THREATPORT/VULNERABILITY/CVE-2021-30465
HIGH SEVERITY

CVE-2021-30465

Runc vulnerability

CVSS
8.5
EPSS
6.6%
EPSS pct
93th
Exploited
No known
runc before 1.0.0-rc95 allows a Container Filesystem Breakout via Directory Traversal. To exploit the vulnerability, an attacker must be able to create multiple containers with a fairly specific mount configuration. The problem occurs via a symlink-exchange attack that relies on a race condition.
Affected vendor
Linuxfoundation
Affected product
Runc
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness type (CWE)
Published
2021-05-27

Risk analysis

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

Its EPSS score of 6.6% 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-2021-30465

  • Confirm whether Linuxfoundation Runc is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2021-30465.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-30465

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2021-30465 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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