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vuln-cve/data/2026/54xxx/CVE-2026-54887.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-54887",
"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"state": "PUBLISHED",
"assignerShortName": "EEF",
"dateReserved": "2026-06-16T10:47:13.915Z",
"datePublished": "2026-07-02T16:06:04.156Z",
"dateUpdated": "2026-11-11T18:50:00.580Z"
},
"containers": {
"cna": {
"affected": [
{
"cpes": [
"cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"dtls_server_connection"
],
"packageName": "otp",
"packageURL": "pkg:software-id/erlang.org/otp",
"product": "OTP",
"programFiles": [
"lib/ssl/src/dtls_server_connection.erl"
],
"programRoutines": [
{
"name": "dtls_server_connection:initial_hello/3"
}
],
"vendor": "Erlang",
"versions": [
{
"changes": [
{
"at": "27.3.4.14",
"status": "unaffected"
},
{
"at": "28.5.0.3",
"status": "unaffected"
},
{
"at": "29.0.3",
"status": "unaffected"
}
],
"lessThan": "*",
"status": "affected",
"version": "20.0",
"versionType": "otp"
}
]
},
{
"cpes": [
"cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"dtls_server_connection"
],
"packageName": "ssl",
"packageURL": "pkg:otp/ssl?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp&vcs_url=git%2Bhttps:%2F%2Fgithub.com%2Ferlang%2Fotp.git",
"product": "OTP",
"programFiles": [
"src/dtls_server_connection.erl"
],
"programRoutines": [
{
"name": "dtls_server_connection:initial_hello/3"
}
],
"repo": "https://github.com/erlang/otp",
"vendor": "Erlang",
"versions": [
{
"changes": [
{
"at": "11.2.12.10",
"status": "unaffected"
},
{
"at": "11.6.0.3",
"status": "unaffected"
},
{
"at": "11.7.3",
"status": "unaffected"
}
],
"lessThan": "*",
"status": "affected",
"version": "8.2",
"versionType": "otp"
}
]
},
{
"collectionURL": "https://github.com",
"cpes": [
"cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"dtls_server_connection"
],
"packageName": "erlang/otp",
"packageURL": "pkg:github/erlang/otp",
"product": "OTP",
"programFiles": [
"lib/ssl/src/dtls_server_connection.erl"
],
"programRoutines": [
{
"name": "dtls_server_connection:initial_hello/3"
}
],
"repo": "https://github.com/erlang/otp",
"vendor": "Erlang",
"versions": [
{
"lessThan": "888e3bcd72d5406016b9e0de741026bc2a6f114d",
"status": "affected",
"version": "e594aad2f87aab39e99fccf9e021bc94e0bbf7d4",
"versionType": "git"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*",
"versionEndExcluding": "27.3.4.14",
"versionStartIncluding": "20.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*",
"versionEndExcluding": "28.5.0.3",
"versionStartIncluding": "28.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*",
"versionEndExcluding": "29.0.3",
"versionStartIncluding": "29.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Lukas Backström"
},
{
"lang": "en",
"type": "remediation developer",
"value": "Ingela Anderton Andin"
},
{
"lang": "en",
"type": "remediation reviewer",
"value": "Dan Gudmundsson"
}
],
"datePublic": "2026-07-02T16:06:04.000Z",
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "<p>Use of Default Cryptographic Key vulnerability in Erlang/OTP ssl (DTLS server) allows predictable DTLS cookie computation during the startup window, enabling source address verification bypass.</p>\n<p>On DTLS server startup, <code>dtls_server_connection:initial_hello/3</code> initializes <code>previous_cookie_secret</code> to the empty binary (<code>&lt;&lt;&gt;&gt;</code>) instead of a random value. Because HMAC with an empty key is deterministic, anyone who observes the plaintext <code>ClientHello</code> can compute <code>dtls_handshake:cookie(&lt;&lt;&gt;&gt;, IP, Port, Hello)</code> and forge a valid DTLS cookie before the first rotation of the cookie secret. The DTLS cookie (RFC 6347 §4.2.1) is a denial-of-service mitigation that prevents spoofed source IPs from forcing the server to allocate state and perform expensive cryptographic operations; it is not an authentication mechanism. During the window from server startup until the first secret rotation (0 to 15 seconds), an attacker who can observe the plaintext <code>ClientHello</code> can bypass the source address verification, enabling DTLS handshake amplification with spoofed source addresses.</p>\n<p>This vulnerability is associated with program file <code>lib/ssl/src/dtls_server_connection.erl</code> and program routine <code>dtls_server_connection:initial_hello/3</code>.</p>\n<p>This issue affects OTP from OTP&nbsp;20.0 before OTP&nbsp;27.3.4.14, OTP&nbsp;28.5.0.3, and OTP&nbsp;29.0.3, corresponding to ssl from 8.2 before 11.2.12.10, 11.6.0.3, and 11.7.3.</p>"
},
{
"base64": false,
"type": "text/markdown",
"value": "Use of Default Cryptographic Key vulnerability in Erlang/OTP ssl (DTLS server) allows predictable DTLS cookie computation during the startup window, enabling source address verification bypass.\n\nOn DTLS server startup, `dtls_server_connection:initial_hello/3` initializes `previous_cookie_secret` to the empty binary (`<<>>`) instead of a random value. Because HMAC with an empty key is deterministic, anyone who observes the plaintext `ClientHello` can compute `dtls_handshake:cookie(<<>>, IP, Port, Hello)` and forge a valid DTLS cookie before the first rotation of the cookie secret. The DTLS cookie (RFC 6347 §4.2.1) is a denial-of-service mitigation that prevents spoofed source IPs from forcing the server to allocate state and perform expensive cryptographic operations; it is not an authentication mechanism. During the window from server startup until the first secret rotation (0 to 15 seconds), an attacker who can observe the plaintext `ClientHello` can bypass the source address verification, enabling DTLS handshake amplification with spoofed source addresses.\n\nThis vulnerability is associated with program file `lib/ssl/src/dtls_server_connection.erl` and program routine `dtls_server_connection:initial_hello/3`.\n\nThis issue affects OTP from OTP 20.0 before OTP 27.3.4.14, OTP 28.5.0.3, and OTP 29.0.3, corresponding to ssl from 8.2 before 11.2.12.10, 11.6.0.3, and 11.7.3."
}
],
"value": "Use of Default Cryptographic Key vulnerability in Erlang/OTP ssl (DTLS server) allows predictable DTLS cookie computation during the startup window, enabling source address verification bypass.\n\nOn DTLS server startup, dtls_server_connection:initial_hello/3 initializes previous_cookie_secret to the empty binary (<<>>) instead of a random value. Because HMAC with an empty key is deterministic, anyone who observes the plaintext ClientHello can compute dtls_handshake:cookie(<<>>, IP, Port, Hello) and forge a valid DTLS cookie before the first rotation of the cookie secret. The DTLS cookie (RFC 6347 §4.2.1) is a denial-of-service mitigation that prevents spoofed source IPs from forcing the server to allocate state and perform expensive cryptographic operations; it is not an authentication mechanism. During the window from server startup until the first secret rotation (0 to 15 seconds), an attacker who can observe the plaintext ClientHello can bypass the source address verification, enabling DTLS handshake amplification with spoofed source addresses.\n\nThis vulnerability is associated with program file lib/ssl/src/dtls_server_connection.erl and program routine dtls_server_connection:initial_hello/3.\n\nThis issue affects OTP from OTP 20.0 before OTP 27.3.4.14, OTP 28.5.0.3, and OTP 29.0.3, corresponding to ssl from 8.2 before 11.2.12.10, 11.6.0.3, and 11.7.3."
}
],
"impacts": [
{
"capecId": "CAPEC-485",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-485 Signature Spoofing by Key Recreation"
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 6.3,
"baseSeverity": "MEDIUM",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "LOW",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-1394",
"description": "CWE-1394 Use of Default Cryptographic Key",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"shortName": "EEF",
"dateUpdated": "2026-11-11T18:50:00.580Z"
},
"references": [
{
"name": "DTLS Cookie Bypass During Startup",
"tags": [
"vendor-advisory",
"related"
],
"url": "https://github.com/erlang/otp/security/advisories/GHSA-p2m2-3c2w-8jp8"
},
{
"name": "EEF CNA record for CVE-2026-54887",
"tags": [
"related"
],
"url": "https://cna.erlef.org/cves/CVE-2026-54887.html"
},
{
"name": "OSV record EEF-CVE-2026-54887",
"tags": [
"related"
],
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-54887"
},
{
"name": "Erlang/OTP version ordering",
"tags": [
"x_version-scheme"
],
"url": "https://www.erlang.org/doc/system/versions.html#order-of-versions"
},
{
"name": "Introducing commit e594aad in erlang/otp",
"tags": [
"related"
],
"url": "https://github.com/erlang/otp/commit/e594aad2f87aab39e99fccf9e021bc94e0bbf7d4"
},
{
"name": "Fix commit 888e3bc in erlang/otp",
"tags": [
"patch"
],
"url": "https://github.com/erlang/otp/commit/888e3bcd72d5406016b9e0de741026bc2a6f114d"
}
],
"source": {
"discovery": "INTERNAL"
},
"title": "DTLS server cookie bypass during startup window due to empty initial cookie secret"
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-07-02T17:28:36.936306Z",
"id": "CVE-2026-54887",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"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": "2026-07-02T17:28:43.784Z"
}
}
]
}
}
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