CVE-2014-3634: rsyslog before 7.6.6 and 8.x before 8.4.1 and sysklogd 1.5 and earlier allows remote attackers to cause a deni

Q: How do I fix CVE-2014-3634?

sysklogd: upgrade to newer than 1.5; rsyslog: upgrade to newer than 7.6.5. Exact commands for each OS are on this page.

Q: Is CVE-2014-3634 being exploited?

CVE-2014-3634 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-2014-3634 affect?

CVE-2014-3634 affects sysklogd, rsyslog. Severity is high (CVSS 7.5). rsyslog before 7.6.6 and 8.x before 8.4.1 and sysklogd 1.5 and earlier allows remote attackers to cause a denial of service (crash), possibly execute arbitrary code, or have other unspecified impact via a crafted priority (PRI) value that t

Q: How urgent is CVE-2014-3634?

Priority 55/100. High severity; EPSS top 5%: very likely to be exploited; Public exploit reference

This month

HIGH 7.5UPGRADEUPGRADE

CVE-2014-3634 is a high-severity flaw (CVSS 7.5) affecting sysklogd, rsyslog. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

rsyslog before 7.6.6 and 8.x before 8.4.1 and sysklogd 1.5 and earlier allows remote attackers to cause a denial of service (crash), possibly execute arbitrary code, or have other unspecified impact via a crafted priority (PRI) value that triggers an out-of-bounds array access.

Why this priority

High severity
EPSS top 5%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	7.5% (top 5%)
CISA exploited list	No
Weakness	CWE-119
Published	2014-11-02
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: rsyslog · sysklogd project

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

Am I affected?

Timeline

2014-11-02 00:55 UTCPublished CVE record published
2026-06-17 00:08 UTCUpdated Record last modified

sysklogd project sysklogd UPGRADE

Affected: <= 1.5 · 1.1 · 1.2 · 1.3 · 1.4 · 1.4.1

Fixed in: newer than 1.5

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 1.5 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade sysklogd

Note

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

rsyslog rsyslog UPGRADE

Affected: <= 7.6.5 · 8.1.0 · 8.1.1 · 8.1.2 · 8.1.3 · 8.1.4 · 8.1.5 · 8.1.6

Fixed in: newer than 7.6.5

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 7.6.5 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade rsyslog

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-2014-3634?

sysklogd: upgrade to newer than 1.5; rsyslog: upgrade to newer than 7.6.5. Exact commands for each OS are on this page.

Is CVE-2014-3634 being exploited?

CVE-2014-3634 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-2014-3634 affect?

CVE-2014-3634 affects sysklogd, rsyslog. Severity is high (CVSS 7.5). rsyslog before 7.6.6 and 8.x before 8.4.1 and sysklogd 1.5 and earlier allows remote attackers to cause a denial of service (crash), possibly execute arbitrary code, or have other unspecified impact via a crafted priority (PRI) value that t

How urgent is CVE-2014-3634?

Priority 55/100. High severity; EPSS top 5%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2014-3683 MEDIUM 5.0 UPGRADE UPGRADE Integer overflow in rsyslog before 7.6.7 and 8.x before 8.4.2 and sysklogd 1.5 and earlier allows remote attac

References

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