THREATPORT/VULNERABILITY/CVE-2021-22924
LOW SEVERITY

CVE-2021-22924

Libcurl vulnerability

CVSS
3.7
EPSS
6.3%
EPSS pct
93th
Exploited
No known
libcurl keeps previously used connections in a connection pool for subsequenttransfers to reuse, if one of them matches the setup.Due to errors in the logic, the config matching function did not take 'issuercert' into account and it compared the involved paths *case insensitively*,which could lead to libcurl reusing wrong connections.File paths are, or can be, case sensitive on many systems but not all, and caneven vary depending on used file systems.The comparison also didn't include the 'issuer cert' which a transfer can setto qualify how to verify the server certificate.
Affected vendor
Haxx
Affected product
Libcurl
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness type (CWE)
Published
2021-08-05

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, high attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to low impact to confidentiality.

Its EPSS score of 6.3% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 93% of all scored CVEs.

Check your external exposure to CVE-2021-22924

  • Confirm whether Haxx Libcurl is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2021-22924.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-22924

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2021-22924 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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