CVE-2021-40439 Billion Laughs
An attacker can cause a denial of service in Apache OpenOffice by exploiting an XML entity expansion vulnerability in the bundled expat library via crafted ODF files.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-40439?
CVE-2021-40439 is a medium-severity vulnerability in Apache Openoffice, published on 7 Oct 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-611
Which versions are affected by CVE-2021-40439?
It affects 1 product.
Products include Apache Openoffice.
How do I fix CVE-2021-40439?
No fix has been published for CVE-2021-40439 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-40439 being exploited?
There is no known exploitation of CVE-2021-40439 in the wild and no public exploit code.
Other vulnerabilities in Apache Openoffice
Sources
Also known as GHSA-7579-q6rq-wf6r.