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Vulnerabilities

Vulnerability · CVE-2021-22897

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…

Published Jun 11, 2021 · catalog updated Oct 14, 2026 · the affected product

Check if you run it

No confirmed exploitation is on record for CVE-2021-22897. EPSS is 4.26%. Act only if a listed version of the affected product is installed.

Gaps on this record

  • No plain product name is stored. The page cannot tell you which product to check.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
4.26%
Remediation
Advisory link
Affected products
cpe haxx/curl · cpe netapp/cloud backup · cpe netapp/h300e firmware · cpe netapp/h300s firmware · cpe netapp/hci compute node firmware · cpe oracle/communications cloud native core binding support function

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe haxx/curlversion unspecified
  • cpe netapp/cloud backupversion unspecified
  • cpe netapp/h300e firmwareversion unspecified
  • cpe netapp/h300s firmwareversion unspecified
  • cpe netapp/hci compute node firmwareversion unspecified
  • cpe oracle/communications cloud native core binding support function1.11.0
  • cpe oracle/communications cloud native core network function cloud native environment1.10.0
  • cpe oracle/communications cloud native core network repository function1.15.0
  • cpe oracle/communications cloud native core network repository function1.15.1
  • cpe oracle/communications cloud native core network slice selection function1.8.0
  • cpe oracle/communications cloud native core service communication proxy1.15.0
  • cpe oracle/essbaseversion unspecified

How to fix CVE-2021-22897

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2021-22897. EPSS is 4.26%. Act only if a listed version of the affected product is installed.

Which versions are affected?

Compare what you have installed with oracle/communications cloud native core binding support function 1.11.0; oracle/communications cloud native core network function cloud native environment 1.10.0; oracle/communications cloud native core network repository function 1.15.0; oracle/communications cloud native core network repository function 1.15.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-668: Exposure of Resource to Wrong Sphere; CWE-840. EPSS 4.26%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 11, 2021 · NIST NVD

    Detected

    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

  2. Oct 14, 2026 · NIST NVD

    Updated

    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

Sources

  • CVE.orgVulnerability recordCVE-2021-22897

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-22897

    30-day exploitation probability 4.3%

    first.org
  • NIST NVDVulnerability recordCVE-2021-22897

    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

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.