How severe is CVE-2017-7522?

CVE-2017-7522 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 none, integrity none, and availability high.

Is CVE-2017-7522 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-7522?

CVE-2017-7522 primarily affects Openvpn. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-7522?

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

When was CVE-2017-7522 published?

CVE-2017-7522 was published on 2017-06-27 and last updated on 2026-06-17.

CVE-2017-7522

CVE-2017-7522 is a medium-severity vulnerability in Openvpn 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-476.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 6% (92nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-476
Affected product: Openvpn
Published: 2017-06-27
Last modified: 2026-06-17

Description

OpenVPN versions before 2.4.3 and before 2.3.17 are vulnerable to denial-of-service by authenticated remote attacker via sending a certificate with an embedded NULL character.

Frequently asked questions

What is CVE-2017-7522?: OpenVPN versions before 2.4.3 and before 2.3.17 are vulnerable to denial-of-service by authenticated remote attacker via sending a certificate with an embedded NULL character.
How severe is CVE-2017-7522?: CVE-2017-7522 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 none, integrity none, and availability high.
Is CVE-2017-7522 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-7522?: CVE-2017-7522 primarily affects Openvpn. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-7522?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2017-7522 published?: CVE-2017-7522 was published on 2017-06-27 and last updated on 2026-06-17.

References

Affected products (9)

cpe:2.3:a:openvpn:openvpn:*:*:*:*:*:*:*:*
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:*:*:*:*:*:*:*
cpe:2.3:a:openvpn:openvpn:2.4.2:*:*:*:*:*:*:*

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Other CWE-476 (NULL Pointer Dereference) vulnerabilities

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