THREATPORT/VULNERABILITY/CVE-2022-40303
HIGH SEVERITY

CVE-2022-40303

Libxml2 vulnerability

CVSS
7.5
EPSS
22.8%
EPSS pct
97th
Exploited
No known
An issue was discovered in libxml2 before 2.10.3. When parsing a multi-gigabyte XML document with the XML_PARSE_HUGE parser option enabled, several integer counters can overflow. This results in an attempt to access an array at a negative 2GB offset, typically leading to a segmentation fault.
Affected vendor
Xmlsoft
Affected product
Libxml2
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness type (CWE)
  • CWE-190 — Integer Overflow or Wraparound
Published
2022-11-23

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 high impact to availability.

Its EPSS score of 22.8% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 97% of all scored CVEs.

Check your external exposure to CVE-2022-40303

  • Confirm whether Xmlsoft Libxml2 is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2022-40303.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2022-40303

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2022-40303 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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