Medium
Security advisory
curl supports the `-t` command line option, known as `CURLOPT_TELNETOPTIONS`in libcurl. This rarely used option is used to send variable=content pairs toTELNET servers.Due to flaw in the option parser for sending `NEW_ENV` variables, libcurlcould be made to pass on uninitialized data from a stack based buffer to theserver. Therefore potentially revealing sensitive internal information to theserver using a clear-text network protocol.This could happen because curl did not call and use sscanf() correctly whenparsing the string provided by the application.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-22925
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 06:13 UTC · Revision 1
Source evidence
curl supports the `-t` command line option, known as `CURLOPT_TELNETOPTIONS`in libcurl. This rarely used option is used to send variable=content pairs toTELNET servers.Due to flaw in the option parser for sending `NEW_ENV` variables, libcurlcould be made to pass on uninitialized data from a stack based buffer to theserver. Therefore potentially revealing sensitive internal information to theserver using a clear-text network protocol.This could happen because curl did not call and use sscanf() correctly whenparsing the string provided by the application.
osv:CVE-2021-22925
Complete source record
{
"id": "950e0f0a4d4b42165afd853aedeeec8c8dcb54598f076713730a3669eccc3b22",
"url": "https://osv.dev/vulnerability/CVE-2021-22925",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-22925",
"summary": "curl supports the `-t` command line option, known as `CURLOPT_TELNETOPTIONS`in libcurl. This rarely used option is used to send variable=content pairs toTELNET servers.Due to flaw in the option parser for sending `NEW_ENV` variables, libcurlcould be made to pass on uninitialized data from a stack based buffer to theserver. Therefore potentially revealing sensitive internal information to theserver using a clear-text network protocol.This could happen because curl did not call and use sscanf() correctly whenparsing the string provided by the application.",
"evidence": "osv:CVE-2021-22925",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2021-22925",
"aliases": [
"CURL-CVE-2021-22925",
"CVE-2021-22925"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/curl/curl",
"type": "GIT",
"events": [
{
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},
{
"fixed": "bfbde883af33397943df68a3ae01847a634d33bf"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "7.7"
},
{
"fixed": "7.78.0"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
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"curl-7_76_1",
"curl-7_76_0",
"curl-7_75_0",
"curl-7_74_0",
"curl-7_73_0",
"curl-7_72_0",
"curl-7_71_1",
"curl-7_71_0",
"curl-7_70_0",
"curl-7_69_1",
"curl-7_69_0",
"curl-7_68_0",
"curl-7_67_0",
"curl-7_66_0",
"curl-7_65_3",
"curl-7_65_2",
"curl-7_65_1",
"curl-7_65_0",
"curl-7_64_1",
"curl-7_64_0",
"curl-7_63_0",
"curl-7_62_0",
"curl-7_61_1",
"curl-7_61_0",
"curl-7_60_0",
"curl-7_59_0",
"curl-7_58_0",
"curl-7_57_0",
"curl-7_56_1",
"curl-7_56_0",
"curl-7_55_1",
"curl-7_55_0",
"curl-7_54_1",
"curl-7_54_0",
"curl-7_53_1",
"curl-7_53_0",
"curl-7_52_1",
"curl-7_52_0",
"curl-7_51_0",
"curl-7_50_3",
"curl-7_50_2",
"curl-7_50_1",
"curl-7_50_0",
"curl-7_49_1",
"curl-7_49_0",
"curl-7_48_0",
"curl-7_47_1",
"curl-7_47_0",
"curl-7_46_0",
"curl-7_45_0",
"curl-7_44_0",
"curl-7_43_0",
"curl-7_42_0",
"curl-7_41_0",
"curl-7_40_0",
"curl-7_39_0",
"curl-7_38_0",
"curl-7_37_1",
"curl-7_37_0",
"curl-7_36_0",
"curl-7_35_0",
"curl-7_34_0",
"curl-7_33_0",
"curl-7_32_0",
"curl-7_31_0",
"curl-7_30_0",
"curl-7_29_0",
"curl-7_28_1",
"curl-7_28_0",
"curl-7_27_0",
"curl-7_26_0",
"curl-7_25_0",
"curl-7_23_1",
"curl-7_23_0",
"curl-7_22_0",
"curl-7_21_7",
"curl-7_21_6",
"curl-7_21_5",
"curl-7_21_4",
"curl-7_21_3",
"curl-7_21_2",
"curl-7_21_1",
"curl-7_21_0",
"curl-7_20_1",
"curl-7_20_0",
"curl-7_19_7",
"curl-7_19_6",
"curl-7_19_5",
"curl-7_19_4",
"curl-7_19_3",
"curl-7_19_2",
"curl-7_19_1",
"curl-7_19_0",
"curl-7_18_2",
"curl-7_18_1",
"curl-7_18_0",
"curl-7_17_1",
"curl-7_17_0",
"curl-7_17_0-preldapfix",
"curl-7_16_4",
"curl-7_16_3",
"curl-7_16_2",
"curl-7_16_1",
"curl-7_16_0",
"curl-7_15_6-prepipeline",
"curl-7_15_5",
"curl-7_15_4",
"curl-7_15_3",
"curl-7_15_2",
"curl-7_15_1",
"curl-7_15_0",
"curl-7_14_1",
"curl-7_14_0",
"curl-7_13_2",
"curl-7_13_1",
"before_ftp_statemachine",
"curl-7_13_0",
"curl-7_12_3",
"curl-7_12_2",
"curl-7_12_1",
"curl-7_12_0",
"curl-7_11_2",
"curl-7_11_1",
"curl-7_11_0",
"curl-7_10_8",
"curl-7_10_7",
"curl-7_10_6",
"curl-7_10_5",
"curl-7_10_4",
"curl-7_10_3",
"curl-7_10_2",
"curl-7_10_1",
"curl-7_10",
"curl-7_9_8",
"curl-7_9_7",
"curl-7_9_7-pre2",
"curl-7_9_6",
"curl-7_9_5",
"curl-7_9_5-pre4",
"curl-7_9_5-pre2",
"curl-7_9_4",
"curl-7_9_3",
"curl-7_9_3-pre3",
"curl-7_9_3-pre2",
"curl-7_9_3-pre1",
"curl-7_9_2",
"curl-7_9_1",
"curl-7_9",
"before_urldata_rename",
"curl-7_8_1",
"curl-7_8_1-pre3",
"curl-7_8",
"curl-7_8-pre2",
"curl-7_7_3",
"curl-7_7_2",
"curl-7_7_1",
"curl-7_7"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-22925.json"
}
},
{
"ranges": [
{
"repo": "https://github.com/mysql/mysql-server",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"last_affected": "89713bf41c33528c3e7682d219dc838915f5af9a"
},
{
"introduced": "270fd3411e3d671a73ed9725940a30080f59ce6d"
},
{
"last_affected": "beb865a960b9a8a16cf999c323e46c5b0c67f21f"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "5.7.0"
},
{
"last_affected": "5.7.35"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "8.0.0"
},
{
"last_affected": "8.0.26"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"mysql-cluster-8.0.26",
"mysql-8.0.26",
"mysql-5.7.35",
"mysql-5.7.32",
"mysql-5.7.31",
"mysql-5.1.4",
"mysql-4.0.4",
"mysql-4.0.2",
"mysql-3.23.36",
"mysql-3.23.33",
"mysql-3.23.32",
"mysql-3.23.31",
"mysql-3.23.30-gamma",
"mysql-3.23.28-gamma",
"mysql-3.23.22-beta"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-22925.json"
}
}
],
"modified": "2026-10-24T10:30:37.085221263Z",
"provider": "osv",
"references": [
"https://cert-portal.siemens.com/productcert/html/ssa-389290.html",
"https://cert-portal.siemens.com/productcert/html/ssa-398330.html",
"https://cert-portal.siemens.com/productcert/html/ssa-484086.html",
"https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FRUCW2UVNYUDZF72DQLFQR4PJEC6CF7V/",
"https://security.gentoo.org/glsa/202212-01",
"https://security.netapp.com/advisory/ntap-20210902-0003/",
"https://support.apple.com/kb/HT212804",
"https://support.apple.com/kb/HT212805",
"https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf",
"https://hackerone.com/reports/1223882",
"https://www.oracle.com/security-alerts/cpujan2022.html",
"https://www.oracle.com/security-alerts/cpuoct2021.html"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:a:siemens:sinec_infrastructure_network_services:*:*:*:*:*:*:*:*"
],
"vendor_product": "siemens:sinec_infrastructure_network_services",
"extracted_events": [
{
"range": [
{
"fixed": "1.0.1.1"
}
],
"source": "CPE_RANGE"
}
]
},
{
"cpes": [
"cpe:2.3:a:siemens:sinema_remote_connect_server:*:*:*:*:*:*:*:*"
],
"vendor_product": "siemens:sinema_remote_connect_server",
"extracted_events": [
{
"range": [
{
"fixed": "3.1"
}
],
"source": "CPE_RANGE"
}
]
},
{
"cpes": [
"cpe:2.3:a:splunk:universal_forwarder:*:*:*:*:*:*:*:*"
],
"vendor_product": "splunk:universal_forwarder",
"extracted_events": [
{
"range": [
{
"introduced": "8.2.0"
},
{
"fixed": "8.2.12"
},
{
"introduced": "9.0.0"
},
{
"fixed": "9.0.6"
}
],
"source": "CPE_RANGE"
}
]
},
{
"cpes": [
"cpe:2.3:o:apple:mac_os_x:10.15.7:-:*:*:*:*:*:*",
"cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-001:*:*:*:*:*:*",
"cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-002:*:*:*:*:*:*",
"cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-003:*:*:*:*:*:*",
"cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-004:*:*:*:*:*:*"
],
"vendor_product": "apple:mac_os_x",
"extracted_events": [
{
"range": [
{
"introduced": "10.15.7-NA"
},
{
"last_affected": "10.15.7-NA"
},
{
"introduced": "10.15.7-security_update_2021\\-001"
},
{
"last_affected": "10.15.7-security_update_2021\\-001"
},
{
"introduced": "10.15.7-security_update_2021\\-002"
},
{
"last_affected": "10.15.7-security_update_2021\\-002"
},
{
"introduced": "10.15.7-security_update_2021\\-003"
},
{
"last_affected": "10.15.7-security_update_2021\\-003"
},
{
"introduced": "10.15.7-security_update_2021\\-004"
},
{
"last_affected": "10.15.7-security_update_2021\\-004"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
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"cpe:2.3:o:apple:macos:11.0:*:*:*:*:*:*:*",
"cpe:2.3:o:apple:macos:11.1.0:*:*:*:*:*:*:*",
"cpe:2.3:o:apple:macos:11.1:*:*:*:*:*:*:*",
"cpe:2.3:o:apple:macos:11.2.1:*:*:*:*:*:*:*",
"cpe:2.3:o:apple:macos:11.2:*:*:*:*:*:*:*",
"cpe:2.3:o:apple:macos:11.3.1:*:*:*:*:*:*:*",
"cpe:2.3:o:apple:macos:11.3:*:*:*:*:*:*:*",
"cpe:2.3:o:apple:macos:11.4:*:*:*:*:*:*:*",
"cpe:2.3:o:apple:macos:11.5:*:*:*:*:*:*:*"
],
"vendor_product": "apple:macos",
"extracted_events": [
{
"range": [
{
"introduced": "11.0"
},
{
"last_affected": "11.0"
},
{
"introduced": "11.0.1"
},
{
"last_affected": "11.0.1"
},
{
"introduced": "11.1"
},
{
"last_affected": "11.1"
},
{
"introduced": "11.1.0"
},
{
"last_affected": "11.1.0"
},
{
"introduced": "11.2"
},
{
"last_affected": "11.2"
},
{
"introduced": "11.2.1"
},
{
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},
{
"introduced": "11.3"
},
{
"last_affected": "11.3"
},
{
"introduced": "11.3.1"
},
{
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},
{
"introduced": "11.4"
},
{
"last_affected": "11.4"
},
{
"introduced": "11.5"
},
{
"last_affected": "11.5"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
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],
"vendor_product": "fedoraproject:fedora",
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{
"range": [
{
"introduced": "33"
},
{
"last_affected": "33"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.57:*:*:*:*:*:*:*",
"cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.58:*:*:*:*:*:*:*",
"cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.59:*:*:*:*:*:*:*"
],
"vendor_product": "oracle:peoplesoft_enterprise_peopletools",
"extracted_events": [
{
"range": [
{
"introduced": "8.57"
},
{
"last_affected": "8.57"
},
{
"introduced": "8.58"
},
{
"last_affected": "8.58"
},
{
"introduced": "8.59"
},
{
"last_affected": "8.59"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:splunk:universal_forwarder:9.1.0:*:*:*:*:*:*:*"
],
"vendor_product": "splunk:universal_forwarder",
"extracted_events": [
{
"range": [
{
"introduced": "9.1.0"
},
{
"last_affected": "9.1.0"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2021-22925",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 434124,
"published_at": "2021-08-05T21:15:11.467+00:00"
}