{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-7423","assignerOrgId":"ff89ba41-3aa1-4d27-914a-91399e9639e5","state":"PUBLISHED","assignerShortName":"AMZN","dateReserved":"2026-04-29T14:27:49.474Z","datePublished":"2026-04-29T18:36:28.353Z","dateUpdated":"2026-04-29T19:08:11.602Z"},"containers":{"cna":{"providerMetadata":{"orgId":"ff89ba41-3aa1-4d27-914a-91399e9639e5","shortName":"AMZN","dateUpdated":"2026-04-29T18:50:12.168Z"},"title":"Integer Underflow in ICMP Echo Reply Processing in FreeRTOS-Plus-TCP","problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-191","description":"CWE-191: Integer Underflow (Wrap or Wraparound)","type":"CWE"}]}],"impacts":[{"capecId":"CAPEC-153","descriptions":[{"lang":"en","value":"CAPEC-153: Input Data Manipulation"}]}],"affected":[{"vendor":"AWS","product":"FreeRTOS-Plus-TCP","collectionURL":"https://github.com/FreeRTOS/FreeRTOS-Plus-TCP","versions":[{"status":"affected","version":"4.0.0","lessThan":"4.2.6","versionType":"semver"},{"status":"affected","version":"4.3.0","lessThan":"4.4.1","versionType":"semver"},{"status":"unaffected","version":"4.2.6"},{"status":"unaffected","version":"4.4.1"}],"defaultStatus":"unaffected"}],"descriptions":[{"lang":"en","value":"Integer underflow in the ICMP and ICMPv6 echo reply handlers in FreeRTOS-Plus-TCP before V4.4.1 and V4.2.6 allows an adjacent network user to cause a denial of service (device crash) when outgoing ping support is enabled, because header sizes are subtracted from a packet length field without validating the field is large enough, resulting in a heap out-of-bounds read of up to approximately 65KB.\n\n\n\nTo mitigate this issue, users should upgrade to the fixed version when available.","supportingMedia":[{"type":"text/html","base64":false,"value":"<p>Integer underflow in the ICMP and ICMPv6 echo reply handlers in FreeRTOS-Plus-TCP before V4.4.1 and V4.2.6 allows an adjacent network user to cause a denial of service (device crash) when outgoing ping support is enabled, because header sizes are subtracted from a packet length field without validating the field is large enough, resulting in a heap out-of-bounds read of up to approximately 65KB.</p><p>To mitigate this issue, users should upgrade to the fixed version when available.</p>"}]}],"references":[{"url":"https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1","tags":["patch"]},{"url":"https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6","tags":["patch"]},{"url":"https://aws.amazon.com/security/security-bulletins/2026-021-aws/","tags":["vendor-advisory"]},{"url":"https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-7r59-2pgv-9v2r","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"ADJACENT_NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH","baseSeverity":"MEDIUM","baseScore":5.3,"vectorString":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"}},{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"ADJACENT","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"MEDIUM","baseScore":6,"vectorString":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}}],"x_generator":{"engine":"Vulnogram 1.0.1"},"source":{"discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-29T19:08:03.742434Z","id":"CVE-2026-7423","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-04-29T19:08:11.602Z"}}]}}