CVE-2021-22898

Name: CVE-2021-22898
Creator: NVD / NIST
Published: 2021-06-11T16:15:11.043+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

LOWCVSS 3.1/10EPSS 4.38%

Last modified Jun 17, 2026

CVE-2021-22898 is a low-severity vulnerability rated 3.1/10 on the CVSS scale. 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.. EPSS estimates a 4.38% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

3.1/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N

EPSS Probability

4.38%

90.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Haxx	Curl	>= 7.7, <= 7.76.1
Debian	Debian Linux	9.0
Fedoraproject	Fedora	33
Fedoraproject	Fedora	34
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
Oracle	Communications Cloud Native Core Network Repository Function	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	Essbase	< 11.1.2.4.047
Oracle	Essbase	>= 21.0, < 21.3
Oracle	Mysql Server	< 5.7.34
Oracle	Mysql Server	>= 8.0.15, < 8.0.25
Siemens	Sinec Infrastructure Network Services	< 1.0.1.1
Splunk	Universal Forwarder	>= 8.2.0, < 8.2.12
Splunk	Universal Forwarder	>= 9.0.0, < 9.0.6
Splunk	Universal Forwarder	9.1.0

References

http://www.openwall.com/lists/oss-security/2021/07/21/4Mailing List, Patch, Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdfPatch, Third Party Advisory
https://curl.se/docs/CVE-2021-22898.htmlExploit, Patch, Vendor Advisory
https://github.com/curl/curl/commit/39ce47f219b09c380b81f89fe54ac586c8db6bdePatch, Third Party Advisory
https://hackerone.com/reports/1176461Exploit, Issue Tracking, Patch, Third Party Advisory
https://lists.apache.org/thread.html/rc713534b10f9daeee2e0990239fa407e2118e4aa9e88a7041177497c%40%3Cissues.guacamole.apache.org%3EMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/08/msg00017.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/08/msg00017.htmlThird 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-5197Third Party Advisory
https://www.oracle.com//security-alerts/cpujul2021.htmlPatch, Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2022.htmlPatch, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/07/21/4Mailing List, Patch, Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdfPatch, Third Party Advisory
https://curl.se/docs/CVE-2021-22898.htmlExploit, Patch, Vendor Advisory
https://github.com/curl/curl/commit/39ce47f219b09c380b81f89fe54ac586c8db6bdePatch, Third Party Advisory
https://hackerone.com/reports/1176461Exploit, Issue Tracking, Patch, Third Party Advisory
https://lists.apache.org/thread.html/rc713534b10f9daeee2e0990239fa407e2118e4aa9e88a7041177497c%40%3Cissues.guacamole.apache.org%3EMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/08/msg00017.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/08/msg00017.htmlThird 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-5197Third Party Advisory
https://www.oracle.com//security-alerts/cpujul2021.htmlPatch, Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2022.htmlPatch, Third Party Advisory

Timeline

Published: Jun 11, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-22898?

How severe is CVE-2021-22898?

CVE-2021-22898 has a CVSS score of 3.1/10 (LOW severity). The EPSS model estimates a 4.38% probability of exploitation in the next 30 days.

How do I fix CVE-2021-22898?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-22898?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST