CVE-2026-11771

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Source
https://cve.org/CVERecord?id=CVE-2026-11771
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-11771.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-11771
Downstream
Published
2026-07-30T16:36:41.087Z
Modified
2026-08-07T03:45:24.096013234Z
Severity
  • 7.0 (High) CVSS_V4 - 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 CVSS Calculator
Summary
[none]
Details

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

Database specific 
{
    "cna_assigner": "OpenVPN",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/11xxx/CVE-2026-11771.json",
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "introduced": "2.1.0"
                },
                {
                    "last_affected": "2.6.20"
                },
                {
                    "introduced": "2.7_alpha1"
                },
                {
                    "last_affected": "2.7.4"
                }
            ],
            "source": "AFFECTED_FIELD"
        },
        {
            "extracted_events": [
                {
                    "introduced": "2.1.0"
                },
                {
                    "fixed": "2.6.20"
                },
                {
                    "introduced": "2.7_alpha1"
                },
                {
                    "fixed": "2.7.4"
                }
            ],
            "source": "DESCRIPTION"
        }
    ],
    "cwe_ids": [
        "CWE-121",
        "CWE-193",
        "CWE-787"
    ]
}
References

Affected packages

Git / github.com/openvpn/openvpn

Affected ranges

Type
GIT
Repo
https://github.com/openvpn/openvpn
Events
Introduced
4580320b22946a1dd65039a6efcd616ee5e4ac3b
Fixed
4dee614e4e799d6d4a20bffabd902291c86406f2
Introduced
ee1577744fb09af760dc319d57746e6abc55db85
Fixed
b25bb2a8bda814edab39b4246d4e296330a7a29e
Database specific 
{
    "extracted_events": [
        {
            "introduced": "2.1.0"
        },
        {
            "fixed": "2.6.21"
        },
        {
            "introduced": "2.7"
        },
        {
            "fixed": "2.7.5"
        }
    ],
    "cpe": "cpe:2.3:a:openvpn:openvpn:*:*:*:*:*:*:*:*",
    "source": "CPE_RANGE"
}

Affected versions

v2.*
v2.1.0
v2.1.1
v2.1.2
v2.1.3
v2.2-RC
v2.2-RC2
v2.2-beta4
v2.2-beta5
v2.3-alpha1
v2.3_alpha2
v2.3_alpha3
v2.3_beta1
v2.4_alpha1
v2.4_alpha2
v2.4_beta1
v2.4_beta2
v2.4_rc1
v2.4_rc2
v2.6.0
v2.6.1
v2.6.10
v2.6.11
v2.6.12
v2.6.13
v2.6.14
v2.6.15
v2.6.16
v2.6.17
v2.6.18
v2.6.19
v2.6.2
v2.6.20
v2.6.3
v2.6.4
v2.6.5
v2.6.6
v2.6.7
v2.6.8
v2.6.9
v2.6_beta1
v2.6_beta2
v2.6_rc1
v2.6_rc2
v2.7.0
v2.7.1
v2.7.2
v2.7.3
v2.7.4

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-11771.json"