CVE-2025-61730 (GCVE-0-2025-61730)

Vulnerability from cvelistv5 – Published: 2026-01-28 19:30 – Updated: 2026-02-02 17:28
VLAI
Title
Handshake messages may be processed at the incorrect encryption level in crypto/tls
Summary
During the TLS 1.3 handshake if multiple messages are sent in records that span encryption level boundaries (for instance the Client Hello and Encrypted Extensions messages), the subsequent messages may be processed before the encryption level changes. This can cause some minor information disclosure if a network-local attacker can inject messages during the handshake.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-02 17:28 UTC
CWE
  • CWE-940 - Improper Verification of Source of a Communication Channel
Assigner
Go
References
Impacted products
Vendor Product Version
Go standard library crypto/tls Affected: 0 , < 1.24.12 (semver)
Affected: 1.25.0 , < 1.25.6 (semver)
Create a notification for this product.
Credits
Coia Prant (github.com/rbqvq)
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 5.3,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "LOW",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2025-61730",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-02-02T17:28:46.305649Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-02-02T17:28:49.572Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "crypto/tls",
          "product": "crypto/tls",
          "programRoutines": [
            {
              "name": "Conn.handleKeyUpdate"
            },
            {
              "name": "Conn.handshakeContext"
            },
            {
              "name": "clientHandshakeStateTLS13.establishHandshakeKeys"
            },
            {
              "name": "clientHandshakeStateTLS13.readServerFinished"
            },
            {
              "name": "clientHandshakeStateTLS13.sendClientFinished"
            },
            {
              "name": "serverHandshakeStateTLS13.checkForResumption"
            },
            {
              "name": "serverHandshakeStateTLS13.doHelloRetryRequest"
            },
            {
              "name": "serverHandshakeStateTLS13.sendServerParameters"
            },
            {
              "name": "serverHandshakeStateTLS13.sendServerFinished"
            },
            {
              "name": "serverHandshakeStateTLS13.readClientFinished"
            },
            {
              "name": "Conn.quicSetReadSecret"
            },
            {
              "name": "Conn.Handshake"
            },
            {
              "name": "Conn.HandshakeContext"
            },
            {
              "name": "Conn.Read"
            },
            {
              "name": "Conn.Write"
            },
            {
              "name": "Dial"
            },
            {
              "name": "DialWithDialer"
            },
            {
              "name": "Dialer.Dial"
            },
            {
              "name": "Dialer.DialContext"
            },
            {
              "name": "QUICConn.HandleData"
            },
            {
              "name": "QUICConn.Start"
            }
          ],
          "vendor": "Go standard library",
          "versions": [
            {
              "lessThan": "1.24.12",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThan": "1.25.6",
              "status": "affected",
              "version": "1.25.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Coia Prant (github.com/rbqvq)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "During the TLS 1.3 handshake if multiple messages are sent in records that span encryption level boundaries (for instance the Client Hello and Encrypted Extensions messages), the subsequent messages may be processed before the encryption level changes. This can cause some minor information disclosure if a network-local attacker can inject messages during the handshake."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-940: Improper Verification of Source of a Communication Channel",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-28T19:30:30.986Z",
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "shortName": "Go"
      },
      "references": [
        {
          "url": "https://go.dev/cl/724120"
        },
        {
          "url": "https://go.dev/issue/76443"
        },
        {
          "url": "https://groups.google.com/g/golang-announce/c/Vd2tYVM8eUc"
        },
        {
          "url": "https://pkg.go.dev/vuln/GO-2026-4340"
        }
      ],
      "title": "Handshake messages may be processed at the incorrect encryption level in crypto/tls"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
    "assignerShortName": "Go",
    "cveId": "CVE-2025-61730",
    "datePublished": "2026-01-28T19:30:30.986Z",
    "dateReserved": "2025-09-30T15:05:03.605Z",
    "dateUpdated": "2026-02-02T17:28:49.572Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-61730",
      "date": "2026-08-16",
      "epss": "0.00276",
      "percentile": "0.20023"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-61730\",\"sourceIdentifier\":\"security@golang.org\",\"published\":\"2026-01-28T20:16:09.940\",\"lastModified\":\"2026-06-17T09:50:48.643\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"During the TLS 1.3 handshake if multiple messages are sent in records that span encryption level boundaries (for instance the Client Hello and Encrypted Extensions messages), the subsequent messages may be processed before the encryption level changes. This can cause some minor information disclosure if a network-local attacker can inject messages during the handshake.\"},{\"lang\":\"es\",\"value\":\"Durante el handshake de TLS 1.3, si se env\u00edan m\u00faltiples mensajes en registros que cruzan los l\u00edmites del nivel de cifrado (por ejemplo, los mensajes Client Hello y Encrypted Extensions), los mensajes subsiguientes pueden ser procesados antes de que cambie el nivel de cifrado. Esto puede causar una revelaci\u00f3n de informaci\u00f3n menor si un atacante local de red puede inyectar mensajes durante el handshake.\"}],\"affected\":[{\"source\":\"security@golang.org\",\"affectedData\":[{\"vendor\":\"Go standard library\",\"product\":\"crypto/tls\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://pkg.go.dev\",\"packageName\":\"crypto/tls\",\"programRoutines\":[{\"name\":\"Conn.handleKeyUpdate\"},{\"name\":\"Conn.handshakeContext\"},{\"name\":\"clientHandshakeStateTLS13.establishHandshakeKeys\"},{\"name\":\"clientHandshakeStateTLS13.readServerFinished\"},{\"name\":\"clientHandshakeStateTLS13.sendClientFinished\"},{\"name\":\"serverHandshakeStateTLS13.checkForResumption\"},{\"name\":\"serverHandshakeStateTLS13.doHelloRetryRequest\"},{\"name\":\"serverHandshakeStateTLS13.sendServerParameters\"},{\"name\":\"serverHandshakeStateTLS13.sendServerFinished\"},{\"name\":\"serverHandshakeStateTLS13.readClientFinished\"},{\"name\":\"Conn.quicSetReadSecret\"},{\"name\":\"Conn.Handshake\"},{\"name\":\"Conn.HandshakeContext\"},{\"name\":\"Conn.Read\"},{\"name\":\"Conn.Write\"},{\"name\":\"Dial\"},{\"name\":\"DialWithDialer\"},{\"name\":\"Dialer.Dial\"},{\"name\":\"Dialer.DialContext\"},{\"name\":\"QUICConn.HandleData\"},{\"name\":\"QUICConn.Start\"}],\"versions\":[{\"version\":\"0\",\"lessThan\":\"1.24.12\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"1.25.0\",\"lessThan\":\"1.25.6\",\"versionType\":\"semver\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N\",\"baseScore\":5.3,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":3.9,\"impactScore\":1.4}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-02-02T17:28:46.305649Z\",\"id\":\"CVE-2025-61730\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"yes\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"1.24.12\",\"matchCriteriaId\":\"21FD9368-8AB3-404B-8599-BBF64EFE3C7B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"1.25.0\",\"versionEndExcluding\":\"1.25.6\",\"matchCriteriaId\":\"A547E844-78D2-4B17-B7A9-73E7B503D2CE\"}]}]}],\"references\":[{\"url\":\"https://go.dev/cl/724120\",\"source\":\"security@golang.org\",\"tags\":[\"Patch\"]},{\"url\":\"https://go.dev/issue/76443\",\"source\":\"security@golang.org\",\"tags\":[\"Patch\"]},{\"url\":\"https://groups.google.com/g/golang-announce/c/Vd2tYVM8eUc\",\"source\":\"security@golang.org\",\"tags\":[\"Release Notes\"]},{\"url\":\"https://pkg.go.dev/vuln/GO-2026-4340\",\"source\":\"security@golang.org\",\"tags\":[\"Vendor Advisory\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-06T11:11:37+00:00",
      "cve": "CVE-2025-61730",
      "id": "CVE-2025-61730",
      "initial_release_date": "2025-01-01T00:00:00+00:00",
      "product_status:fixed": "8",
      "product_status:known_affected": "208",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "crypto/tls: Handshake messages may be processed at the incorrect encryption level in crypto/tls",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-61730.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-12T16:48:59Z",
      "cve": "CVE-2025-61730",
      "id": "CVE-2025-61730",
      "initial_release_date": "2026-01-17T00:28:18Z",
      "product_status:known_affected": "24",
      "product_status:known_not_affected": "108",
      "product_status:recommended": "264",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-61730",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-61730.json",
      "version": "23"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"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:L/I:N/A:N\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"LOW\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-61730\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-02-02T17:28:46.305649Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-01-29T18:33:11.041Z\"}}], \"cna\": {\"title\": \"Handshake messages may be processed at the incorrect encryption level in crypto/tls\", \"credits\": [{\"lang\": \"en\", \"value\": \"Coia Prant (github.com/rbqvq)\"}], \"affected\": [{\"vendor\": \"Go standard library\", \"product\": \"crypto/tls\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"1.24.12\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"1.25.0\", \"lessThan\": \"1.25.6\", \"versionType\": \"semver\"}], \"packageName\": \"crypto/tls\", \"collectionURL\": \"https://pkg.go.dev\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"Conn.handleKeyUpdate\"}, {\"name\": \"Conn.handshakeContext\"}, {\"name\": \"clientHandshakeStateTLS13.establishHandshakeKeys\"}, {\"name\": \"clientHandshakeStateTLS13.readServerFinished\"}, {\"name\": \"clientHandshakeStateTLS13.sendClientFinished\"}, {\"name\": \"serverHandshakeStateTLS13.checkForResumption\"}, {\"name\": \"serverHandshakeStateTLS13.doHelloRetryRequest\"}, {\"name\": \"serverHandshakeStateTLS13.sendServerParameters\"}, {\"name\": \"serverHandshakeStateTLS13.sendServerFinished\"}, {\"name\": \"serverHandshakeStateTLS13.readClientFinished\"}, {\"name\": \"Conn.quicSetReadSecret\"}, {\"name\": \"Conn.Handshake\"}, {\"name\": \"Conn.HandshakeContext\"}, {\"name\": \"Conn.Read\"}, {\"name\": \"Conn.Write\"}, {\"name\": \"Dial\"}, {\"name\": \"DialWithDialer\"}, {\"name\": \"Dialer.Dial\"}, {\"name\": \"Dialer.DialContext\"}, {\"name\": \"QUICConn.HandleData\"}, {\"name\": \"QUICConn.Start\"}]}], \"references\": [{\"url\": \"https://go.dev/cl/724120\"}, {\"url\": \"https://go.dev/issue/76443\"}, {\"url\": \"https://groups.google.com/g/golang-announce/c/Vd2tYVM8eUc\"}, {\"url\": \"https://pkg.go.dev/vuln/GO-2026-4340\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"During the TLS 1.3 handshake if multiple messages are sent in records that span encryption level boundaries (for instance the Client Hello and Encrypted Extensions messages), the subsequent messages may be processed before the encryption level changes. This can cause some minor information disclosure if a network-local attacker can inject messages during the handshake.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"description\": \"CWE-940: Improper Verification of Source of a Communication Channel\"}]}], \"providerMetadata\": {\"orgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"shortName\": \"Go\", \"dateUpdated\": \"2026-01-28T19:30:30.986Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-61730\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-02-02T17:28:49.572Z\", \"dateReserved\": \"2025-09-30T15:05:03.605Z\", \"assignerOrgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"datePublished\": \"2026-01-28T19:30:30.986Z\", \"assignerShortName\": \"Go\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.