{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-2966", "assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5", "state": "PUBLISHED", "assignerShortName": "VulDB", "dateReserved": "2026-02-22T07:57:24.272Z", "datePublished": "2026-02-23T02:02:08.202Z", "dateUpdated": "2026-02-23T13:36:51.905Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "1af790b2-7ee1-4545-860a-a788eba489b5", "shortName": "VulDB", "dateUpdated": "2026-02-23T02:02:08.202Z"}, "title": "Cesanta Mongoose DNS Transaction ID dns.c mg_sendnsreq random values", "problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-330", "lang": "en", "description": "Insufficiently Random Values"}]}, {"descriptions": [{"type": "CWE", "cweId": "CWE-310", "lang": "en", "description": "Cryptographic Issues"}]}], "affected": [{"vendor": "Cesanta", "product": "Mongoose", "versions": [{"version": "7.0", "status": "affected"}, {"version": "7.1", "status": "affected"}, {"version": "7.2", "status": "affected"}, {"version": "7.3", "status": "affected"}, {"version": "7.4", "status": "affected"}, {"version": "7.5", "status": "affected"}, {"version": "7.6", "status": "affected"}, {"version": "7.7", "status": "affected"}, {"version": "7.8", "status": "affected"}, {"version": "7.9", "status": "affected"}, {"version": "7.10", "status": "affected"}, {"version": "7.11", "status": "affected"}, {"version": "7.12", "status": "affected"}, {"version": "7.13", "status": "affected"}, {"version": "7.14", "status": "affected"}, {"version": "7.15", "status": "affected"}, {"version": "7.16", "status": "affected"}, {"version": "7.17", "status": "affected"}, {"version": "7.18", "status": "affected"}, {"version": "7.19", "status": "affected"}, {"version": "7.20", "status": "affected"}], "cpes": ["cpe:2.3:a:cesanta:mongoose:*:*:*:*:*:*:*:*"], "modules": ["DNS Transaction ID Handler"]}], "descriptions": [{"lang": "en", "value": "A weakness has been identified in Cesanta Mongoose up to 7.20. The impacted element is the function mg_sendnsreq of the file /src/dns.c of the component DNS Transaction ID Handler. Executing a manipulation of the argument random can lead to insufficiently random values. The attack can be launched remotely. The attack requires a high level of complexity. The exploitability is regarded as difficult. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way."}], "metrics": [{"cvssV4_0": {"version": "4.0", "baseScore": 6.3, "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P", "baseSeverity": "MEDIUM"}}, {"cvssV3_1": {"version": "3.1", "baseScore": 3.7, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R", "baseSeverity": "LOW"}}, {"cvssV3_0": {"version": "3.0", "baseScore": 3.7, "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R", "baseSeverity": "LOW"}}, {"cvssV2_0": {"version": "2.0", "baseScore": 2.6, "vectorString": "AV:N/AC:H/Au:N/C:N/I:P/A:N/E:POC/RL:ND/RC:UR"}}], "timeline": [{"time": "2026-02-22T00:00:00.000Z", "lang": "en", "value": "Advisory disclosed"}, {"time": "2026-02-22T01:00:00.000Z", "lang": "en", "value": "VulDB entry created"}, {"time": "2026-02-22T09:02:36.000Z", "lang": "en", "value": "VulDB entry last update"}], "credits": [{"lang": "en", "value": "dwbruijn (VulDB User)", "type": "reporter"}], "references": [{"url": "https://vuldb.com/?id.347333", "name": "VDB-347333 | Cesanta Mongoose DNS Transaction ID dns.c mg_sendnsreq random values", "tags": ["vdb-entry", "technical-description"]}, {"url": "https://vuldb.com/?ctiid.347333", "name": "VDB-347333 | CTI Indicators (IOB, IOC, TTP, IOA)", "tags": ["signature", "permissions-required"]}, {"url": "https://vuldb.com/?submit.755304", "name": "Submit #755304 | Cesanta Mongoose Embedded Web Server 7.20 Insufficiently Random Values", "tags": ["third-party-advisory"]}, {"url": "https://github.com/dwBruijn/CVEs/blob/main/Mongoose/mg_sendnsreq.md", "tags": ["related"]}, {"url": "https://github.com/dwBruijn/CVEs/blob/main/Mongoose/mg_sendnsreq.md#poc", "tags": ["exploit"]}], "tags": ["x_open-source"]}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-02-23T13:36:36.825692Z", "id": "CVE-2026-2966", "options": [{"Exploitation": "poc"}, {"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": "2026-02-23T13:36:51.905Z"}}]}}

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "A weakness has been identified in Cesanta Mongoose up to 7.20. The impacted element is the function mg_sendnsreq of the file /src/dns.c of the component DNS Transaction ID Handler. Executing a manipulation of the argument random can lead to insufficiently random values. The attack can be launched remotely. The attack requires a high level of complexity. The exploitability is regarded as difficult. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way."}], "id": "CVE-2026-2966", "lastModified": "2026-02-23T03:15:59.373", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "LOW", "cvssData": {"accessComplexity": "HIGH", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 2.6, "confidentialityImpact": "NONE", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:H/Au:N/C:N/I:P/A:N", "version": "2.0"}, "exploitabilityScore": 4.9, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "cna@vuldb.com", "type": "Secondary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.7, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 1.4, "source": "cna@vuldb.com", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "HIGH", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.3, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "PROOF_OF_CONCEPT", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "cna@vuldb.com", "type": "Secondary"}]}, "published": "2026-02-23T03:15:59.373", "references": [{"source": "cna@vuldb.com", "url": "https://github.com/dwBruijn/CVEs/blob/main/Mongoose/mg_sendnsreq.md"}, {"source": "cna@vuldb.com", "url": "https://github.com/dwBruijn/CVEs/blob/main/Mongoose/mg_sendnsreq.md#poc"}, {"source": "cna@vuldb.com", "url": "https://vuldb.com/?ctiid.347333"}, {"source": "cna@vuldb.com", "url": "https://vuldb.com/?id.347333"}, {"source": "cna@vuldb.com", "url": "https://vuldb.com/?submit.755304"}], "sourceIdentifier": "cna@vuldb.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-310"}, {"lang": "en", "value": "CWE-330"}], "source": "cna@vuldb.com", "type": "Primary"}]}

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