CVE-2018-3809: Information exposure through directory listings in serve 6.5.3 allows directory listing and file access even w

This week

MEDIUM 5.3REMOTEDOWNGRADE

CVE-2018-3809 is a medium-severity flaw (CVSS 5.3) affecting serve. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Information exposure through directory listings in serve 6.5.3 allows directory listing and file access even when they have been set to be ignored.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 36%)
CISA exploited list	No
Weakness	CWE-200
Published	2018-06-01
Last modified	2026-06-17

Publisher (CNA): HackerOne · Vendor: zeit

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

Am I affected?

Timeline

2018-06-01 19:29 UTCPublished CVE record published
2026-06-17 01:57 UTCUpdated Record last modified

zeit serve DOWNGRADE

Affected: 6.5.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.5.3

1. Check installed version

apt-cache policy serve || rpm -q serve || serve --version

2. No fixed release: DOWNGRADE to a release before 6.5.3 (Debian / Ubuntu)

apt-cache madison serve sudo apt install serve=<VERSION_BEFORE_6.5.3> sudo apt-mark hold serve

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

dnf --showduplicates list serve sudo dnf downgrade serve-<VERSION_BEFORE_6.5.3> sudo dnf versionlock add serve

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-2018-3809?

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

Is CVE-2018-3809 being exploited?

CVE-2018-3809 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-2018-3809 affect?

CVE-2018-3809 affects serve. Severity is medium (CVSS 5.3). Information exposure through directory listings in serve 6.5.3 allows directory listing and file access even when they have been set to be ignored.

How urgent is CVE-2018-3809?

Priority 44/100. Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2019-5417 HIGH 7.5 UPGRADE A path traversal vulnerability in serve npm package version 7.0.1 allows the attackers to read content of arbi
CVE-2019-5415 HIGH 7.5 DOWNGRADE A bug in handling the ignore files and directories feature in serve 6.5.3 allows an attacker to read a file or
CVE-2018-3718 MEDIUM 5.3 UPGRADE serve node module suffers from Improper Handling of URL Encoding by permitting access to ignored files if a fi
CVE-2018-3712 MEDIUM 6.5 UPGRADE serve node module before 6.4.9 suffers from a Path Traversal vulnerability due to not handling %2e (.) and %2f

References

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