CVE-2022-25356: Alt-N MDaemon Security Gateway through 8.5.0 allows SecurityGateway.dll?view=login XML Injection.

Q: How do I fix CVE-2022-25356?

securitygateway: upgrade to newer than 8.5.0. Exact commands for each OS are on this page.

Q: Is CVE-2022-25356 being exploited?

CVE-2022-25356 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2022-25356 affect?

CVE-2022-25356 affects securitygateway. Severity is medium (CVSS 5.3). Alt-N MDaemon Security Gateway through 8.5.0 allows SecurityGateway.dll?view=login XML Injection.

Q: How urgent is CVE-2022-25356?

Priority 52/100. EPSS top 7%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

This week

MEDIUM 5.3REMOTEUPGRADE

CVE-2022-25356 is a medium-severity flaw (CVSS 5.3) affecting securitygateway. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Alt-N MDaemon Security Gateway through 8.5.0 allows SecurityGateway.dll?view=login XML Injection.

Why this priority

EPSS top 7%: 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	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	5.7% (top 7%)
CISA exploited list	No
Weakness	CWE-91
Published	2022-04-05
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: altn

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

Am I affected?

Timeline

2022-04-05 02:15 UTCPublished CVE record published
2026-06-17 04:33 UTCUpdated Record last modified

altn securitygateway UPGRADE

Affected: >= 2.1.0 and <= 8.5.0

Fixed in: newer than 8.5.0

Safe to downgrade to: a release before 2.1.0

1. Check installed version

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

2. UPGRADE to newer than 8.5.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade securitygateway

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 2.1.0 (Debian / Ubuntu)

apt-cache madison securitygateway sudo apt install securitygateway=<VERSION_BEFORE_2.1.0> sudo apt-mark hold securitygateway

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

dnf --showduplicates list securitygateway sudo dnf downgrade securitygateway-<VERSION_BEFORE_2.1.0> sudo dnf versionlock add securitygateway

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.

Nuclei scan template: Alt-n/MDaemon Security Gateway <=8.5.0 - XML Injection

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-2022-25356?

securitygateway: upgrade to newer than 8.5.0. Exact commands for each OS are on this page.

Is CVE-2022-25356 being exploited?

CVE-2022-25356 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-2022-25356 affect?

CVE-2022-25356 affects securitygateway. Severity is medium (CVSS 5.3). Alt-N MDaemon Security Gateway through 8.5.0 allows SecurityGateway.dll?view=login XML Injection.

How urgent is CVE-2022-25356?

Priority 52/100. EPSS top 7%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-52269 MEDIUM 4.8 UPGRADE MDaemon SecurityGateway through 9.0.3 allows XSS via a crafted Message Content Filtering rule

References

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