{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-31135", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2025-03-26T15:04:52.627Z", "datePublished": "2025-04-01T22:03:09.405Z", "dateUpdated": "2026-01-28T22:27:22.773Z"}, "containers": {"cna": {"title": "Go-Guerrilla SMTP Daemon allows the PROXY command to be sent multiple times", "problemTypes": [{"descriptions": [{"cweId": "CWE-20", "lang": "en", "description": "CWE-20: Improper Input Validation", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/phires/go-guerrilla/security/advisories/GHSA-c2c3-pqw5-5p7c", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/phires/go-guerrilla/security/advisories/GHSA-c2c3-pqw5-5p7c"}, {"name": "https://github.com/phires/go-guerrilla/commit/d08fe22f8022d2bdedc136f9e4ba96f2fbbebf18", "tags": ["x_refsource_MISC"], "url": "https://github.com/phires/go-guerrilla/commit/d08fe22f8022d2bdedc136f9e4ba96f2fbbebf18"}], "affected": [{"vendor": "phires", "product": "go-guerrilla", "versions": [{"version": "< 1.6.7", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-01-28T22:27:22.773Z"}, "descriptions": [{"lang": "en", "value": "Go-Guerrilla SMTP Daemon is a lightweight SMTP server written in Go. Prior to 1.6.7, when ProxyOn is enabled, the PROXY command will be accepted multiple times, with later invocations overriding earlier ones. The proxy protocol only supports one initial PROXY header; anything after that is considered part of the exchange between client and server, so the client is free to send further PROXY commands with whatever data it pleases. go-guerrilla will treat these as coming from the reverse proxy, allowing a client to spoof its IP address. This vulnerability is fixed in 1.6.7."}], "source": {"advisory": "GHSA-c2c3-pqw5-5p7c", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2025-04-02T13:47:44.251072Z", "id": "CVE-2025-31135", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"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": "2025-04-02T13:48:00.609Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2025-31135", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2025-04-02T13:47:44.251072Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-04-02T13:47:55.253Z"}}], "cna": {"title": "Go-Guerrilla SMTP Daemon allows the PROXY command to be sent multiple times", "source": {"advisory": "GHSA-c2c3-pqw5-5p7c", "discovery": "UNKNOWN"}, "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}], "affected": [{"vendor": "phires", "product": "go-guerrilla", "versions": [{"status": "affected", "version": "< 1.6.7"}]}], "references": [{"url": "https://github.com/phires/go-guerrilla/security/advisories/GHSA-c2c3-pqw5-5p7c", "name": "https://github.com/phires/go-guerrilla/security/advisories/GHSA-c2c3-pqw5-5p7c", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/phires/go-guerrilla/commit/d08fe22f8022d2bdedc136f9e4ba96f2fbbebf18", "name": "https://github.com/phires/go-guerrilla/commit/d08fe22f8022d2bdedc136f9e4ba96f2fbbebf18", "tags": ["x_refsource_MISC"]}], "descriptions": [{"lang": "en", "value": "Go-Guerrilla SMTP Daemon is a lightweight SMTP server written in Go. Prior to 1.6.7, when ProxyOn is enabled, the PROXY command will be accepted multiple times, with later invocations overriding earlier ones. The proxy protocol only supports one initial PROXY header; anything after that is considered part of the exchange between client and server, so the client is free to send further PROXY commands with whatever data it pleases. go-guerrilla will treat these as coming from the reverse proxy, allowing a client to spoof its IP address. This vulnerability is fixed in 1.6.7."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-20", "description": "CWE-20: Improper Input Validation"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-01-28T22:27:22.773Z"}}}, "cveMetadata": {"cveId": "CVE-2025-31135", "state": "PUBLISHED", "dateUpdated": "2026-01-28T22:27:22.773Z", "dateReserved": "2025-03-26T15:04:52.627Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2025-04-01T22:03:09.405Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "Go-Guerrilla SMTP Daemon is a lightweight SMTP server written in Go. Prior to 1.6.7, when ProxyOn is enabled, the PROXY command will be accepted multiple times, with later invocations overriding earlier ones. The proxy protocol only supports one initial PROXY header; anything after that is considered part of the exchange between client and server, so the client is free to send further PROXY commands with whatever data it pleases. go-guerrilla will treat these as coming from the reverse proxy, allowing a client to spoof its IP address. This vulnerability is fixed in 1.6.7."}, {"lang": "es", "value": "Go-Guerrilla SMTP Daemon es un servidor SMTP ligero escrito en Go. Antes de la versi\u00f3n 1.6.7, al habilitar ProxyOn, el comando PROXY se aceptaba varias veces, y las invocaciones posteriores anulaban las anteriores. El protocolo proxy solo admite una cabecera PROXY inicial; cualquier acci\u00f3n posterior se considera parte del intercambio entre el cliente y el servidor, por lo que el cliente puede enviar m\u00e1s comandos PROXY con los datos que desee. Go-Guerrilla los tratar\u00e1 como si provinieran del proxy inverso, lo que permite al cliente falsificar su direcci\u00f3n IP. Esta vulnerabilidad se corrigi\u00f3 en la versi\u00f3n 1.6.7."}], "id": "CVE-2025-31135", "lastModified": "2026-01-28T23:15:50.267", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2025-04-01T22:15:21.437", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/phires/go-guerrilla/commit/d08fe22f8022d2bdedc136f9e4ba96f2fbbebf18"}, {"source": "security-advisories@github.com", "url": "https://github.com/phires/go-guerrilla/security/advisories/GHSA-c2c3-pqw5-5p7c"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-20"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

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