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"cveId": "CVE-2022-4450",
"assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
"state": "PUBLISHED",
"assignerShortName": "openssl",
"dateReserved": "2022-12-13T13:38:08.598Z",
"datePublished": "2023-02-08T19:04:04.874Z",
"dateUpdated": "2025-11-04T19:14:13.257Z"
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"product": "OpenSSL",
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"status": "affected",
"version": "3.0.0",
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"user": "00000000-0000-4000-9000-000000000000",
"value": "CarpetFuzz"
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{
"lang": "en",
"type": "reporter",
"user": "00000000-0000-4000-9000-000000000000",
"value": "Dawei Wang"
},
{
"lang": "en",
"type": "reporter",
"user": "00000000-0000-4000-9000-000000000000",
"value": "Marc Schönefeld"
},
{
"lang": "en",
"type": "remediation developer",
"user": "00000000-0000-4000-9000-000000000000",
"value": "Kurt Roeckx"
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{
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"datePublic": "2023-02-07T00:00:00.000Z",
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"value": "The function PEM_read_bio_ex() reads a PEM file from a BIO and parses and
decodes the \"name\" (e.g. \"CERTIFICATE\"), any header data and the payload data.
If the function succeeds then the \"name_out\", \"header\" and \"data\" arguments are
populated with pointers to buffers containing the relevant decoded data. The
caller is responsible for freeing those buffers. It is possible to construct a
PEM file that results in 0 bytes of payload data. In this case PEM_read_bio_ex()
will return a failure code but will populate the header argument with a pointer
to a buffer that has already been freed. If the caller also frees this buffer
then a double free will occur. This will most likely lead to a crash. This
could be exploited by an attacker who has the ability to supply malicious PEM
files for parsing to achieve a denial of service attack.
The functions PEM_read_bio() and PEM_read() are simple wrappers around
PEM_read_bio_ex() and therefore these functions are also directly affected.
These functions are also called indirectly by a number of other OpenSSL
functions including PEM_X509_INFO_read_bio_ex() and
SSL_CTX_use_serverinfo_file() which are also vulnerable. Some OpenSSL internal
uses of these functions are not vulnerable because the caller does not free the
header argument if PEM_read_bio_ex() returns a failure code. These locations
include the PEM_read_bio_TYPE() functions as well as the decoders introduced in
OpenSSL 3.0.
The OpenSSL asn1parse command line application is also impacted by this issue.
"
}
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"value": "The function PEM_read_bio_ex() reads a PEM file from a BIO and parses and\ndecodes the \"name\" (e.g. \"CERTIFICATE\"), any header data and the payload data.\nIf the function succeeds then the \"name_out\", \"header\" and \"data\" arguments are\npopulated with pointers to buffers containing the relevant decoded data. The\ncaller is responsible for freeing those buffers. It is possible to construct a\nPEM file that results in 0 bytes of payload data. In this case PEM_read_bio_ex()\nwill return a failure code but will populate the header argument with a pointer\nto a buffer that has already been freed. If the caller also frees this buffer\nthen a double free will occur. This will most likely lead to a crash. This\ncould be exploited by an attacker who has the ability to supply malicious PEM\nfiles for parsing to achieve a denial of service attack.\n\nThe functions PEM_read_bio() and PEM_read() are simple wrappers around\nPEM_read_bio_ex() and therefore these functions are also directly affected.\n\nThese functions are also called indirectly by a number of other OpenSSL\nfunctions including PEM_X509_INFO_read_bio_ex() and\nSSL_CTX_use_serverinfo_file() which are also vulnerable. Some OpenSSL internal\nuses of these functions are not vulnerable because the caller does not free the\nheader argument if PEM_read_bio_ex() returns a failure code. These locations\ninclude the PEM_read_bio_TYPE() functions as well as the decoders introduced in\nOpenSSL 3.0.\n\nThe OpenSSL asn1parse command line application is also impacted by this issue."
}
],
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"dateUpdated": "2024-02-04T09:06:50.535Z"
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"references": [
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"tags": [
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"url": "https://www.openssl.org/news/secadv/20230207.txt"
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{
"url": "https://security.gentoo.org/glsa/202402-08"
}
],
"source": {
"discovery": "UNKNOWN"
},
"title": "Double free after calling PEM_read_bio_ex",
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"version": "3.1",
"baseScore": 7.5,
"attackVector": "NETWORK",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"integrityImpact": "NONE",
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"availabilityImpact": "HIGH",
"privilegesRequired": "NONE",
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},
{
"other": {
"type": "ssvc",
"content": {
"id": "CVE-2022-4450",
"role": "CISA Coordinator",
"options": [
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"version": "2.0.3",
"timestamp": "2025-04-23T13:26:38.705489Z"
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"type": "CWE",
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"title": "CISA ADP Vulnrichment",
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