CVE-2018-4000: An exploitable double-free vulnerability exists in the Office Open XML parser of Atlantis Word Processor, vers

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HIGH 7.8DOWNGRADE

CVE-2018-4000 is a high-severity flaw (CVSS 7.8) affecting atlantis word processor. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An exploitable double-free vulnerability exists in the Office Open XML parser of Atlantis Word Processor, version 3.2.5.0. A specially crafted document can cause a TTableRow instance to be referenced twice, resulting in a double-free vulnerability when both the references go out of scope. An attacker must convince a victim to open a document in order to trigger this vulnerability.

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.0% (top 36%)
CISA exploited list	No
Weakness	CWE-415
Published	2018-10-01
Last modified	2026-06-17

Publisher (CNA): Talos · Vendor: atlantiswordprocessor

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-10-01 20:29 UTCPublished CVE record published
2026-06-17 01:58 UTCUpdated Record last modified

atlantiswordprocessor atlantis word processor DOWNGRADE

Affected: 3.2.5.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.2.5.0

1. Check installed version

apt-cache policy atlantis-word-processor || rpm -q atlantis-word-processor || atlantis-word-processor --version

2. No fixed release: DOWNGRADE to a release before 3.2.5.0 (Debian / Ubuntu)

apt-cache madison atlantis-word-processor sudo apt install atlantis-word-processor=<VERSION_BEFORE_3.2.5.0> sudo apt-mark hold atlantis-word-processor

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list atlantis-word-processor sudo dnf downgrade atlantis-word-processor-<VERSION_BEFORE_3.2.5.0> sudo dnf versionlock add atlantis-word-processor

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2018-4000?

atlantis word processor: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-4000 being exploited?

CVE-2018-4000 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2018-4000 affect?

CVE-2018-4000 affects atlantis word processor. Severity is high (CVSS 7.8). An exploitable double-free vulnerability exists in the Office Open XML parser of Atlantis Word Processor, version 3.2.5.0. A specially crafted document can cause a TTableRow instance to be referenced twice, resulting in a double-free vulner

How urgent is CVE-2018-4000?

Priority 48/100. High severity; Public exploit reference

Related CVEs

CVE-2018-4040 HIGH 7.8 DOWNGRADE An exploitable uninitialized pointer vulnerability exists in the rich text format parser of Atlantis Word Proc
CVE-2018-4039 HIGH 7.8 DOWNGRADE An exploitable out-of-bounds write vulnerability exists in the PNG implementation of Atlantis Word Processor,
CVE-2018-4038 HIGH 7.8 DOWNGRADE An exploitable arbitrary write vulnerability exists in the open document format parser of the Atlantis Word Pr
CVE-2018-4001 HIGH 7.8 DOWNGRADE An exploitable uninitialized pointer vulnerability exists in the Office Open XML parser of Atlantis Word Proce
CVE-2018-3999 HIGH 7.8 DOWNGRADE An exploitable stack-based buffer overflow vulnerability exists in the JPEG parser of Atlantis Word Processor,

References

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