CVE-2025-52494

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{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "cve@mitre.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:adacore:ada_web_server:*:*:*:*:*:*:*:*", "matchCriteriaId": "423A6212-3351-4936-A734-62A46CD4850D", "versionEndExcluding": "26.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Adacore Ada Web Server (AWS) before 25.2 is vulnerable to a denial-of-service (DoS) condition due to improper handling of SSL handshakes during connection initialization. When a client initiates an HTTPS connection, the server performs the SSL handshake before assigning the connection to a processing slot. However, there is no specific timeout set for this phase, and the server uses the default socket timeout, which is effectively infinite. An attacker can exploit this by sending a malformed TLS ClientHello message with incorrect length values. This causes the server to wait indefinitely for data that never arrives, blocking the worker thread (Line) handling the connection. By opening multiple such connections, up to the server's maximum limit, the attacker can exhaust all available working threads, preventing the server from handling new, legitimate requests."}, {"lang": "es", "value": "Adacore Ada Web Server (AWS) antes de 25.2 es vulnerable a una condici\u00f3n de denegaci\u00f3n de servicio (DoS) debido a un manejo inadecuado de los handshakes SSL durante la inicializaci\u00f3n de la conexi\u00f3n. Cuando un cliente inicia una conexi\u00f3n HTTPS, el servidor realiza el handshake SSL antes de asignar la conexi\u00f3n a un slot de procesamiento. Sin embargo, no hay un tiempo de espera (timeout) espec\u00edfico configurado para esta fase, y el servidor utiliza el tiempo de espera (timeout) de socket predeterminado, que es efectivamente infinito. Un atacante puede explotar esto enviando un mensaje TLS ClientHello malformado con valores de longitud incorrectos. Esto hace que el servidor espere indefinidamente por datos que nunca llegan, bloqueando el hilo de trabajo (Line) que maneja la conexi\u00f3n. Al abrir m\u00faltiples conexiones de este tipo, hasta el l\u00edmite m\u00e1ximo del servidor, el atacante puede agotar todos los hilos de trabajo disponibles, impidiendo que el servidor maneje nuevas solicitudes leg\u00edtimas."}], "id": "CVE-2025-52494", "lastModified": "2026-11-07T18:10:00.200", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-52494", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-09-03T17:52:39.527064Z", "version": "2.0.3"}}]}, "published": "2025-09-03T18:15:35.120", "references": [{"source": "cve@mitre.org", "tags": ["Product"], "url": "https://adacore.com"}, {"source": "cve@mitre.org", "tags": ["Technical Description", "Vendor Advisory"], "url": "https://docs.adacore.com/corp/security-advisories/SEC.AWS-0095-v1.pdf"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}, {"lang": "en", "value": "CWE-770"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "aws: From CVEorg collector", "id": "2392939", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2392939"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["Adacore Ada Web Server (AWS) before 25.2 is vulnerable to a denial-of-service (DoS) condition due to improper handling of SSL handshakes during connection initialization. When a client initiates an HTTPS connection, the server performs the SSL handshake before assigning the connection to a processing slot. However, there is no specific timeout set for this phase, and the server uses the default socket timeout, which is effectively infinite. An attacker can exploit this by sending a malformed TLS ClientHello message with incorrect length values. This causes the server to wait indefinitely for data that never arrives, blocking the worker thread (Line) handling the connection. By opening multiple such connections, up to the server's maximum limit, the attacker can exhaust all available working threads, preventing the server from handling new, legitimate requests."], "name": "CVE-2025-52494", "public_date": "2025-09-03T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-52494\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-52494\nhttps://adacore.com\nhttps://docs.adacore.com/corp/security-advisories/SEC.AWS-0095-v1.pdf"], "statement": "This vulnerability arises because AWS performs the SSL handshake before assigning the connection to a processing slot and relies on the default socket timeout which is effectively infinite. This is a problem because a crafted message with incorrect length values can cause the SSL handshake to block indefinitely, leaving the worker thread stuck in the pre-slot state. If many such connections are opened, the worker threads on AWS could all be exhausted which would deny the AWS to other legitimate clients that want to connect to the server."}

{"created": "2025-09-04T13:12:22.962498+00:00", "updated": "2025-09-04T13:12:22.962561+00:00", "vendors": ["adacore", "adacore$PRODUCT$ada_web_server"]}