How severe is CVE-2015-4236?

CVE-2015-4236 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2015-4236 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-4236?

CVE-2015-4236 primarily affects Cisco Email Security Appliance. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2015-4236?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2015-4236 published?

CVE-2015-4236 was published on 2015-07-10 and last updated on 2026-06-17.

CVE-2015-4236

CVE-2015-4236 is a medium-severity vulnerability in Cisco Email Security Appliance with a CVSS 2.0 base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-399.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Cisco Email Security Appliance
Published: 2015-07-10
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2015-4236?: CVE-2015-4236 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2015-4236 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-4236?: CVE-2015-4236 primarily affects Cisco Email Security Appliance. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2015-4236?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2015-4236 published?: CVE-2015-4236 was published on 2015-07-10 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:h:cisco:email_security_appliance:8.5.6-074:*:*:*:*:*:*:*
cpe:2.3:o:cisco:email_security_appliance_firmware:8.5.6-073:*:*:*:*:*:*:*
cpe:2.3:o:cisco:email_security_appliance_firmware:9.0.0-461:*:*:*:*:*:*:*

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