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CVE-2021-22890

Published: Apr 1, 2021Updated: Jun 9, 2025 Sources: CVE List NVD BDU csafCWE-300
NVD MITRE
3.7CVSSLOW
EPSS Score
3.1%
Top 13.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

curl 7.63.0 to and including 7.75.0 includes vulnerability that allows a malicious HTTPS proxy to MITM a connection due to bad handling of TLS 1.3 session tickets. When using a HTTPS proxy and TLS 1.3, libcurl can confuse session tickets arriving from the HTTPS proxy but work as if they arrived from the remote server and then wrongly "short-cut" the host handshake. When confusing the tickets, a HTTPS proxy can trick libcurl to use the wrong session ticket resume for the host and thereby circumvent the server TLS certificate check and make a MITM attack to be possible to perform unnoticed. Note that such a malicious HTTPS proxy needs to provide a certificate that curl will accept for the MITMed server for an attack to work - unless curl has been told to ignore the server certificate check.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:NI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-300CWE-290

Affected Products

https://github.com/curl/curln/a
libcurlhaxxOSS Libraries
fedorafedoraproject
On-premOS
Operating Systems / linux-distro
hci management nodenetappHardware Firmware
solidfirenetappHardware Firmware
haxxoss-projectSEOSS Librariesaka haxx.se
fedoraprojectoss-projectUSOperating Systemsaka fedora project
netappcommercialUSHardware Firmware
and 12 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Initial Access
View detailed technique mapping

References

https://hackerone.com/reports/1129529
hackerone.com
https://curl.se/docs/CVE-2021-22890.html
curl.se
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ITVWPVGLFISU5BJC2BXBRYSDXTXE2YGC/
lists.fedoraproject.org
and 25 more references View all →

Timeline

Published
Apr 1, 2021
Last Updated
Jun 9, 2025

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