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"cveMetadata": {
"cveId": "CVE-2023-6237",
"assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
"state": "PUBLISHED",
"assignerShortName": "openssl",
"dateReserved": "2023-11-21T10:16:34.346Z",
"datePublished": "2024-04-25T06:27:26.990Z",
"dateUpdated": "2026-05-12T10:41:05.568Z"
},
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{
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"status": "affected",
"version": "3.0.0",
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"status": "affected",
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"type": "finder",
"user": "00000000-0000-4000-9000-000000000000",
"value": "OSS-Fuzz"
},
{
"lang": "en",
"type": "remediation developer",
"user": "00000000-0000-4000-9000-000000000000",
"value": "Tomas Mraz"
}
],
"datePublic": "2024-01-15T00:00:00.000Z",
"descriptions": [
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"value": "Issue summary: Checking excessively long invalid RSA public keys may take
a long time.
Impact summary: Applications that use the function EVP_PKEY_public_check()
to check RSA public keys may experience long delays. Where the key that
is being checked has been obtained from an untrusted source this may lead
to a Denial of Service.
When function EVP_PKEY_public_check() is called on RSA public keys,
a computation is done to confirm that the RSA modulus, n, is composite.
For valid RSA keys, n is a product of two or more large primes and this
computation completes quickly. However, if n is an overly large prime,
then this computation would take a long time.
An application that calls EVP_PKEY_public_check() and supplies an RSA key
obtained from an untrusted source could be vulnerable to a Denial of Service
attack.
The function EVP_PKEY_public_check() is not called from other OpenSSL
functions however it is called from the OpenSSL pkey command line
application. For that reason that application is also vulnerable if used
with the '-pubin' and '-check' options on untrusted data.
The OpenSSL SSL/TLS implementation is not affected by this issue.
The OpenSSL 3.0 and 3.1 FIPS providers are affected by this issue."
}
],
"value": "Issue summary: Checking excessively long invalid RSA public keys may take\na long time.\n\nImpact summary: Applications that use the function EVP_PKEY_public_check()\nto check RSA public keys may experience long delays. Where the key that\nis being checked has been obtained from an untrusted source this may lead\nto a Denial of Service.\n\nWhen function EVP_PKEY_public_check() is called on RSA public keys,\na computation is done to confirm that the RSA modulus, n, is composite.\nFor valid RSA keys, n is a product of two or more large primes and this\ncomputation completes quickly. However, if n is an overly large prime,\nthen this computation would take a long time.\n\nAn application that calls EVP_PKEY_public_check() and supplies an RSA key\nobtained from an untrusted source could be vulnerable to a Denial of Service\nattack.\n\nThe function EVP_PKEY_public_check() is not called from other OpenSSL\nfunctions however it is called from the OpenSSL pkey command line\napplication. For that reason that application is also vulnerable if used\nwith the '-pubin' and '-check' options on untrusted data.\n\nThe OpenSSL SSL/TLS implementation is not affected by this issue.\n\nThe OpenSSL 3.0 and 3.1 FIPS providers are affected by this issue."
}
],
"metrics": [
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"other": {
"content": {
"text": "Low"
},
"type": "https://www.openssl.org/policies/secpolicy.html"
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],
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{
"descriptions": [
{
"cweId": "CWE-606",
"description": "CWE-606 Unchecked Input for Loop Condition",
"lang": "en",
"type": "CWE"
}
]
}
],
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"shortName": "openssl",
"dateUpdated": "2024-10-14T14:55:56.955Z"
},
"references": [
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"name": "OpenSSL Advisory",
"tags": [
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],
"url": "https://www.openssl.org/news/secadv/20240115.txt"
},
{
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"patch"
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{
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],
"source": {
"discovery": "UNKNOWN"
},
"title": "Excessive time spent checking invalid RSA public keys",
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{
"metrics": [
{
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"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 5.9,
"attackVector": "NETWORK",
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "HIGH",
"availabilityImpact": "HIGH",
"privilegesRequired": "NONE",
"confidentialityImpact": "NONE"
}
},
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2024-08-20T14:44:52.382969Z",
"id": "CVE-2023-6237",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
}
],
"title": "CISA ADP Vulnrichment",
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"dateUpdated": "2026-05-12T10:41:05.568Z"
},
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"vendor": "Siemens",
"product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem",
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"version": "0",
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