CVE-2021-26936Public exploit

Local root escalation via privileged output-file creation

Published Feb 10, 2021 · Updated Aug 3, 2024

Privilege escalation in ReplaySorcery 0.4.0 through 0.5.0 allows local users to gain root via crafted video output paths. The setuid-root replay-sorcery process accepts outputFile from a user-controlled configuration and creates the requested file with full root privileges and an unsafe inherited umask. An unprivileged local account can target a privileged loader-configuration directory, obtain a root-owned but world-writable file, and use it for root escalation when the default setuid-root installation is present.

CVSS severity7.8
High
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Privilege escalation in ReplaySorcery 0.4.0 through 0.5.0 allows local users to gain root via crafted video output paths. The setuid-root replay-sorcery process accepts outputFile from a user-controlled configuration and creates the requested file with full root privileges and an unsafe inherited umask. An unprivileged local account can target a privileged loader-configuration directory, obtain a root-owned but world-writable file, and use it for root escalation when the default setuid-root installation is present.

The record

CVE
CVE-2021-26936
Published
Feb 10, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-269, T1548.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 10, 2021CVE 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

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.2NIST NVDAV:L/AC:L/Au:N/C:C/I:C/A:C

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-269Improper Privilege Management
T1548.001Abuse Elevation Control Mechanism: Setuid and Setgid

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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