THREATPORT/VULNERABILITY/CVE-2021-29440
HIGH SEVERITY

CVE-2021-29440

Grav vulnerability

CVSS
8.4
EPSS
30.6%
EPSS pct
98th
Exploited
No known
Grav is a file based Web-platform. Twig processing of static pages can be enabled in the front matter by any administrative user allowed to create or edit pages. As the Twig processor runs unsandboxed, this behavior can be used to gain arbitrary code execution and elevate privileges on the instance. The issue was addressed in version 1.7.11.
Affected vendor
Getgrav
Affected product
Grav
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H
Weakness type (CWE)
Published
2021-04-13

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring high privileges, user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 30.6% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 98% of all scored CVEs.

Check your external exposure to CVE-2021-29440

  • Confirm whether Getgrav Grav is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2021-29440.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-29440

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2021-29440 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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