How severe is CVE-2015-4278?

CVE-2015-4278 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2015-4278 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-4278?

CVE-2015-4278 primarily affects Cisco Email Security Appliance Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2015-4278?

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

When was CVE-2015-4278 published?

CVE-2015-4278 was published on 2015-07-16 and last updated on 2026-06-17.

CVE-2015-4278

CVE-2015-4278 is a medium-severity vulnerability in Cisco Email Security Appliance Firmware 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-20.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Cisco Email Security Appliance Firmware
Published: 2015-07-16
Last modified: 2026-06-17

Description

Cisco Email Security Appliance (ESA) devices with software 8.5.6-106 and 9.5.0-201 allow remote attackers to cause a denial of service (per-domain e-mail reception outage) by placing malformed DMARC policy data in DNS TXT records for a domain, aka Bug ID CSCuv14806.

Frequently asked questions

What is CVE-2015-4278?: Cisco Email Security Appliance (ESA) devices with software 8.5.6-106 and 9.5.0-201 allow remote attackers to cause a denial of service (per-domain e-mail reception outage) by placing malformed DMARC policy data in DNS TXT records for a domain, aka Bug ID CSCuv14806.
How severe is CVE-2015-4278?: CVE-2015-4278 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2015-4278 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-4278?: CVE-2015-4278 primarily affects Cisco Email Security Appliance Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2015-4278?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2015-4278 published?: CVE-2015-4278 was published on 2015-07-16 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:o:cisco:email_security_appliance_firmware:8.5.6-106:*:*:*:*:*:*:*
cpe:2.3:o:cisco:email_security_appliance_firmware:9.5.0-201:*:*:*:*:*:*:*

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