Buffer overflow from a crafted DBF file

published 2021-09-23 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-19755

cvss: 7.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 50.6%; EPSS 50.6% chance of exploitation in 30 days, percentile 98%
public exploits: 0; none known

Apache OpenOffice opens dBase/DBF documents and shows the contents as spreadsheets. DBF are database files with data organized in fields. When reading DBF data the size of certain fields is not checked: the data is just copied into local variables. A carefully crafted document could overflow the allocated space, leading to the execution of arbitrary code by altering the contents of the program stack. This issue affects Apache OpenOffice up to and including version 4.1.10

Patch / fix

distros 1 links 2

libreoffice Debian 14, Debian 13, Debian 12 1:4.3.1-1

debian advisories DEBIAN-CVE-2021-33035

github.com/apache/openoffice@efddaef commit
openwall.com/lists/oss-security/2021/10/07/3 advisory

Exploit prediction

50.56% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.8	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD	2.0	6.8	AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

Apache Software Foundation Apache OpenOffice

Classification

Weakness

CWE-120 Buffer Copy without Checking Size of Input

References

github.com /apache/openoffice/commit/efddaef0151af3be16078cc4d88c6bae0f911e56#diff-ea66e734dd358922aba12ad4ba39c96bdc6cbd
patch, third-party-advisory
openwall.com /lists/oss-security/2021/10/07/3
mailing-list, patch, third-party-advisory
lists.apache.org /thread.html/r929c0c6a53cad64a1007b878342756badbb05ddd9b8f31a6d0b424cb%40%3Cannounce.apache.org%3E
mailing-list
lists.apache.org /thread.html/r1ab8532e11f41bc7ca057ac7e39cab25f2e1f9d5f4929788ae21c8b9%40%3Cusers.openoffice.apache.org%3E
mailing-list

Sources

CVE List CVE-2021-33035
NVD CVE-2021-33035

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary