CVE-2021-25657

Local privilege escalation via MSI repair temp files

Published Sep 2, 2022 · Updated Sep 17, 2024

Privilege escalation in Avaya IP Office Admin Lite and USB Creator before 11.1 Feature Pack 2 Service Pack 2 allows local users to gain SYSTEM privileges. Windows Installer repair operations run temporary-file actions from SYSTEM context, allowing an authenticated local user with low privileges to execute files as SYSTEM. Exploitation requires local access and no user interaction; the resulting compromise affects confidentiality, integrity, and availability of the host.

CVSS severity7.8
High
EPSS probability0.26%
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 Avaya IP Office Admin Lite and USB Creator before 11.1 Feature Pack 2 Service Pack 2 allows local users to gain SYSTEM privileges. Windows Installer repair operations run temporary-file actions from SYSTEM context, allowing an authenticated local user with low privileges to execute files as SYSTEM. Exploitation requires local access and no user interaction; the resulting compromise affects confidentiality, integrity, and availability of the host.

The record

CVE
CVE-2021-25657
Published
Sep 2, 2022
Updated
Sep 17, 2024
Vendor
Avaya
Product
Avaya IP Office
Classifications
CWE-269, CWE-379, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 2, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=0 <=11.1 Feature Pack 2 Service Pack 1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Avaya · Avaya IP Officeversion=0 <=11.1 Feature Pack 2 Service Pack 1

Published CVSS scores

7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-269Improper Privilege Management
CWE-379Creation of Temporary File in Directory with Insecure Permissions
T1068Exploitation for Privilege Escalation

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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