CVE-2025-21120: Dell Avamar, versions prior to 19.10 SP1 with patch 338904, contains a Trusting HTTP Permission Methods on the

Routine

HIGH 8.3DOWNGRADEDOWNGRADEDOWNGRADE

CVE-2025-21120 is a high-severity flaw (CVSS 8.3) affecting avamar, avamar, avamar. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Dell Avamar, versions prior to 19.10 SP1 with patch 338904, contains a Trusting HTTP Permission Methods on the Server-Side vulnerability in Security. A low privileged attacker with remote access could potentially exploit this vulnerability, leading to Information exposure.

Why this priority

High severity

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

Risk facts

CVSS score	8.3 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 75%)
CISA exploited list	No
Weakness	CWE-650
Published	2025-08-04
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

2025-08-04 19:15 UTCPublished CVE record published
2026-06-17 08:42 UTCUpdated Record last modified

dell avamar DOWNGRADE

Affected: 19.4 · 19.7 · 19.8 · 19.9 · 19.10 · 19.10 sp1 · 19.12

Fixed in: no fixed release known

Safe to downgrade to: a release before 19.4

1. Check installed version

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

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

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

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

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

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.

dell avamar DOWNGRADE

Affected: 19.4 · 19.7 · 19.8 · 19.9 · 19.10 · 19.10 sp1 · 19.12

Fixed in: no fixed release known

Safe to downgrade to: a release before 19.4

1. Check installed version

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

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

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

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

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

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.

dell avamar DOWNGRADE

Affected: 19.4 · 19.7 · 19.8 · 19.9 · 19.10 · 19.10 sp1 · 19.12

Fixed in: no fixed release known

Safe to downgrade to: a release before 19.4

1. Check installed version

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

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

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

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

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

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-2025-21120?

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

Is CVE-2025-21120 being exploited?

CVE-2025-21120 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-2025-21120 affect?

CVE-2025-21120 affects avamar, avamar, avamar. Severity is high (CVSS 8.3). Dell Avamar, versions prior to 19.10 SP1 with patch 338904, contains a Trusting HTTP Permission Methods on the Server-Side vulnerability in Security. A low privileged attacker with remote access could potentially exploit this vulnerability,

How urgent is CVE-2025-21120?

Priority 35/100. High severity

Software pages

Dell vulnerabilities

References

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