How severe is CVE-2016-1777?

CVE-2016-1777 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2016-1777 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-1777?

CVE-2016-1777 affects Apple Mac Os X Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2016-1777?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2016-1777 published?

CVE-2016-1777 was published on 2016-03-24 and last updated on 2026-06-17.

CVE-2016-1777

CVE-2016-1777 is a high-severity vulnerability in Apple Mac Os X Server with a CVSS 3.x base score of 7.5. 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-310.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (78th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-310
Affected product: Apple Mac Os X Server
Published: 2016-03-24
Last modified: 2026-06-17

Description

Web Server in Apple OS X Server before 5.1 supports the RC4 algorithm, which makes it easier for remote attackers to defeat cryptographic protection mechanisms via unspecified vectors.

Frequently asked questions

What is CVE-2016-1777?: Web Server in Apple OS X Server before 5.1 supports the RC4 algorithm, which makes it easier for remote attackers to defeat cryptographic protection mechanisms via unspecified vectors.
How severe is CVE-2016-1777?: CVE-2016-1777 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2016-1777 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-1777?: CVE-2016-1777 affects Apple Mac Os X Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2016-1777?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2016-1777 published?: CVE-2016-1777 was published on 2016-03-24 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:apple:mac_os_x_server:*:*:*:*:*:*:*:*

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