CCE) in the Measurement, Aggregation, and Correlation Engine (MACE) implementation in Cisco IOS 15.4(2)T3 and earlier allows remote attackers to cause a denial of service (device reload) via crafted network traffic that triggers improper handling of the timing of process switching and Cisco Express Forwarding (CEF) switching, aka Bug ID CSCuj96752

Published Feb 16, 2015

7.1

HIGH

CVSS 2.0

EPSS 1.17%

Description

Race condition in the Common Classification Engine (CCE) in the Measurement, Aggregation, and Correlation Engine (MACE) implementation in Cisco IOS 15.4(2)T3 and earlier allows remote attackers to cause a denial of service (device reload) via crafted network traffic that triggers improper handling of the timing of process switching and Cisco Express Forwarding (CEF) switching, aka Bug ID CSCuj96752.

Remediation

No remediation recorded yet.

Metrics

1.17% 0.01174

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

EPSS probability 0.01174

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	1.17% (0.01174)	66.37th	v5 (v2026.06.15)
Jun 15, 2026	1.17% (0.01174)	63.33th	v5 (v2026.06.15)
Mar 17, 2025	0.62% (0.00616)	68.13th	v4 (v2025.03.14)
Dec 12, 2024	1.35% (0.01355)	86.76th	v3 (v2023.03.01)
May 6, 2024	1.35% (0.01355)	86.09th	v3 (v2023.03.01)
Mar 7, 2023	1.35% (0.01355)	84.09th	v3 (v2023.03.01)
Mar 6, 2023	1.21% (0.01213)	66.61th	v2 (v2022.01.01)
Feb 17, 2023	1.21% (0.01213)	66.22th	v2 (v2022.01.01)
Apr 1, 2022	1.21% (0.01213)	64.21th	v2 (v2022.01.01)
Feb 4, 2022	1.21% (0.01213)	40.54th	v2 (v2022.01.01)

Weaknesses (1)

CWE-362

Race Condition

References (5)

http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2015-0609
vendor-advisoryx_refsource_CISCOVendor Advisory
http://tools.cisco.com/security/center/viewAlert.x?alertId=37420
x_refsource_CONFIRMVendor Advisory
http://www.securityfocus.com/bid/72564
vdb-entryx_refsource_BID
http://www.securitytracker.com/id/1031731
vdb-entryx_refsource_SECTRACK
https://exchange.xforce.ibmcloud.com/vulnerabilities/100809
vdb-entryx_refsource_XF

Link	Providers	Tags
http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2015-0609		vendor-advisoryx_refsource_CISCOVendor Advisory
http://tools.cisco.com/security/center/viewAlert.x?alertId=37420		x_refsource_CONFIRMVendor Advisory
http://www.securityfocus.com/bid/72564		vdb-entryx_refsource_BID
http://www.securitytracker.com/id/1031731		vdb-entryx_refsource_SECTRACK
https://exchange.xforce.ibmcloud.com/vulnerabilities/100809		vdb-entryx_refsource_XF

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner cisco

Published Feb 16, 2015

Updated Aug 6, 2024

Reserved Jan 7, 2015

Link CVE-2015-0609

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 17, 2026

Link CVE-2015-0609

Red Hat

Severity n/a

Public date n/a

Links CVE-2015-0609