CVE-2015-4236 — Cisco AsyncOS on Email Security Appliance (ESA) devices with software 8.5.6-073, 8.5.6-074, and 9.0.0-461, when clustering is enabled, allows remote attackers to cause a denial of service (clustering and SSH outage) via a packet flood, aka Bug IDs CSCur13704 and CSCuq05636

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MEDIUM

Cisco AsyncOS on Email Security Appliance (ESA) devices with software 8.5.6-073, 8.5.6-074, and 9.0.0-461, when clustering is enabled, allows remote attackers to cause a denial of service (clustering and SSH outage) via a packet flood, aka Bug IDs CSCur13704 and CSCuq05636

Published Jul 10, 2015

4.3

MEDIUM

CVSS 2.0

EPSS 2.39%

Description

Cisco AsyncOS on Email Security Appliance (ESA) devices with software 8.5.6-073, 8.5.6-074, and 9.0.0-461, when clustering is enabled, allows remote attackers to cause a denial of service (clustering and SSH outage) via a packet flood, aka Bug IDs CSCur13704 and CSCuq05636.

Affected products

Remediation

No remediation recorded yet.

Metrics

2.39% 0.02394

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

EPSS probability 0.02394

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	2.39% (0.02394)	83.38th	v5 (v2026.06.15)
Jun 15, 2026	2.39% (0.02394)	81.76th	v5 (v2026.06.15)
Mar 17, 2025	1.17% (0.01166)	77.16th	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=39785
vendor-advisoryx_refsource_CISCOVendor Advisory
http://www.securityfocus.com/bid/75703
vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1032855
vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry

Link	Providers	Tags
http://tools.cisco.com/security/center/viewAlert.x?alertId=39785		vendor-advisoryx_refsource_CISCOVendor Advisory
http://www.securityfocus.com/bid/75703		vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1032855		vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner cisco

Published Jul 10, 2015

Updated Aug 6, 2024

Reserved Jun 4, 2015

Link CVE-2015-4236

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 17, 2026

Link CVE-2015-4236

Red Hat

Severity n/a

Public date n/a

Links CVE-2015-4236