CVE-2019-12940: LiveZilla Server before 8.0.1.1 is vulnerable to Denial Of Service (memory consumption) in knowledgebase.php v

Q: How do I fix CVE-2019-12940?

livezilla: upgrade to 8.0.1.1. Exact commands for each OS are on this page.

Q: Is CVE-2019-12940 being exploited?

CVE-2019-12940 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-2019-12940 affect?

CVE-2019-12940 affects livezilla. Severity is medium (CVSS 5.9). LiveZilla Server before 8.0.1.1 is vulnerable to Denial Of Service (memory consumption) in knowledgebase.php via a large integer value of the depth parameter.

Q: How urgent is CVE-2019-12940?

Priority 47/100. Public exploit reference; Remotely exploitable, no login, no user action

This week

MEDIUM 5.9REMOTEUPGRADE

CVE-2019-12940 is a medium-severity flaw (CVSS 5.9) affecting livezilla. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

LiveZilla Server before 8.0.1.1 is vulnerable to Denial Of Service (memory consumption) in knowledgebase.php via a large integer value of the depth parameter.

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-770
Published	2019-06-24
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: livezilla

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

Am I affected?

Timeline

2019-06-24 16:15 UTCPublished CVE record published
2026-06-17 02:15 UTCUpdated Record last modified

livezilla livezilla UPGRADE

Affected: < 8.0.1.1

Fixed in: 8.0.1.1

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 8.0.1.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade livezilla

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2019-12940?

livezilla: upgrade to 8.0.1.1. Exact commands for each OS are on this page.

Is CVE-2019-12940 being exploited?

CVE-2019-12940 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-2019-12940 affect?

CVE-2019-12940 affects livezilla. Severity is medium (CVSS 5.9). LiveZilla Server before 8.0.1.1 is vulnerable to Denial Of Service (memory consumption) in knowledgebase.php via a large integer value of the depth parameter.

How urgent is CVE-2019-12940?

Priority 47/100. Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2020-9758 CRITICAL 9.6 UPGRADE An issue was discovered in chat.php in LiveZilla Live Chat 8.0.1.3 (Helpdesk)
CVE-2019-12964 MEDIUM 6.1 UPGRADE LiveZilla Server before 8.0.1.1 is vulnerable to XSS in the ticket.php Subject.
CVE-2019-12963 MEDIUM 6.1 UPGRADE LiveZilla Server before 8.0.1.1 is vulnerable to XSS in the chat.php Create Ticket Action.
CVE-2019-12962 MEDIUM 6.1 UPGRADE LiveZilla Server before 8.0.1.1 is vulnerable to XSS in mobile/index.php via the Accept-Language HTTP header.
CVE-2019-12961 HIGH 8.8 UPGRADE LiveZilla Server before 8.0.1.1 is vulnerable to CSV Injection in the Export Function.

References

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