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Vulnerabilities

Vulnerability · CVE-2022-43552

A use after free vulnerability exists in curl <7.87.0.

Published Feb 9, 2023 · catalog updated Oct 14, 2026 · A use after free

Check if you run it

No confirmed exploitation is on record for CVE-2022-43552. EPSS is 2.71%. Act only if a listed version of A use after free is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (A use after free).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
2.71%
Remediation
Advisory link
Affected products
cpe apple/macos · cpe haxx/curl · cpe splunk/universal forwarder

A use after free vulnerability exists in curl <7.87.0. Curl can be asked to *tunnel* virtually all protocols it supports through an HTTP proxy. HTTP proxies can (and often do) deny such tunnel operations. When getting denied to tunnel the specific protocols SMB or TELNET, curl would use a heap-allocated struct after it had been freed, in its transfer shutdown code path.

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 apple/macosversion unspecified
  • cpe haxx/curlversion unspecified
  • cpe splunk/universal forwarder9.1.0

How to fix CVE-2022-43552

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-2022-43552. EPSS is 2.71%. Act only if a listed version of A use after free is installed.

Which versions are affected?

Compare what you have installed with splunk/universal forwarder 9.1.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-416: Use After Free. EPSS 2.71%. 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. Feb 9, 2023 · NIST NVD

    Detected

    A use after free vulnerability exists in curl <7.87.0. Curl can be asked to *tunnel* virtually all protocols it supports through an HTTP proxy. HTTP proxies can (and often do) deny such tunnel operations. When getting denied to tunnel the specific protocols SMB or TELNET, curl would use a heap-allocated struct after it had been freed, in its transfer shutdown code path.

  2. Oct 14, 2026 · NIST NVD

    Updated

    A use after free vulnerability exists in curl <7.87.0. Curl can be asked to *tunnel* virtually all protocols it supports through an HTTP proxy. HTTP proxies can (and often do) deny such tunnel operations. When getting denied to tunnel the specific protocols SMB or TELNET, curl would use a heap-allocated struct after it had been freed, in its transfer shutdown code path.

Sources

  • CVE.orgVulnerability recordCVE-2022-43552

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2022-43552

    30-day exploitation probability 2.7%

    first.org
  • NIST NVDVulnerability recordCVE-2022-43552

    A use after free vulnerability exists in curl <7.87.0. Curl can be asked to *tunnel* virtually all protocols it supports through an HTTP proxy. HTTP proxies can (and often do) deny such tunnel operations. When getting denied to tunnel the specific protocols SMB or TELNET, curl wo

    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.