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CVE Record

CVE-2021-35063: Suricata before 5.0.7 and 6.x before 6.0.3 has a "critical evasion."

Suricata before 5.0.7 and 6.x before 6.0.3 has a "critical evasion."

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

Suricata is a network security monitoring engine. This CVE describes a critical evasion in versions before 5.0.7 and in 6.x before 6.0.3, meaning traffic may avoid expected inspection. The business risk is reduced confidence in network detection, not direct system takeover based on the supplied evidence.

Executive priority

Treat this as a monitoring trust issue. It may let relevant traffic bypass expected Suricata inspection, reducing detection assurance. Upgrade should be prioritized where Suricata materially supports security operations.

Technical view

The public CVE record identifies an evasion issue affecting Suricata before 5.0.7 and 6.x before 6.0.3. The source bundle does not provide CVSS, CWE, protocol specifics, packet conditions, or exploit mechanics. Fixed upstream release versions are named, and Linux distribution advisories or trackers should be used for packaged deployments.

Likely exposure

Exposure is most likely where Suricata sensors, IDS, IPS, or monitoring stacks run vulnerable upstream or distribution-packaged versions. Environments depending on Suricata for detection coverage have higher operational impact.

Exploitation context

The supplied sources describe a critical evasion, but do not show active exploitation. CISA KEV status is false in the bundle, and no cited source here confirms exploitation in the wild.

Researcher notes

Evidence is sparse in the supplied bundle. Avoid assuming exploitability details beyond critical evasion and affected version ranges. Validate exposure by exact Suricata version and vendor package status rather than CPE data, which is not provided.

Mitigation direction

  • Upgrade Suricata to 5.0.7, 6.0.3, or a later supported release.
  • For Linux packages, apply vendor security updates from the relevant distribution.
  • Check OISF release notes and distribution advisories for deployment-specific guidance.
  • Prioritize sensors protecting high-value network segments or internet-facing services.

Validation and detection

  • Inventory all Suricata versions across sensors, appliances, and containers.
  • Confirm packaged builds include the vendor fix for CVE-2021-35063.
  • Review monitoring coverage for gaps during the vulnerable period.
  • Run normal regression checks to confirm Suricata starts, logs, and alerts after updating.
Prepared
Confidence
medium
Sources
9

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

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2021-35063 mapping review

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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
8Source 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

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.