How severe is CVE-2016-5306?

CVE-2016-5306 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2016-5306 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-5306?

CVE-2016-5306 affects Symantec Endpoint Protection Manager. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2016-5306?

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

When was CVE-2016-5306 published?

CVE-2016-5306 was published on 2016-06-30 and last updated on 2026-06-17.

CVE-2016-5306

CVE-2016-5306 is a medium-severity vulnerability in Symantec Endpoint Protection Manager with a CVSS 3.x base score of 5.3. 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-200.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Symantec Endpoint Protection Manager
Published: 2016-06-30
Last modified: 2026-06-17

Description

Symantec Endpoint Protection Manager (SEPM) 12.1 before RU6 MP5 does not properly implement the HSTS protection mechanism, which makes it easier for remote attackers to obtain sensitive information by sniffing the network for unintended HTTP traffic on port 8445.

Frequently asked questions

What is CVE-2016-5306?: Symantec Endpoint Protection Manager (SEPM) 12.1 before RU6 MP5 does not properly implement the HSTS protection mechanism, which makes it easier for remote attackers to obtain sensitive information by sniffing the network for unintended HTTP traffic on port 8445.
How severe is CVE-2016-5306?: CVE-2016-5306 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2016-5306 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-5306?: CVE-2016-5306 affects Symantec Endpoint Protection Manager. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2016-5306?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2016-5306 published?: CVE-2016-5306 was published on 2016-06-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:symantec:endpoint_protection_manager:*:mp4:*:*:*:*:*:*

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