CVE-2021-22898

moderate-risk
Published 2021-06-11

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.

Do I need to act?

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0.13% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
3
CVSS 3.1/10 Low
NETWORK / HIGH complexity

Affected Products (15)

Affected Vendors

Debian Oracle Siemens Haxx Fedoraproject Splunk

References (28)

Mailing List http://www.openwall.com/lists/oss-security/2021/07/21/4
Patch https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
Exploit https://curl.se/docs/CVE-2021-22898.html
Patch https://github.com/curl/curl/commit/39ce47f219b09c380b81f89fe54ac586c8db6bde
Exploit https://hackerone.com/reports/1176461
Mailing List https://lists.apache.org/thread.html/rc713534b10f9daeee2e0990239fa407e2118e4aa9e...
Mailing List https://lists.debian.org/debian-lts-announce/2021/08/msg00017.html
Third Party Advisory https://lists.debian.org/debian-lts-announce/2022/08/msg00017.html
Mailing List https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...
Mailing List https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...
Third Party Advisory https://www.debian.org/security/2022/dsa-5197
Patch https://www.oracle.com//security-alerts/cpujul2021.html
Patch https://www.oracle.com/security-alerts/cpuapr2022.html
Patch https://www.oracle.com/security-alerts/cpujan2022.html
Mailing List http://www.openwall.com/lists/oss-security/2021/07/21/4
Patch https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
Exploit https://curl.se/docs/CVE-2021-22898.html
Patch https://github.com/curl/curl/commit/39ce47f219b09c380b81f89fe54ac586c8db6bde
Exploit https://hackerone.com/reports/1176461
Mailing List https://lists.apache.org/thread.html/rc713534b10f9daeee2e0990239fa407e2118e4aa9e...
and 8 more references
30
/ 100
moderate-risk
Severity 11/34 · Low
Exploitability 1/34 · Minimal
Exposure 18/34 · Moderate