CVE-2019-3994: ELOG 3.1.4-57bea22 and below is affected by a denial of service vulnerability due to a use after free

Q: How do I fix CVE-2019-3994?

elog: upgrade to newer than 3.1.4-57bea22; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2019-3994 being exploited?

CVE-2019-3994 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-2019-3994 affect?

CVE-2019-3994 affects elog, fedora. Severity is high (CVSS 7.5). ELOG 3.1.4-57bea22 and below is affected by a denial of service vulnerability due to a use after free. A remote unauthenticated attacker can crash the ELOG server by sending multiple HTTP POST requests which causes the ELOG function retriev

Q: How urgent is CVE-2019-3994?

Priority 58/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADEMITIGATE

CVE-2019-3994 is a high-severity flaw (CVSS 7.5) affecting elog, fedora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ELOG 3.1.4-57bea22 and below is affected by a denial of service vulnerability due to a use after free. A remote unauthenticated attacker can crash the ELOG server by sending multiple HTTP POST requests which causes the ELOG function retrieve_url() to use a freed variable.

Why this priority

High severity
Public exploit reference
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	3.3% (top 12%)
CISA exploited list	No
Weakness	CWE-416
Published	2019-12-17
Last modified	2026-06-17

Publisher (CNA): Tenable Network Security, Inc. · Vendor: elog project · fedoraproject

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

Am I affected?

Timeline

2019-12-17 22:15 UTCPublished CVE record published
2026-06-17 02:36 UTCUpdated Record last modified

elog project elog UPGRADE

Affected: <= 3.1.4-57bea22

Fixed in: newer than 3.1.4-57bea22

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 3.1.4-57bea22 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade elog

Note

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

fedoraproject fedora MITIGATE

Affected: 30 · 31

Fixed in: no fixed release known

Safe to downgrade to: a release before 30

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2019-3994?

elog: upgrade to newer than 3.1.4-57bea22; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-3994 being exploited?

CVE-2019-3994 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-2019-3994 affect?

CVE-2019-3994 affects elog, fedora. Severity is high (CVSS 7.5). ELOG 3.1.4-57bea22 and below is affected by a denial of service vulnerability due to a use after free. A remote unauthenticated attacker can crash the ELOG server by sending multiple HTTP POST requests which causes the ELOG function retriev

How urgent is CVE-2019-3994?

Priority 58/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

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References

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