CVE-2017-17718: The Net::LDAP (aka net-ldap) gem before 0.16.0 for Ruby has Missing SSL Certificate Validation.

This month

MEDIUM 5.9REMOTEDOWNGRADE

CVE-2017-17718 is a medium-severity flaw (CVSS 5.9) affecting net-ldap. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Net::LDAP (aka net-ldap) gem before 0.16.0 for Ruby has Missing SSL Certificate Validation.

Why this priority

Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.3% (top 29%)
CISA exploited list	No
Weakness	CWE-295
Published	2017-12-17
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: net-ldap project

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

Am I affected?

Timeline

2017-12-17 21:29 UTCPublished CVE record published
2026-06-17 01:11 UTCUpdated Record last modified

net-ldap project net-ldap DOWNGRADE

Affected: 0.0.5 · 0.1.0 · 0.1.1 · 0.2 · 0.2.1 · 0.2.2 · 0.3.0 · 0.3.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.0.5

1. Check installed version

apt-cache policy net-ldap || rpm -q net-ldap || net-ldap --version

2. No fixed release: DOWNGRADE to a release before 0.0.5 (Debian / Ubuntu)

apt-cache madison net-ldap sudo apt install net-ldap=<VERSION_BEFORE_0.0.5> sudo apt-mark hold net-ldap

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

dnf --showduplicates list net-ldap sudo dnf downgrade net-ldap-<VERSION_BEFORE_0.0.5> sudo dnf versionlock add net-ldap

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-2017-17718?

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

Is CVE-2017-17718 being exploited?

CVE-2017-17718 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-2017-17718 affect?

CVE-2017-17718 affects net-ldap. Severity is medium (CVSS 5.9). The Net::LDAP (aka net-ldap) gem before 0.16.0 for Ruby has Missing SSL Certificate Validation.

How urgent is CVE-2017-17718?

Priority 44/100. Remotely exploitable, no login, no user action

Software pages

Ruby vulnerabilities

Related CVEs

CVE-2014-0083 MEDIUM 5.5 UPGRADE MITIGATE The Ruby net-ldap gem before 0.11 uses a weak salt when generating SSHA passwords.

References

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