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CVE Record

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

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.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

Suricata before 2.0.6 had a comparison bug that could let a remote attacker bypass some intrusion-prevention checks using a specially crafted HTTP request. This affects security monitoring and blocking confidence, not the protected application directly. Public sources do not provide CVSS scoring or evidence of active exploitation.

Executive priority

Treat this as a hygiene and assurance issue for network defense tooling. It can reduce prevention effectiveness, but available sources do not show direct system compromise or active exploitation. Prioritize upgrades where Suricata blocks internet-facing HTTP traffic.

Technical view

The vulnerable MemcmpLowercase function excluded the first byte from comparisons. In Suricata versions before 2.0.6, that could weaken HTTP inspection logic and allow bypass of intrusion-prevention functionality. The public record does not specify affected signatures, rule sets, or reliable exploit prevalence.

Likely exposure

Exposure is most likely where Suricata is deployed inline or for prevention, and the installed version is older than 2.0.6. Organizations using vendor or distribution packages should verify whether their package includes the 2.0.6 fix or a backport.

Exploitation context

The CVE describes remote bypass potential through crafted HTTP traffic. It is not listed in KEV, and the provided sources do not state active exploitation, public exploit availability, or real-world incident use.

Researcher notes

Key uncertainty remains around practical impact: sources identify the faulty comparison behavior but do not enumerate affected rules, traffic patterns, or exploit reliability. Analysis should focus on Suricata version provenance, downstream patch status, and whether the sensor was deployed in prevention mode.

Mitigation direction

  • Upgrade Suricata to 2.0.6 or a later vendor-supported release.
  • Check distribution advisories for backported fixes in packaged Suricata builds.
  • Prioritize inline IPS deployments before passive monitoring sensors.
  • Review vendor guidance before applying compensating controls.
  • Keep Suricata rule sets and operational monitoring current.

Validation and detection

  • Inventory all Suricata sensors and record installed versions.
  • Confirm each deployment runs 2.0.6 or includes the relevant backport.
  • Check package changelogs or vendor advisories for the fix reference.
  • Validate inline sensors are still enforcing expected prevention policies.
  • Document any unsupported legacy sensors as residual risk.
Prepared
Confidence
medium
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
4Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

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