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CVE-2021-22897

Published: Jun 11, 2021Updated: May 28, 2026 Sources: CVE List NVD BDU csafCWE-840
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
3.0%
Top 14.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

curl 7.61.0 through 7.76.1 suffers from exposure of data element to wrong session due to a mistake in the code for CURLOPT_SSL_CIPHER_LIST when libcurl is built to use the Schannel TLS library. The selected cipher set was stored in a single "static" variable in the library, which has the surprising side-effect that if an application sets up multiple concurrent transfers, the last one that sets the ciphers will accidentally control the set used by all transfers. In a worst-case scenario, this weakens transport security significantly.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-840CWE-668

Affected Products

curlhaxxOSS Libraries
communications cloud native core binding support functionoracle
On-prem
Databases / relational
communications cloud native core network function cloud native environmentoracle
On-premDatabase
Databases / data-warehouse-analytics
communications cloud native core network repository functionoracle
On-premDatabase
Databases / data-warehouse-analytics
communications cloud native core network slice selection functionoracle
On-premWeb App
Communications
haxxoss-projectSEOSS Librariesaka haxx.se
oraclecommercialUSDatabasesaka oracle corp.
and 22 more affected products View all →

Exploitability

Official Patch Available

References

https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
cert-portal.siemens.com
https://curl.se/docs/CVE-2021-22897.html
curl.se
https://github.com/curl/curl/commit/bbb71507b7bab52002f9b1e0880bed6a32834511
github.com
and 20 more references View all →

Timeline

Published
Jun 11, 2021
Last Updated
May 28, 2026

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