CVE-2022-25327

Login denial of service via unsafe metadata reads

Published Feb 25, 2022 · Updated Apr 21, 2025

Denial of service in Google fscrypt 0.3.2 and earlier allows local users to prevent other users from logging in via crafted metadata files. The PAM path reads metadata without limiting file size or rejecting FIFOs and symlinks, so oversized input can exhaust memory and special files can hang processing. A local account able to place malicious policy or protector metadata can interrupt subsequent logins, without reported confidentiality or integrity impact.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Google fscrypt 0.3.2 and earlier allows local users to prevent other users from logging in via crafted metadata files. The PAM path reads metadata without limiting file size or rejecting FIFOs and symlinks, so oversized input can exhaust memory and special files can hang processing. A local account able to place malicious policy or protector metadata can interrupt subsequent logins, without reported confidentiality or integrity impact.

The record

CVE
CVE-2022-25327
Published
Feb 25, 2022
Updated
Apr 21, 2025
Vendor
Google
Product
fscrypt
Classifications
CWE-276, CWE-255, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 25, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <=0.3.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Google · fscryptversion=unspecified <=0.3.2

Published CVSS scores

5.5Google Inc.CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
2.1NIST NVDAV:L/AC:L/Au:N/C:N/I:N/A:P

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-276Incorrect Default Permissions
CWE-255Credentials Management Errors
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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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