THREATPORT/VULNERABILITY/CVE-2021-22922
MEDIUM SEVERITY

CVE-2021-22922

Curl vulnerability

CVSS
6.5
EPSS
4.3%
EPSS pct
90th
Exploited
No known
When curl is instructed to download content using the metalink feature, thecontents is verified against a hash provided in the metalink XML file.The metalink XML file points out to the client how to get the same contentfrom a set of different URLs, potentially hosted by different servers and theclient can then download the file from one or several of them. In a serial orparallel manner.If one of the servers hosting the contents has been breached and the contentsof the specific file on that server is replaced with a modified payload, curlshould detect this when the hash of the file mismatches after a completeddownload. It should remove the contents and instead try getting the contentsfrom another URL. This is not done, and instead such a hash mismatch is onlymentioned in text and the potentially malicious content is kept in the file ondisk.
Affected vendor
Haxx
Affected product
Curl
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Weakness type (CWE)
Published
2021-08-05

Risk analysis

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

Its EPSS score of 4.3% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 90% of all scored CVEs.

Check your external exposure to CVE-2021-22922

  • Confirm whether Haxx Curl is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2021-22922.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-22922

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2021-22922 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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