What’s Vulnerable › Vulnerabilities
CVE-2021-22898
- Severity: low (CVSS 3.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 4.5% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2021-06-11 · updated 2026-10-14
- Weakness: CWE-200
Description
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.
Affected products
- Debian Linux: 9.0
- Fedoraproject Fedora: 33, 34
- curl: from 7.7 through 7.76.1
- Oracle Communications Cloud Native Core Binding Support Function: 1.11.0
- Oracle Communications Cloud Native Core Network Function Cloud Native Environment: 1.10.0
- Oracle Communications Cloud Native Core Network Repository Function: 1.15.0, 1.15.1
- Oracle Communications Cloud Native Core Network Slice Selection Function: 1.8.0
- Oracle Communications Cloud Native Core Service Communication Proxy: 1.15.0
- Oracle Corporation Oracle Essbase: before 11.1.2.4.047; from 21.0 before 21.3 — fixed in 11.1.2.4.047, 21.3
- MySQL Server: before 5.7.34; from 8.0.15 before 8.0.25 — fixed in 5.7.34, 8.0.25
- Siemens Sinec Infrastructure Network Services: before 1.0.1.1 — fixed in 1.0.1.1
- Splunk Universal Forwarder: from 8.2.0 before 8.2.12; from 9.0.0 before 9.0.6; 9.1.0 — fixed in 8.2.12, 9.0.6
How to fix
Upgrade to a fixed version: Oracle Corporation Oracle Essbase 11.1.2.4.047, 21.3; MySQL Server 5.7.34, 8.0.25; Siemens Sinec Infrastructure Network Services 1.0.1.1; Splunk Universal Forwarder 8.2.12, 9.0.6. Check the vendor advisory for mitigations.
References
- http://www.openwall.com/lists/oss-security/2021/07/21/4
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
- https://curl.se/docs/CVE-2021-22898.html
- https://github.com/curl/curl/commit/39ce47f219b09c380b81f89fe54ac586c8db6bde
- https://hackerone.com/reports/1176461
- https://lists.apache.org/thread.html/rc713534b10f9daeee2e0990239fa407e2118e4aa9e88a7041177497c%40%3Cissues.guacamole.apache.org%3E
- https://lists.debian.org/debian-lts-announce/2021/08/msg00017.html
- https://lists.debian.org/debian-lts-announce/2022/08/msg00017.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FRUCW2UVNYUDZF72DQLFQR4PJEC6CF7V/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/POOC3UV7V6L4CJ5KA2PTWTNUV5Y72T3Q/
- https://www.debian.org/security/2022/dsa-5197
- https://www.oracle.com//security-alerts/cpujul2021.html
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