CVE-2022-37242: MDaemon Technologies SecurityGateway for Email Servers 8.5.2, is vulnerable to HTTP Response splitting via the

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2022-37242 is a critical-severity flaw (CVSS 9.8) affecting security gateway for email servers. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

MDaemon Technologies SecurityGateway for Email Servers 8.5.2, is vulnerable to HTTP Response splitting via the data parameter.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.4% (top 27%)
CISA exploited list	No
Weakness	CWE-74
Published	2022-08-25
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

2022-08-25 15:15 UTCPublished CVE record published
2026-06-17 04:54 UTCUpdated Record last modified

altn security gateway for email servers DOWNGRADE

Affected: 8.5.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.5.2

1. Check installed version

apt-cache policy security-gateway-for-email-servers || rpm -q security-gateway-for-email-servers || security-gateway-for-email-servers --version

2. No fixed release: DOWNGRADE to a release before 8.5.2 (Debian / Ubuntu)

apt-cache madison security-gateway-for-email-servers sudo apt install security-gateway-for-email-servers=<VERSION_BEFORE_8.5.2> sudo apt-mark hold security-gateway-for-email-servers

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

dnf --showduplicates list security-gateway-for-email-servers sudo dnf downgrade security-gateway-for-email-servers-<VERSION_BEFORE_8.5.2> sudo dnf versionlock add security-gateway-for-email-servers

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-2022-37242?

security gateway for email servers: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-37242 being exploited?

CVE-2022-37242 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-2022-37242 affect?

CVE-2022-37242 affects security gateway for email servers. Severity is critical (CVSS 9.8). MDaemon Technologies SecurityGateway for Email Servers 8.5.2, is vulnerable to HTTP Response splitting via the data parameter.

How urgent is CVE-2022-37242?

Priority 63/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2022-37245 MEDIUM 5.4 DOWNGRADE MDaemon Technologies SecurityGateway for Email Servers 8.5.2 is vulnerable to Cross Site Scripting (XSS) via t
CVE-2022-37244 MEDIUM 5.4 DOWNGRADE MDaemon Technologies SecurityGateway for Email Servers 8.5.2 is vulnerable to IFRAME Injectionvia the currentR
CVE-2022-37243 MEDIUM 5.4 DOWNGRADE MDaemon Technologies SecurityGateway for Email Servers 8.5.2 is vulnerable to Cross Site Scripting (XSS) via t
CVE-2022-37241 MEDIUM 5.4 DOWNGRADE MDaemon Technologies SecurityGateway for Email Servers 8.5.2 is vulnerable to Cross Site Scripting (XSS) via t
CVE-2022-37240 CRITICAL 9.8 DOWNGRADE MDaemon Technologies SecurityGateway for Email Servers 8.5.2 is vulnerable to HTTP Response splitting via the

References

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