CVE-2025-1782: In HylaFAX Enterprise Web Interface and AvantFAX, the language form element is not properly sanitized before

This month

CRITICAL 9.9UPGRADEUPGRADE

CVE-2025-1782 is a critical-severity flaw (CVSS 9.9) affecting avantfax, hylafax. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In HylaFAX Enterprise Web Interface and AvantFAX, the language form element is not properly sanitized before being used and can be misused to include an arbitrary file in the PHP code allowing an attacker to do anything as the web server user. This flaw requires the attacker to be authenticated with a valid user account.

Why this priority

Critical severity

A fixed release or distro patch exists.

Risk facts

CVSS score	9.9 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.6% (top 54%)
CISA exploited list	No
Weakness	CWE-94
Published	2025-04-14
Last modified	2026-08-06

Publisher (CNA): Red Hat, Inc. · Vendor: avantfax · ifax

Last updated 2026-08-06 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-04-14 19:15 UTCPublished CVE record published
2026-08-06 15:26 UTCUpdated Record last modified

avantfax avantfax UPGRADE

Affected: < 3.4.1

Fixed in: 3.4.1

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 3.4.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade avantfax

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade avantfax

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

ifax hylafax UPGRADE

Affected: < 1.2.1 · >= 1.3.0 and < 1.3.2

Fixed in: 1.2.1, 1.3.2

Safe to downgrade to: a release before 1.3.0

1. Check installed version

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

2. UPGRADE to 1.2.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade hylafax

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade hylafax

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 1.3.0 (Debian / Ubuntu)

apt-cache madison hylafax sudo apt install hylafax=<VERSION_BEFORE_1.3.0> sudo apt-mark hold hylafax

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list hylafax sudo dnf downgrade hylafax-<VERSION_BEFORE_1.3.0> sudo dnf versionlock add hylafax

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-2025-1782?

avantfax: upgrade to 3.4.1; hylafax: upgrade to 1.2.1, 1.3.2. Exact commands for each OS are on this page.

Is CVE-2025-1782 being exploited?

CVE-2025-1782 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-2025-1782 affect?

CVE-2025-1782 affects avantfax, hylafax. Severity is critical (CVSS 9.9). In HylaFAX Enterprise Web Interface and AvantFAX, the language form element is not properly sanitized before being used and can be misused to include an arbitrary file in the PHP code allowing an attacker to do anything as the web server

How urgent is CVE-2025-1782?

Priority 46/100. Critical severity

Software pages

PHP vulnerabilities

References

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