CVE-2021-37425: Altova MobileTogether Server before 7.3 SP1 allows XXE attacks, such as an InfoSetChanges/Changes attack again

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CRITICAL 9.1REMOTEUPGRADE

CVE-2021-37425 is a critical-severity flaw (CVSS 9.1) affecting mobiletogether server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Altova MobileTogether Server before 7.3 SP1 allows XXE attacks, such as an InfoSetChanges/Changes attack against /workflowmanagement, or reading mobiletogetherserver.cfg and then reading the certificate and private key.

Why this priority

Critical severity
EPSS top 1%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	66.3% (top 1%)
CISA exploited list	No
Weakness	CWE-611
Published	2021-08-10
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: altova

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

Am I affected?

Timeline

2021-08-10 22:15 UTCPublished CVE record published
2026-06-17 04:00 UTCUpdated Record last modified

altova mobiletogether server UPGRADE

Affected: >= 7.0 and < 7.3 · 7.3

Fixed in: 7.3

Safe to downgrade to: a release before 7.0

1. Check installed version

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

2. UPGRADE to 7.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mobiletogether-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mobiletogether-server

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 7.0 (Debian / Ubuntu)

apt-cache madison mobiletogether-server sudo apt install mobiletogether-server=<VERSION_BEFORE_7.0> sudo apt-mark hold mobiletogether-server

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

dnf --showduplicates list mobiletogether-server sudo dnf downgrade mobiletogether-server-<VERSION_BEFORE_7.0> sudo dnf versionlock add mobiletogether-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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Altova MobileTogether Server 7.3 - XML External Entity Injection (XXE)

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-2021-37425?

mobiletogether server: upgrade to 7.3. Exact commands for each OS are on this page.

Is CVE-2021-37425 being exploited?

CVE-2021-37425 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-2021-37425 affect?

CVE-2021-37425 affects mobiletogether server. Severity is critical (CVSS 9.1). Altova MobileTogether Server before 7.3 SP1 allows XXE attacks, such as an InfoSetChanges/Changes attack against /workflowmanagement, or reading mobiletogetherserver.cfg and then reading the certificate and private key.

How urgent is CVE-2021-37425?

Priority 67/100. Critical severity; EPSS top 1%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2021-38490 HIGH 7.5 UPGRADE Altova MobileTogether Server before 7.3 SP1 allows XML exponential entity expansion, a different vulnerability

References

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