{"id":"CVE-2025-11935","state":"PUBLISHED","title":"Forward Secrecy Violation in WolfSSL TLS 1.3","description":"With TLS 1.3 pre-shared key (PSK) a malicious or faulty server could ignore the request for PFS (perfect forward secrecy) and the client would continue on with the connection using PSK without PFS. This happened when a server responded to a ClientHello containing psk_dhe_ke without a key_share extension. The re-use of an authenticated PSK connection that on the clients side unexpectedly did not have PFS, reduces the security of the connection.","publishedAt":"2025-11-21T22:04:52.335Z","updatedAt":"2025-12-08T15:49:43.595Z","severity":{"score":6.3,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N","source":"wolfSSL"},"assigner":"wolfSSL","products":["wolfSSL wolfSSL"],"affected":[{"vendor":"wolfSSL","product":"wolfSSL","packageName":"wolfssl","defaultStatus":"unaffected","versions":[{"version":"3.12.0","status":"affected","lessThan":"5.8.4","versionType":"git"}],"collectionURL":"https://www.wolfssl.com/download","modules":["TLS"],"platforms":["Linux","MacOS"],"programFiles":["src/tls13.c","src/tls.c","wolfssl/internal.h"],"repo":"https://github.com/wolfSSL/wolfssl"}],"references":["https://github.com/wolfSSL/wolfssl","https://github.com/wolfSSL/wolfssl/pull/9112"],"weaknesses":["CWE-326"],"ingestedAt":"2026-10-29T20:08:31.050Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/11xxx/CVE-2025-11935.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-11935","state":"PUBLISHED","datePublished":"2025-11-21T22:04:52.335Z","dateUpdated":"2025-12-08T15:49:43.595Z","assignerShortName":"wolfSSL","assignerOrgId":"50d2cd11-d01a-48ed-9441-5bfce9d63b27","dateReserved":"2025-10-17T22:24:22.960Z"},"containers":{"cna":{"title":"Forward Secrecy Violation in WolfSSL TLS 1.3","descriptions":[{"lang":"en","value":"With TLS 1.3 pre-shared key (PSK) a malicious or faulty server could ignore the request for PFS (perfect forward secrecy) and the client would continue on with the connection using PSK without PFS. This happened when a server responded to a ClientHello containing psk_dhe_ke without a key_share extension. The re-use of an authenticated PSK connection that on the clients side unexpectedly did not have PFS, reduces the security of the connection."}],"affected":[{"vendor":"wolfSSL","product":"wolfSSL","packageName":"wolfssl","defaultStatus":"unaffected","versions":[{"version":"3.12.0","status":"affected","lessThan":"5.8.4","versionType":"git"}],"collectionURL":"https://www.wolfssl.com/download","modules":["TLS"],"platforms":["Linux","MacOS"],"programFiles":["src/tls13.c","src/tls.c","wolfssl/internal.h"],"repo":"https://github.com/wolfSSL/wolfssl"}],"references":[{"url":"https://github.com/wolfSSL/wolfssl"},{"url":"https://github.com/wolfSSL/wolfssl/pull/9112"}],"metrics":[{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":6.3,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-326","description":"CWE-326 Inadequate Encryption Strength","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"wolfSSL","orgId":"50d2cd11-d01a-48ed-9441-5bfce9d63b27","dateUpdated":"2025-12-08T15:49:43.595Z"},"credits":[{"lang":"en","type":"finder","value":"Jaehun Lee, Pohang University of Science and Technology (POSTECH)"},{"lang":"en","type":"coordinator","value":"Kyungmin Bae, Pohang University of Science and Technology (POSTECH)"}],"impacts":[{"capecId":"CAPEC-94","descriptions":[{"lang":"en","value":"CAPEC-94 Adversary in the Middle (AiTM)"}]}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 0.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2025-11-25T18:43:57.465371Z","id":"CVE-2025-11935","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-11-25T18:44:04.062Z"}}]}}}