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Vulnerabilities

Vulnerability · CVE-2022-43551

A vulnerability exists in curl <7.87.0 HSTS check that could be bypassed to trick it to keep using HTTP.

Published Dec 23, 2022 · catalog updated Oct 14, 2026 · A vulnerability exists in

Check this week

CVE-2022-43551 is not in CISA KEV. FIRST estimates a 16.60% chance of exploitation in the next 30 days. Check whether you run A vulnerability exists in.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (A vulnerability exists in).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
16.60%
Remediation
Version ranges on file
Affected products
cpe fedoraproject/fedora · cpe haxx/curl · cpe netapp/active iq unified manager · cpe netapp/oncommand insight · cpe netapp/oncommand workflow automation · cpe netapp/snapcenter

A vulnerability exists in curl <7.87.0 HSTS check that could be bypassed to trick it to keep using HTTP. Using its HSTS support, curl can be instructed to use HTTPS instead of using an insecure clear-text HTTP step even when HTTP is provided in the URL. However, the HSTS mechanism could be bypassed if the host name in the given URL first uses IDN characters that get replaced to ASCII counterparts as part of the IDN conversion. Like using the character UTF-8 U+3002 (IDEOGRAPHIC FULL STOP) instead of the common ASCII full stop (U+002E) . Then in a subsequent request, it does not detect the HSTS state and makes a clear text transfer. Because it would store the info IDN encoded but look for it IDN decoded.

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 fedoraproject/fedora37
  • cpe haxx/curlversion unspecified
  • cpe netapp/active iq unified managerversion unspecified
  • cpe netapp/oncommand insightversion unspecified
  • cpe netapp/oncommand workflow automationversion unspecified
  • cpe netapp/snapcenterversion unspecified
  • cpe splunk/universal forwarderversion unspecified
  • stated curl< 7.87.0

How to fix CVE-2022-43551

What to do

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

Should you patch?

CVE-2022-43551 is not in CISA KEV. FIRST estimates a 16.60% chance of exploitation in the next 30 days. Check whether you run A vulnerability exists in.

Which versions are affected?

Compare what you have installed with 37, < 7.87.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-319: Cleartext Transmission of Sensitive Information. EPSS 16.60%. 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.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Dec 23, 2022 · NIST NVD

    Detected

    A vulnerability exists in curl <7.87.0 HSTS check that could be bypassed to trick it to keep using HTTP. Using its HSTS support, curl can be instructed to use HTTPS instead of using an insecure clear-text HTTP step even when HTTP is provided in the URL. However, the HSTS mechanism could be bypassed if the host name in the given URL first uses IDN characters that get replaced to ASCII counterparts

  2. Oct 14, 2026 · NIST NVD

    Updated

    A vulnerability exists in curl <7.87.0 HSTS check that could be bypassed to trick it to keep using HTTP. Using its HSTS support, curl can be instructed to use HTTPS instead of using an insecure clear-text HTTP step even when HTTP is provided in the URL. However, the HSTS mechanism could be bypassed if the host name in the given URL first uses IDN characters that get replaced to ASCII counterparts

Sources

  • CVE.orgVulnerability recordCVE-2022-43551

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2022-43551

    30-day exploitation probability 16.6%

    first.org
  • NIST NVDVulnerability recordCVE-2022-43551

    A vulnerability exists in curl <7.87.0 HSTS check that could be bypassed to trick it to keep using HTTP. Using its HSTS support, curl can be instructed to use HTTPS instead of using an insecure clear-text HTTP step even when HTTP is provided in the URL. However, the HSTS mechanis

    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.