CVE-2025-21117

Local user impersonation via AUI access-token reuse

Published Feb 5, 2025 · Updated Feb 12, 2025

Access-token reuse in the Dell Avamar AUI 19.4 through 19.10 SP1 allows local users to impersonate another user. The AUI accepts an access token after its associated resource has expired or been released, allowing the token to retain another user's identity. Exploitation requires low-privileged local access and user interaction; successful reuse grants the other user's AUI permissions without interrupting service.

CVSS severity6.6
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Access-token reuse in the Dell Avamar AUI 19.4 through 19.10 SP1 allows local users to impersonate another user. The AUI accepts an access token after its associated resource has expired or been released, allowing the token to retain another user's identity. Exploitation requires low-privileged local access and user interaction; successful reuse grants the other user's AUI permissions without interrupting service.

The record

CVE
CVE-2025-21117
Published
Feb 5, 2025
Updated
Feb 12, 2025
Vendor
Dell
Product
Avamar
Classifications
CWE-672, T1550.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 5, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 12, 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=19.10
  2. Affected versionversion=19.10 SP1
  3. Affected versionversion=19.4
  4. Affected versionversion=19.7
  5. Affected versionversion=19.8
  6. Affected versionversion=19.9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Dell · Avamarversion=19.10; version=19.10 SP1; version=19.4; version=19.7; version=19.8; version=19.9

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
6.6DellCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-672Operation on a Resource after Expiration or Release
T1550.001Use Alternate Authentication Material: Application Access Token

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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