CVE-2022-20145Network attack vector

VPN credential theft via protocol downgrade

Published Jun 15, 2022 · Updated Aug 3, 2024

Protocol downgrade in Android 11's VPN service allows remote attackers controlling a malicious Wi-Fi access point to retrieve VPN credentials. startLegacyVpnPrivileged in Vpn.java allows legacy VPN negotiation to downgrade its protocol and disclose stored credentials. Exploitation requires a malicious Wi-Fi access point but no user interaction or prior execution privileges; the exposed credentials enable remote privilege escalation.

CVSS severity9.8
Critical
EPSS probability7.04%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Protocol downgrade in Android 11's VPN service allows remote attackers controlling a malicious Wi-Fi access point to retrieve VPN credentials. startLegacyVpnPrivileged in Vpn.java allows legacy VPN negotiation to downgrade its protocol and disclose stored credentials. Exploitation requires a malicious Wi-Fi access point but no user interaction or prior execution privileges; the exposed credentials enable remote privilege escalation.

The record

CVE
CVE-2022-20145
Published
Jun 15, 2022
Updated
Aug 3, 2024
Vendor
Google Cloud
Product
Android
Classifications
T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 15, 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?

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  1. Affected versionversion=Android-11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google Cloud · Androidversion=Android-11

Published CVSS scores

10.0NIST NVDAV:N/AC:L/Au:N/C:C/I:C/A:C
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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