THREATPORT/VULNERABILITY/CVE-2021-22925
MEDIUM SEVERITY

CVE-2021-22925

Curl vulnerability

CVSS
5.3
EPSS
4.9%
EPSS pct
91th
Exploited
No known
curl supports the `-t` command line option, known as `CURLOPT_TELNETOPTIONS`in libcurl. This rarely used option is used to send variable=content pairs toTELNET servers.Due to flaw in the option parser for sending `NEW_ENV` variables, libcurlcould be made to pass on uninitialized data from a stack based buffer to theserver. Therefore potentially revealing sensitive internal information to theserver using a clear-text network protocol.This could happen because curl did not call and use sscanf() correctly whenparsing the string provided by the application.
Affected vendor
Haxx
Affected product
Curl
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness type (CWE)
  • CWE-200 — Exposure of Sensitive Information
  • CWE-908 — Use of Uninitialized Resource
Published
2021-08-05

Risk analysis

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

Its EPSS score of 4.9% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 91% of all scored CVEs.

Check your external exposure to CVE-2021-22925

  • Confirm whether Haxx Curl is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2021-22925.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-22925

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2021-22925 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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