How severe is CVE-2017-7478?

CVE-2017-7478 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 none, integrity none, and availability high.

Is CVE-2017-7478 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 14% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-7478?

CVE-2017-7478 primarily affects Openvpn. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-7478?

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-2017-7478 published?

CVE-2017-7478 was published on 2017-05-15 and last updated on 2026-06-17.

CVE-2017-7478

CVE-2017-7478 is a high-severity vulnerability in Openvpn with a CVSS 3.x base score of 7.5. Its EPSS exploit-prediction score of 14% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-20.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 14% (96th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Openvpn
Published: 2017-05-15
Last modified: 2026-06-17

Description

OpenVPN version 2.3.12 and newer is vulnerable to unauthenticated Denial of Service of server via received large control packet. Note that this issue is fixed in 2.3.15 and 2.4.2.

Frequently asked questions

What is CVE-2017-7478?: OpenVPN version 2.3.12 and newer is vulnerable to unauthenticated Denial of Service of server via received large control packet. Note that this issue is fixed in 2.3.15 and 2.4.2.
How severe is CVE-2017-7478?: CVE-2017-7478 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 none, integrity none, and availability high.
Is CVE-2017-7478 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 14% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-7478?: CVE-2017-7478 primarily affects Openvpn. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-7478?: 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-2017-7478 published?: CVE-2017-7478 was published on 2017-05-15 and last updated on 2026-06-17.

References

Affected products (10)

cpe:2.3:a:openvpn:openvpn:2.3.12:*:*:*:*:*:*:*
cpe:2.3:a:openvpn:openvpn:2.3.13:*:*:*:*:*:*:*
cpe:2.3:a:openvpn:openvpn:2.3.14:*:*:*:*:*:*:*
cpe:2.3:a:openvpn:openvpn:2.4.0:*:*:*:*:*:*:*
cpe:2.3:a:openvpn:openvpn:2.4.0:alpha2:*:*:*:*:*:*
cpe:2.3:a:openvpn:openvpn:2.4.0:beta1:*:*:*:*:*:*
cpe:2.3:a:openvpn:openvpn:2.4.0:beta2:*:*:*:*:*:*
cpe:2.3:a:openvpn:openvpn:2.4.0:rc1:*:*:*:*:*:*
cpe:2.3:a:openvpn:openvpn:2.4.0:rc2:*:*:*:*:*:*
cpe:2.3:a:openvpn:openvpn:2.4.1:*:*:*:*:*:*:*

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