CVE-2025-21117: Dell Avamar, version 19.4 or later, contains an access token reuse vulnerability in the AUI

Routine

MEDIUM 6.6DOWNGRADE

CVE-2025-21117 is a medium-severity flaw (CVSS 6.6) affecting avamar server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Dell Avamar, version 19.4 or later, contains an access token reuse vulnerability in the AUI. A low privileged local attacker could potentially exploit this vulnerability, leading to fully impersonating the user.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.6 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.2% (top 95%)
CISA exploited list	No
Weakness	CWE-672
Published	2025-02-05
Last modified	2026-06-17

Publisher (CNA): Dell · Vendor: dell

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-02-05 14:15 UTCPublished CVE record published
2026-06-17 08:42 UTCUpdated Record last modified

dell avamar server DOWNGRADE

Affected: 19.4 · 19.7 · 19.8 · 19.9 · 19.10 · 19.10 sp1

Fixed in: no fixed release known

Safe to downgrade to: a release before 19.4

1. Check installed version

apt-cache policy avamar-server || rpm -q avamar-server || avamar-server --version

2. No fixed release: DOWNGRADE to a release before 19.4 (Debian / Ubuntu)

apt-cache madison avamar-server sudo apt install avamar-server=<VERSION_BEFORE_19.4> sudo apt-mark hold avamar-server

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list avamar-server sudo dnf downgrade avamar-server-<VERSION_BEFORE_19.4> sudo dnf versionlock add avamar-server

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-21117?

avamar server: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-21117 being exploited?

CVE-2025-21117 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-21117 affect?

CVE-2025-21117 affects avamar server. Severity is medium (CVSS 6.6). Dell Avamar, version 19.4 or later, contains an access token reuse vulnerability in the AUI. A low privileged local attacker could potentially exploit this vulnerability, leading to fully impersonating the user.

How urgent is CVE-2025-21117?

Priority 24/100. No elevated risk signals yet.

Software pages

Dell vulnerabilities

Related CVEs

CVE-2024-52538 HIGH 7.6 DOWNGRADE Dell Avamar, versions prior to 19.12 with patch 338905, excluding 19.10 and 19.10SP1 with patch 338869, contai
CVE-2024-47977 HIGH 7.1 DOWNGRADE Dell Avamar, versions prior to 19.12 with patch 338905, excluding 19.10 and 19.10SP1 with patch 338869, contai
CVE-2024-47484 HIGH 8.2 DOWNGRADE Dell Avamar, versions prior to 19.12 with patch 338905, excluding 19.10 and 19.10SP1 with patch 338869, contai

References

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