CVE-2022-25166Public exploit

Net-NTLMv2 hash disclosure via unchecked UNC paths

Published Apr 14, 2022 · Updated Aug 3, 2024

Information disclosure in Amazon AWS VPN Client 2.0.0 and earlier allows local users to leak Net-NTLMv2 hashes via crafted profiles. The CheckFilePath method in OvpnConfigParser.cs passes an untrusted UNC filename directly to File.Open during profile validation, causing Windows to authenticate to the remote share. A local user must persuade another user to import the malicious profile; the outbound authentication exposes the victim's reusable challenge-response material.

CVSS severity5.0
Medium
EPSS probability1.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Amazon AWS VPN Client 2.0.0 and earlier allows local users to leak Net-NTLMv2 hashes via crafted profiles. The CheckFilePath method in OvpnConfigParser.cs passes an untrusted UNC filename directly to File.Open during profile validation, causing Windows to authenticate to the remote share. A local user must persuade another user to import the malicious profile; the outbound authentication exposes the victim's reusable challenge-response material.

The record

CVE
CVE-2022-25166
Published
Apr 14, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-200, T1187
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 14, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:P/I:N/A:N
5.0NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1187Forced Authentication

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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