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Vulnerabilities

Vulnerability · CVE-2021-22898

curl 7.7 through 7.76.1 suffers from an information disclosure when the command line option, known as in libcurl, is used to send variable=content pairs to TELNET serv…

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-2021-22898. EPSS is 4.51%. 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
Low3.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
4.51%
Remediation
Advisory link
Affected products
cpe debian/debian linux · cpe fedoraproject/fedora · cpe haxx/curl · cpe oracle/communications cloud native core binding support function · cpe oracle/communications cloud native core network function cloud native environment · cpe oracle/communications cloud native core network repository function

curl 7.7 through 7.76.1 suffers from an information disclosure when the command line option, known as in libcurl, is used to send variable=content pairs to TELNET servers. Due to a flaw in the option parser for sending NEW_ENV variables, libcurl could be made to pass on uninitialized data from a stack based buffer to the server, resulting in potentially revealing sensitive internal information to the server using a clear-text network protocol.

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 debian/debian linux9.0
  • cpe fedoraproject/fedora33
  • cpe fedoraproject/fedora34
  • cpe haxx/curlversion 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 siemens/sinec infrastructure network servicesversion unspecified
  • cpe splunk/universal forwarderversion unspecified

How to fix CVE-2021-22898

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-2021-22898. EPSS is 4.51%. Act only if a listed version of the affected product is installed.

Which versions are affected?

Compare what you have installed with debian/debian linux 9.0; 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. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-200: Exposure of Sensitive Information; CWE-909. EPSS 4.51%. 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 7.7 through 7.76.1 suffers from an information disclosure when the command line option, known as in libcurl, is used to send variable=content pairs to TELNET servers. Due to a flaw in the option parser for sending NEW_ENV variables, libcurl could be made to pass on uninitialized data from a stack based buffer to the server, resulting in potentially revealing sensitive internal information to

  2. Oct 14, 2026 · NIST NVD

    Updated

    curl 7.7 through 7.76.1 suffers from an information disclosure when the command line option, known as in libcurl, is used to send variable=content pairs to TELNET servers. Due to a flaw in the option parser for sending NEW_ENV variables, libcurl could be made to pass on uninitialized data from a stack based buffer to the server, resulting in potentially revealing sensitive internal information to

Sources

  • CVE.orgVulnerability recordCVE-2021-22898

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-22898

    30-day exploitation probability 4.5%

    first.org
  • NIST NVDVulnerability recordCVE-2021-22898

    curl 7.7 through 7.76.1 suffers from an information disclosure when the command line option, known as in libcurl, is used to send variable=content pairs to TELNET servers. Due to a flaw in the option parser for sending NEW_ENV variables, libcurl could

    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.