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  4. CVE 2026 102551 improper verification of the source of a
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Back to active CVEs
Critical · CVSS 9.2CVE-2026-102551

Improper verification of the source of a communication channel in FreeRTOS-Plus-TCP Router Advertisement handlingCVE-2026-102551

Answer in brief

CVE-2026-102551 records a Critical severity (CVSS 9.2) vulnerability in Improper verification of the source of a communication channel in FreeRTOS-Plus-TCP Router Advertisement handling. The current sources do not mark it as known exploited. The current feed maps FreeRTOS/FreeRTOS-Plus-TCP (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 16, 2026Updated Oct 16, 2026Source checked Oct 16, 2026First seen by HOL Oct 16, 2026Material review Oct 16, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.2
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 9.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps FreeRTOS/FreeRTOS-Plus-TCP (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
FreeRTOS/FreeRTOS-Plus-TCPgeneric>=0 <=4.4.1Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for FreeRTOS/FreeRTOS-Plus-TCP.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Oct 16, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 16, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 16, 2026

Sources and claim methodology

  • Source referenceaws.amazon.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

Improper verification of the source of a communication channel in the IPv6 Router Advertisement handler in Amazon FreeRTOS-Plus-TCP before V4.4.2 might allow a remote third-party to influence an endpoint's IPv6 default gateway, on-link prefix, and address configuration via a crafted Router Advertisement. To remediate this issue, users should upgrade to version V4.4.2.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • IBM i is Affected by a Denial of Service in Digital Certificate ManagerSame generic ecosystem
  • IBM Db2 Genius Hub Improper verification of cryptographic signatureSame generic ecosystem
  • Ekko Studio through 0.7.36 Missing Authorization via /api/auth/locked-ipsSame generic ecosystem
  • APIPark through 1.9.7-beta Cross-Team Authorization Bypass via Team Query ParameterSame generic ecosystem
  • EFAK through 5.1.0 Privilege Escalation via /api/users REST APISame generic ecosystem
  • EFAK 5.0.0 through 5.1.0 Missing Authorization via /api/model-config Exposes API KeysSame generic ecosystem

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-940
Source
CVE List V5
Source checked
Oct 16, 2026
References
3 linked sources
Open source record