How severe is CVE-2016-4643?

CVE-2016-4643 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2016-4643 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-4643?

CVE-2016-4643 primarily affects Apple Apple Tv. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-4643?

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

When was CVE-2016-4643 published?

CVE-2016-4643 was published on 2019-01-11 and last updated on 2026-06-17.

CVE-2016-4643

CVE-2016-4643 is a medium-severity vulnerability in Apple Apple Tv with a CVSS 3.x base score of 6.5. 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-200.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 1% (65th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Apple Apple Tv
Published: 2019-01-11
Last modified: 2026-06-17

Description

In iOS before 9.3.3, tvOS before 9.2.2, and OS X El Capitan before v10.11.6 and Security Update 2016-004, a validation issue existed in the parsing of 407 responses. This issue was addressed through improved response validation.

Frequently asked questions

What is CVE-2016-4643?: In iOS before 9.3.3, tvOS before 9.2.2, and OS X El Capitan before v10.11.6 and Security Update 2016-004, a validation issue existed in the parsing of 407 responses. This issue was addressed through improved response validation.
How severe is CVE-2016-4643?: CVE-2016-4643 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2016-4643 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-4643?: CVE-2016-4643 primarily affects Apple Apple Tv. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-4643?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2016-4643 published?: CVE-2016-4643 was published on 2019-01-11 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:apple:apple_tv:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os:*:*:*:*:*:*:*:*

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