CVE-2020-25582Network attack vector

Host filesystem access via jail attachment race

Published Mar 26, 2021 · Updated Aug 4, 2024

Race condition in FreeBSD 12.2-RELEASE before p4 and 11.4-RELEASE before p8 allows remote authenticated users with jailed root to access host files. jail_attach(2) changes the process prison before its caller changes the current working directory, creating a race in which jailed root can attach with ptrace(2) and redirect the process root outside the jail. Exploitation requires root privileges inside a jail and winning this transition window; successful attacks gain full read and write access to host files and directories.

CVSS severity8.7
High
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in FreeBSD 12.2-RELEASE before p4 and 11.4-RELEASE before p8 allows remote authenticated users with jailed root to access host files. jail_attach(2) changes the process prison before its caller changes the current working directory, creating a race in which jailed root can attach with ptrace(2) and redirect the process root outside the jail. Exploitation requires root privileges inside a jail and winning this transition window; successful attacks gain full read and write access to host files and directories.

The record

CVE
CVE-2020-25582
Published
Mar 26, 2021
Updated
Aug 4, 2024
Vendor
The FreeBSD Project
Product
FreeBSD
Classifications
CWE-362, T1611
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Mar 26, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

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

  1. Affected versionversion=FreeBSD 12.2-RELEASE before p4, 11.4-RELEASE before p8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

The FreeBSD Project · FreeBSDversion=FreeBSD 12.2-RELEASE before p4, 11.4-RELEASE before p8

Published CVSS scores

8.7NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N
8.5NIST NVDAV:N/AC:L/Au:S/C:C/I:C/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.

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)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1611Escape to Host

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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