THREATPORT/VULNERABILITY/CVE-2021-40439
MEDIUM SEVERITY

CVE-2021-40439

Openoffice vulnerability

CVSS
6.5
EPSS
3.4%
EPSS pct
88th
Exploited
No known
Apache OpenOffice has a dependency on expat software. Versions prior to 2.1.0 were subject to CVE-2013-0340 a "Billion Laughs" entity expansion denial of service attack and exploit via crafted XML files. ODF files consist of a set of XML files. All versions of Apache OpenOffice up to 4.1.10 are subject to this issue. expat in version 4.1.11 is patched.
Affected vendor
Apache
Affected product
Openoffice
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness type (CWE)
  • CWE-611 — XML External Entity (XXE) Reference
Published
2021-10-07

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 availability.

Its EPSS score of 3.4% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 88% of all scored CVEs.

Check your external exposure to CVE-2021-40439

  • Confirm whether Apache Openoffice is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2021-40439.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-40439

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2021-40439 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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