Attacker Value
Unknown
(0 users assessed)
Exploitability
Unknown
(0 users assessed)
User Interaction
None
Privileges Required
None
Attack Vector
Network
0

CVE-2021-22901

Disclosure Date: June 11, 2021 •
CVE-2021-22901 CVSS v3 Base Score: 8.1
Add MITRE ATT&CK tactics and techniques that apply to this CVE.

Description

curl 7.75.0 through 7.76.1 suffers from a use-after-free vulnerability resulting in already freed memory being used when a TLS 1.3 session ticket arrives over a connection. A malicious server can use this in rare unfortunate circumstances to potentially reach remote code execution in the client. When libcurl at run-time sets up support for TLS 1.3 session tickets on a connection using OpenSSL, it stores pointers to the transfer in-memory object for later retrieval when a session ticket arrives. If the connection is used by multiple transfers (like with a reused HTTP/1.1 connection or multiplexed HTTP/2 connection) that first transfer object might be freed before the new session is established on that connection and then the function will access a memory buffer that might be freed. When using that memory, libcurl might even call a function pointer in the object, making it possible for a remote code execution if the server could somehow manage to get crafted memory content into the correct place in memory.

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CVSS V3 Severity and Metrics
Base Score:
8.1 High
Impact Score:
5.9
Exploitability Score:
2.2
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector (AV):
Network
Attack Complexity (AC):
High
Privileges Required (PR):
None
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
High
Integrity (I):
High
Availability (A):
High

General Information

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
https://github.com/curl/curl 7.75.0 through 7.76.1
Prerequisites
Unknown
Discovered By
Unknown
PoC Author
Unknown
Metasploit Module
Unknown
Reporter
Unknown

Vendors

  • haxx,
  • netapp,
  • oracle,
  • siemens,
  • splunk

Products

  • active iq unified manager -,
  • cloud backup -,
  • communications cloud native core binding support function 1.11.0,
  • communications cloud native core network function cloud native environment 1.10.0,
  • communications cloud native core network repository function 1.15.0,
  • communications cloud native core network repository function 1.15.1,
  • communications cloud native core network slice selection function 1.8.0,
  • communications cloud native core service communication proxy 1.15.0,
  • curl,
  • essbase,
  • h300e firmware -,
  • h300s firmware -,
  • h410s firmware -,
  • h500e firmware -,
  • h500s firmware -,
  • h700e firmware -,
  • h700s firmware -,
  • hci compute node firmware -,
  • mysql server,
  • oncommand insight -,
  • oncommand workflow automation -,
  • sinec infrastructure network services,
  • snapcenter -,
  • solidfire & hci management node -,
  • solidfire baseboard management controller firmware -,
  • solidfire, enterprise sds & hci storage node -,
  • universal forwarder,
  • universal forwarder 9.1.0
Technical Analysis