CVE-2018-1000835: KeePassDX version <= 2.5.0.0beta17 contains a XML External Entity (XXE) vulnerability in kdbx file parser that

Q: How urgent is CVE-2018-1000835?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

This week

CRITICAL 10.0REMOTEDOWNGRADE

CVE-2018-1000835 is a critical-severity flaw (CVSS 10.0) affecting keepass dx. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

KeePassDX version <= 2.5.0.0beta17 contains a XML External Entity (XXE) vulnerability in kdbx file parser that can result in Disclosure of confidential data, denial of service, SSRF, port scanning.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	10.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.8% (top 22%)
CISA exploited list	No
Weakness	CWE-611
Published	2018-12-20
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: keepassdx

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

Am I affected?

Timeline

2018-12-20 15:29 UTCPublished CVE record published
2026-06-17 01:33 UTCUpdated Record last modified

keepassdx keepass dx DOWNGRADE

Affected: 2.5.0.0 beta1 · 2.5.0.0 beta10 · 2.5.0.0 beta11 · 2.5.0.0 beta12 · 2.5.0.0 beta13 · 2.5.0.0 beta14 · 2.5.0.0 beta15 · 2.5.0.0 beta16

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.5.0.0

1. Check installed version

apt-cache policy keepass-dx || rpm -q keepass-dx || keepass-dx --version

2. No fixed release: DOWNGRADE to a release before 2.5.0.0 (Debian / Ubuntu)

apt-cache madison keepass-dx sudo apt install keepass-dx=<VERSION_BEFORE_2.5.0.0> sudo apt-mark hold keepass-dx

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

dnf --showduplicates list keepass-dx sudo dnf downgrade keepass-dx-<VERSION_BEFORE_2.5.0.0> sudo dnf versionlock add keepass-dx

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-2018-1000835?

keepass dx: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-1000835 being exploited?

CVE-2018-1000835 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-2018-1000835 affect?

CVE-2018-1000835 affects keepass dx. Severity is critical (CVSS 10.0). KeePassDX version <= 2.5.0.0beta17 contains a XML External Entity (XXE) vulnerability in kdbx file parser that can result in Disclosure of confidential data, denial of service, SSRF, port scanning.

How urgent is CVE-2018-1000835?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

References

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