CVE-2026-11771
7
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
Summary
OpenVPN version 2.1.0 through 2.6.20 and 2.7_alpha1 through 2.7.4 allows attackers via an off-by-one buffer write in the NTLM proxy authentication to potentially cause a crash via a crafted NTLM response from a malicious proxy server
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| OpenVPN | OpenVPN | 2.1.0 <= 2.6.20 | affected |
| OpenVPN | OpenVPN | 2.7_alpha1 <= 2.7.4 | affected |
Weaknesses
- CWE-193: CWE-193 Off-by-one error
- CWE-121: CWE-121 Stack-based buffer overflow
- CWE-787: CWE-787 Out-of-bounds write
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
- https://community.openvpn.net/Security%20Announcements/CVE-2026-11771
- https://community.openvpn.net/ReleaseHistory#openvpn-275-released-1-july-2026
- https://community.openvpn.net/ReleaseHistory#openvpn-2621-released-1-july-2026
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