{"affected":[{"defaultStatus":"unaffected","product":"OpenSSL","source":"CNA: openssl","vendor":"OpenSSL","versions":[{"lessThan":"4.0.3","status":"affected","version":"4.0.0","versionType":"semver"},{"lessThan":"3.6.5","status":"affected","version":"3.6.0","versionType":"semver"},{"lessThan":"3.5.9","status":"affected","version":"3.5.0","versionType":"semver"},{"lessThan":"3.4.8","status":"affected","version":"3.4.0","versionType":"semver"},{"lessThan":"3.0.23","status":"affected","version":"3.0.0","versionType":"semver"},{"lessThan":"1.1.1zj","status":"affected","version":"1.1.1","versionType":"custom"}]},{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.7","versionType":"custom"}]},{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.7","versionType":"custom"}]},{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.7","versionType":"custom"}]},{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.7","versionType":"custom"}]},{"defaultStatus":"unknown","product":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.7","versionType":"custom"}]}],"cveId":"CVE-2026-75806","cwes":["CWE-1284"],"description":"Issue summary: An established DTLS 1.2 association using an AEAD cipher suite\ncan be terminated by a single unauthenticated datagram whose encrypted\nfragment is shorter than the mandatory explicit IV and authentication tag\noverhead.\n\nImpact summary: An attacker who can send a datagram that is routed to an\nexisting DTLS 1.2 association can tear that association down without knowing\nany key material. This is a Denial of Service limited to the targeted\nassociation. There is no memory safety or confidentiality impact.\n\nCWE: CWE-1284: Improper Validation of Specified Quantity in Input\n\nDescription: In TLS 1.2 and DTLS 1.2 every record protected by an AEAD cipher\nsuite carries an explicit IV followed by the ciphertext and an authentication\ntag. When decrypting such a record the record layer passed the record length to\nthe cipher implementation before checking that the record was long enough to\ncontain the explicit IV and the tag. For a record shorter than that overhead the\ncipher implementation rejected the impossible length, and the record layer\ntreated this as an internal failure and raised a fatal internal_error alert\ninstead of treating the record as one that failed authentication.\n\nIn TLS 1.2 the same record causes a fatal internal_error alert instead of the\nexpected bad_record_mac alert. Since any undecryptable record already\nterminates a TLS connection, this is a protocol conformance issue rather than\na security issue in TLS.\n\nThe fix validates the record length against the explicit IV and tag length\nbefore any AEAD processing, so that TLS reports bad_record_mac and DTLS\nsilently discards the record.\n\nFIPS impact: no\nThe affected code is outside the FIPS module boundary.","epss":{"date":"2026-11-09","percentile":0.66008,"score":0.01104},"exploits":[],"kev":null,"metrics":[{"score":5.3,"severity":"medium","source":"ADP: CISA-ADP","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"}],"modifiedAt":1794314985393,"publishedAt":1790695941457,"references":[{"source":"CNA: openssl","tags":["vendor-advisory"],"url":"https://openssl-library.org/news/secadv/20260929.txt"},{"source":"CNA: openssl","tags":["patch"],"url":"https://github.com/openssl/openssl/commit/04728a289a823e68137f88da016cb9ede307217d"},{"source":"CNA: openssl","tags":["patch"],"url":"https://github.com/openssl/openssl/commit/050b275cd671a6eed1d6457642d41a5a77aab972"},{"source":"CNA: openssl","tags":["patch"],"url":"https://github.com/openssl/openssl/commit/3a4589d015a9049d47b66f186cf50a8711343a1d"},{"source":"CNA: openssl","tags":["patch"],"url":"https://github.com/openssl/openssl/commit/5af82fefbaf2b5fec2fc0e1d87f112844902f01d"},{"source":"ADP: siemens-SADP","tags":[],"url":"https://cert-portal.siemens.com/productcert/html/ssa-457936.html"}],"remediation":[{"kind":"fix","source":"CNA: openssl","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/openssl/openssl/commit/04728a289a823e68137f88da016cb9ede307217d"},{"kind":"fix","source":"CNA: openssl","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/openssl/openssl/commit/050b275cd671a6eed1d6457642d41a5a77aab972"},{"kind":"fix","source":"CNA: openssl","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/openssl/openssl/commit/3a4589d015a9049d47b66f186cf50a8711343a1d"},{"kind":"fix","source":"CNA: openssl","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/openssl/openssl/commit/5af82fefbaf2b5fec2fc0e1d87f112844902f01d"}],"revision":"ba4303537e0caa5913497d5d385cee28b773ec01cb484fe43301af8d652acbfe","sources":[{"modifiedAt":1794314985393,"name":"CNA: openssl","retrievedAt":1794316756441,"url":"https://www.cve.org/CVERecord?id=CVE-2026-75806"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794316770702,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-75806"}],"ssvc":{"assessedAt":1790700767298,"automatable":"yes","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"Unauthenticated and Undersized DTLS 1.2 AEAD Record Causes DoS","updatedAt":1794316770702}