CVE-2014-6603: The SSHParseBanner function in SSH parser (app-layer-ssh.c) in Suricata before 2.0.4 allows remote attackers t

Q: How do I fix CVE-2014-6603?

suricata: upgrade to newer than 2.0.3-2. Exact commands for each OS are on this page.

Q: Is CVE-2014-6603 being exploited?

CVE-2014-6603 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-2014-6603 affect?

CVE-2014-6603 affects suricata. Severity is medium (CVSS 5.0). The SSHParseBanner function in SSH parser (app-layer-ssh.c) in Suricata before 2.0.4 allows remote attackers to bypass SSH rules, cause a denial of service (crash), or possibly have unspecified other impact via a crafted banner, which trigg

Q: How urgent is CVE-2014-6603?

Priority 44/100. Public exploit reference

This month

MEDIUM 5.0UPGRADE

CVE-2014-6603 is a medium-severity flaw (CVSS 5.0) affecting suricata. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The SSHParseBanner function in SSH parser (app-layer-ssh.c) in Suricata before 2.0.4 allows remote attackers to bypass SSH rules, cause a denial of service (crash), or possibly have unspecified other impact via a crafted banner, which triggers a large memory allocation or an out-of-bounds write.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	2.8% (top 13%)
CISA exploited list	No
Weakness	CWE-399
Published	2014-10-07
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: openinfosecfoundation

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

Am I affected?

Timeline

2014-10-07 14:55 UTCPublished CVE record published
2026-06-17 00:13 UTCUpdated Record last modified

openinfosecfoundation suricata UPGRADE

Affected: <= 2.0.3-2 · 2.0.1-1 · 2.0.1-2 · 2.0.2-1 · 2.0.2-2 · 2.0.3-1

Fixed in: newer than 2.0.3-2

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 2.0.3-2 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade suricata

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-2014-6603?

suricata: upgrade to newer than 2.0.3-2. Exact commands for each OS are on this page.

Is CVE-2014-6603 being exploited?

CVE-2014-6603 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-2014-6603 affect?

CVE-2014-6603 affects suricata. Severity is medium (CVSS 5.0). The SSHParseBanner function in SSH parser (app-layer-ssh.c) in Suricata before 2.0.4 allows remote attackers to bypass SSH rules, cause a denial of service (crash), or possibly have unspecified other impact via a crafted banner, which trigg

How urgent is CVE-2014-6603?

Priority 44/100. Public exploit reference

Software pages

Suricata and Snort vulnerabilities

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References

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