CVE-2015-8954: The MemcmpLowercase function in Suricata before 2.0.6 improperly excludes the first byte from comparisons, whi

Q: How do I fix CVE-2015-8954?

suricata: upgrade to newer than 2.0.5. Exact commands for each OS are on this page.

Q: Is CVE-2015-8954 being exploited?

CVE-2015-8954 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-2015-8954 affect?

CVE-2015-8954 affects suricata. Severity is critical (CVSS 9.8). The MemcmpLowercase function in Suricata before 2.0.6 improperly excludes the first byte from comparisons, which might allow remote attackers to bypass intrusion-prevention functionality via a crafted HTTP request.

Q: How urgent is CVE-2015-8954?

Priority 61/100. Critical severity; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2015-8954 is a critical-severity flaw (CVSS 9.8) affecting suricata. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The MemcmpLowercase function in Suricata before 2.0.6 improperly excludes the first byte from comparisons, which might allow remote attackers to bypass intrusion-prevention functionality via a crafted HTTP request.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
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-264
Published	2017-03-20
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

2017-03-20 16:59 UTCPublished CVE record published
2026-06-17 00:35 UTCUpdated Record last modified

openinfosecfoundation suricata UPGRADE

Affected: <= 2.0.5

Fixed in: newer than 2.0.5

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 2.0.5 (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-2015-8954?

suricata: upgrade to newer than 2.0.5. Exact commands for each OS are on this page.

Is CVE-2015-8954 being exploited?

CVE-2015-8954 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-2015-8954 affect?

CVE-2015-8954 affects suricata. Severity is critical (CVSS 9.8). The MemcmpLowercase function in Suricata before 2.0.6 improperly excludes the first byte from comparisons, which might allow remote attackers to bypass intrusion-prevention functionality via a crafted HTTP request.

How urgent is CVE-2015-8954?

Priority 61/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Suricata and Snort vulnerabilities

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References

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