CVE-2023-39699: IceWarp Mail Server v10.4.5 was discovered to contain a local file inclusion (LFI) vulnerability via the compo

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2023-39699 is a critical-severity flaw (CVSS 9.8) affecting mail server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

IceWarp Mail Server v10.4.5 was discovered to contain a local file inclusion (LFI) vulnerability via the component /calendar/minimizer/index.php. This vulnerability allows attackers to include or execute files from the local file system of the targeted server.

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-22
Published	2023-08-25
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: icewarp

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

Am I affected?

Timeline

2023-08-25 00:15 UTCPublished CVE record published
2026-06-17 06:12 UTCUpdated Record last modified

icewarp mail server DOWNGRADE

Affected: 10.4.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 10.4.5

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 10.4.5 (Debian / Ubuntu)

apt-cache madison mail-server sudo apt install mail-server=<VERSION_BEFORE_10.4.5> sudo apt-mark hold mail-server

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

dnf --showduplicates list mail-server sudo dnf downgrade mail-server-<VERSION_BEFORE_10.4.5> sudo dnf versionlock add mail-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.

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-2023-39699?

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

Is CVE-2023-39699 being exploited?

CVE-2023-39699 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-2023-39699 affect?

CVE-2023-39699 affects mail server. Severity is critical (CVSS 9.8). IceWarp Mail Server v10.4.5 was discovered to contain a local file inclusion (LFI) vulnerability via the component /calendar/minimizer/index.php. This vulnerability allows attackers to include or execute files from the local file system of

How urgent is CVE-2023-39699?

Priority 62/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

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References

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