CVE-2021-22898

3.1 low SSVC exploitation: poc Modified

curl 7.7 through 7.76.1 suffers from an information disclosure when the `-t` command line option, known as `CURLOPT_TELNETOPTIONS` in libcurl, is used to send variable=content pairs to TELNET servers. Due to a flaw in the option parser for sending NEW_ENV variables, libcurl could be made to pass on uninitialized data from a stack based buffer to the server, resulting in potentially revealing sensitive internal information to the server using a clear-text network protocol.

Fix

Patch, vendor advisory and mitigation references on NVD 16

http://www.openwall.com/lists/oss-security/2021/07/21/4 Mailing List, Patch, Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf Patch, Third Party Advisory
https://curl.se/docs/CVE-2021-22898.html Exploit, Patch, Vendor Advisory
https://github.com/curl/curl/commit/39ce47f219b09c380b81f89fe54ac586c8db6bde Patch, Third Party Advisory
https://hackerone.com/reports/1176461 Exploit, Issue Tracking, Patch, Third Party Advisory
https://www.oracle.com//security-alerts/cpujul2021.html Patch, Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html Patch, Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2022.html Patch, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/07/21/4 Mailing List, Patch, Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf Patch, Third Party Advisory
https://curl.se/docs/CVE-2021-22898.html Exploit, Patch, Vendor Advisory
https://github.com/curl/curl/commit/39ce47f219b09c380b81f89fe54ac586c8db6bde Patch, Third Party Advisory
https://hackerone.com/reports/1176461 Exploit, Issue Tracking, Patch, Third Party Advisory
https://www.oracle.com//security-alerts/cpujul2021.html Patch, Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html Patch, Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2022.html Patch, Third Party Advisory

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

2026-10-15 00:45First seenCVSS 3.1 · haxx, debian, fedoraprojectNVD modified 2026-10-14 11:16

Affected (CPE criteria) 15

cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_cloud_native_core_binding_support_function:1.11.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_cloud_native_core_network_function_cloud_native_environment:1.10.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_cloud_native_core_network_repository_function:1.15.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_cloud_native_core_network_repository_function:1.15.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_cloud_native_core_network_slice_selection_function:1.8.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_cloud_native_core_service_communication_proxy:1.15.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:essbase:*:*:*:*:*:*:*:*
cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*
cpe:2.3:a:siemens:sinec_infrastructure_network_services:*:*:*:*:*:*:*:*
cpe:2.3:a:splunk:universal_forwarder:*:*:*:*:*:*:*:*
cpe:2.3:a:splunk:universal_forwarder:9.1.0:*:*:*:*:*:*:*

References 29

http://www.openwall.com/lists/oss-security/2021/07/21/4 Mailing List, Patch, Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf Patch, Third Party Advisory
https://curl.se/docs/CVE-2021-22898.html Exploit, Patch, Vendor Advisory
https://github.com/curl/curl/commit/39ce47f219b09c380b81f89fe54ac586c8db6bde Patch, Third Party Advisory
https://hackerone.com/reports/1176461 Exploit, Issue Tracking, Patch, Third Party Advisory
https://lists.apache.org/thread.html/rc713534b10f9daeee2e0990239fa407e2118e4aa9e88a7041177497c%40%3Cissues.guacamole.apache.org%3E Mailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/08/msg00017.html Mailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/08/msg00017.html Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FRUCW2UVNYUDZF72DQLFQR4PJEC6CF7V/ Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/POOC3UV7V6L4CJ5KA2PTWTNUV5Y72T3Q/ Mailing List, Third Party Advisory
https://www.debian.org/security/2022/dsa-5197 Third Party Advisory
https://www.oracle.com//security-alerts/cpujul2021.html Patch, Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html Patch, Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2022.html Patch, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/07/21/4 Mailing List, Patch, Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf Patch, Third Party Advisory
https://curl.se/docs/CVE-2021-22898.html Exploit, Patch, Vendor Advisory
https://github.com/curl/curl/commit/39ce47f219b09c380b81f89fe54ac586c8db6bde Patch, Third Party Advisory
https://hackerone.com/reports/1176461 Exploit, Issue Tracking, Patch, Third Party Advisory
https://lists.apache.org/thread.html/rc713534b10f9daeee2e0990239fa407e2118e4aa9e88a7041177497c%40%3Cissues.guacamole.apache.org%3E Mailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/08/msg00017.html Mailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/08/msg00017.html Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FRUCW2UVNYUDZF72DQLFQR4PJEC6CF7V/ Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/POOC3UV7V6L4CJ5KA2PTWTNUV5Y72T3Q/ Mailing List, Third Party Advisory
https://www.debian.org/security/2022/dsa-5197 Third Party Advisory
https://www.oracle.com//security-alerts/cpujul2021.html Patch, Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html Patch, Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2022.html Patch, Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-398330.html