CVE•Published 2026-07-30•Modified 2026-08-05•0 articles on news•5 live references•NVD data

CVE-2026-11771Openvpn · Openvpn

Vulnerability data via NVD (ingested)

CVSS v3.1

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS percentile

Exploit Prediction Scoring System · top 73% of all CVEs

Weaknesses (CWE)

CWE-121Stack-based Buffer Overflow CWE-193Off-by-one Error CWE-787Out-of-bounds Write

Description

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

Timeline

Published 2026-07-30

Modified 2026-08-05

External references

NVD MITRE Exploit-DB Sploitus VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-11771

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Openvpn Openvpn"

All exposed Openvpn Openvpn instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Openvpn"

HTTP body or banner mentions "Openvpn" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-11771