How severe is CVE-2016-4467?

CVE-2016-4467 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2016-4467 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-4467?

CVE-2016-4467 primarily affects Apache Qpid Proton. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-4467?

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

When was CVE-2016-4467 published?

CVE-2016-4467 was published on 2017-05-02 and last updated on 2026-06-17.

CVE-2016-4467

CVE-2016-4467 is a medium-severity vulnerability in Apache Qpid Proton with a CVSS 3.x base score of 5.9. 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-295.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v2: 4.3
EPSS exploit prediction: 2% (73rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-295
Affected product: Apache Qpid Proton
Published: 2017-05-02
Last modified: 2026-06-17

Description

The C client and C-based client bindings in the Apache Qpid Proton library before 0.13.1 on Windows do not properly verify that the server hostname matches a domain name in the subject's Common Name (CN) or subjectAltName field of the X.509 certificate when using the SChannel-based security layer, which allows man-in-the-middle attackers to spoof servers via an arbitrary valid certificate.

Frequently asked questions

What is CVE-2016-4467?: The C client and C-based client bindings in the Apache Qpid Proton library before 0.13.1 on Windows do not properly verify that the server hostname matches a domain name in the subject's Common Name (CN) or subjectAltName field of the X.509 certificate when using the SChannel-based security layer, which allows man-in-the-middle attackers to spoof servers via an arbitrary valid certificate.
How severe is CVE-2016-4467?: CVE-2016-4467 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2016-4467 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-4467?: CVE-2016-4467 primarily affects Apache Qpid Proton. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-4467?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2016-4467 published?: CVE-2016-4467 was published on 2017-05-02 and last updated on 2026-06-17.

References

Affected products (10)

cpe:2.3:a:apache:qpid_proton:0.8.0:*:*:*:*:*:*:*
cpe:2.3:a:apache:qpid_proton:0.9.0:*:*:*:*:*:*:*
cpe:2.3:a:apache:qpid_proton:0.9.1:*:*:*:*:*:*:*
cpe:2.3:a:apache:qpid_proton:0.10.0:*:*:*:*:*:*:*
cpe:2.3:a:apache:qpid_proton:0.11.0:*:*:*:*:*:*:*
cpe:2.3:a:apache:qpid_proton:0.11.1:*:*:*:*:*:*:*
cpe:2.3:a:apache:qpid_proton:0.12.0:*:*:*:*:*:*:*
cpe:2.3:a:apache:qpid_proton:0.12.1:*:*:*:*:*:*:*
cpe:2.3:a:apache:qpid_proton:0.12.2:*:*:*:*:*:*:*
cpe:2.3:a:apache:qpid_proton:0.13.0:*:*:*:*:*:*:*

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