CVE-2024-48938: Znuny before LTS 6.5.1 through 6.5.10 and 7.0.1 through 7.0.16 allows DoS/ReDos via email

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HIGH 7.5REMOTEUPGRADE

CVE-2024-48938 is a high-severity flaw (CVSS 7.5) affecting znuny. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Znuny before LTS 6.5.1 through 6.5.10 and 7.0.1 through 7.0.16 allows DoS/ReDos via email. Parsing the content of emails where HTML code is copied from Microsoft Word could lead to high CPU usage and block the parsing process.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-1333
Published	2024-10-11
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: znuny

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

Am I affected?

Timeline

2024-10-11 21:15 UTCPublished CVE record published
2026-06-17 07:59 UTCUpdated Record last modified

znuny znuny UPGRADE

Affected: >= 6.0.0 and < 6.1.0 · >= 6.5.1 and <= 6.5.10 · >= 7.0.1 and <= 7.0.16

Fixed in: 6.1.0

Safe to downgrade to: a release before 6.0.0

1. Check installed version

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

2. UPGRADE to 6.1.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade znuny

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 6.0.0 (Debian / Ubuntu)

apt-cache madison znuny sudo apt install znuny=<VERSION_BEFORE_6.0.0> sudo apt-mark hold znuny

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

dnf --showduplicates list znuny sudo dnf downgrade znuny-<VERSION_BEFORE_6.0.0> sudo dnf versionlock add znuny

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-2024-48938?

znuny: upgrade to 6.1.0. Exact commands for each OS are on this page.

Is CVE-2024-48938 being exploited?

CVE-2024-48938 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-2024-48938 affect?

CVE-2024-48938 affects znuny. Severity is high (CVSS 7.5). Znuny before LTS 6.5.1 through 6.5.10 and 7.0.1 through 7.0.16 allows DoS/ReDos via email. Parsing the content of emails where HTML code is copied from Microsoft Word could lead to high CPU usage and block the parsing process.

How urgent is CVE-2024-48938?

Priority 43/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-43926 MEDIUM 6.1 UPGRADE An issue was discovered in Znuny through 6.5.14 and 7.x through 7.1.6
CVE-2025-26847 HIGH 7.5 UPGRADE An issue was discovered in Znuny before 7.1.5
CVE-2025-26846 CRITICAL 9.8 UPGRADE An issue was discovered in Znuny before 7.1.4
CVE-2025-26845 CRITICAL 9.8 UPGRADE An Eval Injection issue was discovered in Znuny through 7.1.3
CVE-2025-26844 CRITICAL 9.8 UPGRADE An issue was discovered in Znuny through 7.1.3

References

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