THREATPORT/VULNERABILITY/CVE-2016-8622
LOW SEVERITY

CVE-2016-8622

Libcurl vulnerability

CVSS
3.7
EPSS
4.7%
EPSS pct
91th
Exploited
No known
The URL percent-encoding decode function in libcurl before 7.51.0 is called `curl_easy_unescape`. Internally, even if this function would be made to allocate a unscape destination buffer larger than 2GB, it would return that new length in a signed 32 bit integer variable, thus the length would get either just truncated or both truncated and turned negative. That could then lead to libcurl writing outside of its heap based buffer.
Affected vendor
Haxx
Affected product
Libcurl
CVSS vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness type (CWE)
  • CWE-122 — Heap-based Buffer Overflow
  • CWE-190 — Integer Overflow or Wraparound
  • CWE-787 — Out-of-bounds Write
Published
2018-07-31

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 integrity.

Its EPSS score of 4.7% 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-2016-8622

  • Confirm whether Haxx Libcurl is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2016-8622.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2016-8622

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2016-8622 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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