HOME VULNERABILITIESCVE-2019-9855

CRITICAL

CVE-2019-9855

CWE-417Published: September 6, 2019· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

LibreOffice is typically bundled with LibreLogo, a programmable turtle vector graphics script, which can execute arbitrary python commands contained with the document it is launched from. LibreOffice also has a feature where documents can specify that pre-installed scripts can be executed on various document script events such as mouse-over, etc. Protection was added to block calling LibreLogo from script event handers. However a Windows 8.3 path equivalence handling flaw left LibreOffice vulnerable under Windows that a document could trigger executing LibreLogo via a Windows filename pseudonym. This issue affects: Document Foundation LibreOffice 6.2 versions prior to 6.2.7; 6.3 versions prior to 6.3.1.

Technical Analysis

CVE-2019-9855 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

libreoffice1 product(s)

libreoffice

Microsoft1 product(s)

windows

openSUSE1 product(s)

leap

Source: NVD CPE · 4 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

CVE Program entry

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2019-09/msg00067.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2019-10/msg00055.html

ADVISORYhttps://www.libreoffice.org/about-us/security/advisories/CVE-2019-9855/

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2019-09/msg00067.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2019-10/msg00055.html

ADVISORYhttps://www.libreoffice.org/about-us/security/advisories/CVE-2019-9855/

All References (6)

→

http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00067.htmlMailing List · Third Party Advisory

→

http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00055.htmlMailing List · Third Party Advisory

→

https://www.libreoffice.org/about-us/security/advisories/CVE-2019-9855/Vendor Advisory

→

http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00067.htmlMailing List · Third Party Advisory

→

http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00055.htmlMailing List · Third Party Advisory

→

https://www.libreoffice.org/about-us/security/advisories/CVE-2019-9855/Vendor Advisory

Quick Facts

CVE IDCVE-2019-9855

CVSS Score9.8 / 10

SeverityCRITICAL

WeaknessCWE-417

CISA KEVNo

Affected3 vendor(s)

PublishedSep 6, 2019

Related CVEs (CWE-417)

CVE-2017-1000197

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2019-9855 in threat intel feeds
→Review IDS/IPS signatures for exploitation attempts

Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.

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