CVE-2017-11189: unrarlib.c in unrar-free 0.0.1 might allow remote attackers to cause a denial of service (NULL pointer derefer

This month

MEDIUM 6.5DOWNGRADE

CVE-2017-11189 is a medium-severity flaw (CVSS 6.5) affecting unrar-free. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

unrarlib.c in unrar-free 0.0.1 might allow remote attackers to cause a denial of service (NULL pointer dereference and application crash), which could be relevant if unrarlib is used as library code for a long-running application. NOTE: one of the several test cases in the references may be the same as what was separately reported as CVE-2017-14121.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.3% (top 29%)
CISA exploited list	No
Weakness	CWE-476
Published	2017-07-12
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: rarzilla

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

Am I affected?

Timeline

2017-07-12 16:29 UTCPublished CVE record published
2026-06-17 01:01 UTCUpdated Record last modified

rarzilla unrar-free DOWNGRADE

Affected: 0.0.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.0.1

1. Check installed version

apt-cache policy unrar-free || rpm -q unrar-free || unrar-free --version

2. No fixed release: DOWNGRADE to a release before 0.0.1 (Debian / Ubuntu)

apt-cache madison unrar-free sudo apt install unrar-free=<VERSION_BEFORE_0.0.1> sudo apt-mark hold unrar-free

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

dnf --showduplicates list unrar-free sudo dnf downgrade unrar-free-<VERSION_BEFORE_0.0.1> sudo dnf versionlock add unrar-free

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-2017-11189?

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

Is CVE-2017-11189 being exploited?

CVE-2017-11189 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-2017-11189 affect?

CVE-2017-11189 affects unrar-free. Severity is medium (CVSS 6.5). unrarlib.c in unrar-free 0.0.1 might allow remote attackers to cause a denial of service (NULL pointer dereference and application crash), which could be relevant if unrarlib is used as library code for a long-running application. NOTE: one

How urgent is CVE-2017-11189?

Priority 45/100. Public exploit reference

Related CVEs

CVE-2017-11190 HIGH 7.8 DOWNGRADE unrarlib.c in unrar-free 0.0.1, when _DEBUG_LOG mode is enabled, might allow remote attackers to cause a denia

References

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