How severe is CVE-2025-12106?

CVE-2025-12106 has a CVSS 3.x base score of 9.1, rated critical 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 high.

Is CVE-2025-12106 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-12106?

CVE-2025-12106 primarily affects Openvpn. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-12106?

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

Does CVE-2025-12106 have an EU (EUVD) identifier?

Yes. CVE-2025-12106 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-199988.

When was CVE-2025-12106 published?

CVE-2025-12106 was published on 2025-12-01 and last updated on 2026-06-17.

CVE-2025-12106

CVE-2025-12106 is a critical-severity vulnerability in Openvpn with a CVSS 3.x base score of 9.1. 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-126.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
EPSS exploit prediction: 1% (41st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-199988
Weakness: CWE-126
Affected product: Openvpn
Published: 2025-12-01
Last modified: 2026-06-17

Description

Insufficient argument validation in OpenVPN 2.7_alpha1 through 2.7_rc1 allows an attacker to trigger a heap buffer over-read when parsing IP addresses

Frequently asked questions

What is CVE-2025-12106?: Insufficient argument validation in OpenVPN 2.7_alpha1 through 2.7_rc1 allows an attacker to trigger a heap buffer over-read when parsing IP addresses
How severe is CVE-2025-12106?: CVE-2025-12106 has a CVSS 3.x base score of 9.1, rated critical 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 high.
Is CVE-2025-12106 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-12106?: CVE-2025-12106 primarily affects Openvpn. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-12106?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-12106 have an EU (EUVD) identifier?: Yes. CVE-2025-12106 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-199988.
When was CVE-2025-12106 published?: CVE-2025-12106 was published on 2025-12-01 and last updated on 2026-06-17.

References

Affected products (8)

cpe:2.3:a:openvpn:openvpn:2.6.13:*:*:*:community:*:*:*
cpe:2.3:a:openvpn:openvpn:2.7:alpha1:*:*:community:*:*:*
cpe:2.3:a:openvpn:openvpn:2.7:alpha2:*:*:community:*:*:*
cpe:2.3:a:openvpn:openvpn:2.7:alpha3:*:*:community:*:*:*
cpe:2.3:a:openvpn:openvpn:2.7:beta1:*:*:community:*:*:*
cpe:2.3:a:openvpn:openvpn:2.7:beta2:*:*:community:*:*:*
cpe:2.3:a:openvpn:openvpn:2.7:beta3:*:*:community:*:*:*
cpe:2.3:a:openvpn:openvpn:2.7:rc1:*:*:community:*:*:*

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