CVE-2021-22901

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Summary

CVECVE-2021-22901
StatePUBLISHED
Assignerhackerone
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-06-11 16:15:11 UTC
Updated2026-10-14 11:16:53 UTC
Descriptioncurl 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.

Risk And Classification

Primary CVSS: v3.1 8.1 HIGH from [email protected]

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

Problem Types: CWE-416 | CWE-416 Use After Free (CWE-416)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary8.1HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
2.0[email protected]Primary6.8AV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Medium
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial

AV:N/AC:M/Au:N/C:P/I:P/A:P

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Haxx Curl All All All All
Application Oracle Communications Cloud Native Core Binding Support Function 1.11.0 All All All
Application Oracle Communications Cloud Native Core Network Function Cloud Native Environment 1.10.0 All All All
Application Oracle Communications Cloud Native Core Network Repository Function 1.15.0 All All All
Application Oracle Communications Cloud Native Core Network Repository Function 1.15.1 All All All
Application Oracle Communications Cloud Native Core Network Slice Selection Function 1.8.0 All All All
Application Oracle Communications Cloud Native Core Service Communication Proxy 1.15.0 All All All
Application Oracle Essbase All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na Https//github.com/curl/curl affected 7.75.0 through 7.76.1 Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified

References

ReferenceSourceLinkTags
cert-portal.siemens.com/productcert/html/ssa-398330.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
Oracle Critical Patch Update Advisory - April 2022 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com Patch, Third Party Advisory
curl - TLS session caching disaster - CVE-2021-22901 af854a3a-2127-422b-91ae-364da2661108 curl.se Exploit, Patch, Vendor Advisory
Oracle Critical Patch Update Advisory - July 2021 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com Patch, Third Party Advisory
cert-portal.siemens.com/productcert/html/ssa-389290.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
Oracle Critical Patch Update Advisory - January 2022 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com Patch, Third Party Advisory
July 2021 MySQL Vulnerabilities in NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com Third Party Advisory
cert-portal.siemens.com/productcert/html/ssa-732250.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
cert-portal.siemens.com/productcert/pdf/ssa-732250.pdf af854a3a-2127-422b-91ae-364da2661108 cert-portal.siemens.com Third Party Advisory
June 2021 cURL/libcURL Vulnerabilities in NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com Third Party Advisory
cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf af854a3a-2127-422b-91ae-364da2661108 cert-portal.siemens.com Patch, Third Party Advisory
HackerOne af854a3a-2127-422b-91ae-364da2661108 hackerone.com Exploit, Issue Tracking, Third Party Advisory
openssl: associate/detach the transfer from connection · curl/curl@7f4a9a9 · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Patch, Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 20225 Oracle MySQL July 2021 Critical Patch Update (CPU July 2021)
  • 239451 Red Hat Update for Red Hat JBoss Core Services Apache HTTP Server 2.4.37 SP8 (RHSA-2021:2472)
  • 281101 Fedora Security Update for curl (FEDORA-2021-eb5b7c53a9)
  • 296065 Oracle Solaris 11.4 Support Repository Update (SRU) 39.107.1 Missing (CPUOCT2021)
  • 376367 Oracle Essbase Administration Services Security Update (CPUJAN2022)
  • 376550 Oracle Hypertext Transfer Protocol Server (HTTP Server) Multiple Vulnerabilities (CPUAPR2022)
  • 378599 Splunk Enterprise Third Party Package Updates for June (SVD-2023-0613)
  • 378883 Splunk Enterprise August Third Party Package Updates (SVD-2023-0808)
  • 500135 Alpine Linux Security Update for curl
  • 503786 Alpine Linux Security Update for curl
  • 590938 Siemens Industrial Devices Multiple Vulnerabilities (SSA-732250)
  • 591406 Siemens SIMATIC S7-1500 CPU GNU/Linux subsystem Multiple Vulnerabilities (SSB-439005, ICSA-22-104-13)
  • 690068 Free Berkeley Software Distribution (FreeBSD) Security Update for mysql (38a4a043-e937-11eb-9b84-d4c9ef517024)
  • 710078 Gentoo Linux cURL Multiple vulnerabilities (GLSA 202105-36)
  • 730155 McAfee Web Gateway Multiple Vulnerabilities(WP-3580, WP-3656, WP-3815, WP-3878, WP-3882, WP-3934,WP-3935, WP-3936, WP-3999)
  • 900067 CBL-Mariner Linux Security Update for curl 7.76.0
  • 901903 Common Base Linux Mariner (CBL-Mariner) Security Update for curl (6360-1)
  • 903125 Common Base Linux Mariner (CBL-Mariner) Security Update for curl (4370)
  • 91779 Cygwin Curl Package Multiple Security Vulnerabilities

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