CVE-2017-1000200: tcmu-runner version 1.0.5 to 1.2.0 is vulnerable to a dbus triggered NULL pointer dereference in the tcmu-runn

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HIGH 7.5REMOTEDOWNGRADE

CVE-2017-1000200 is a high-severity flaw (CVSS 7.5) affecting tcmu-runner. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

tcmu-runner version 1.0.5 to 1.2.0 is vulnerable to a dbus triggered NULL pointer dereference in the tcmu-runner daemon's on_unregister_handler() function resulting in denial of service

Why this priority

High severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-476
Published	2017-11-17
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: tcmu-runner project

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

Am I affected?

Timeline

2017-11-17 02:29 UTCPublished CVE record published
2026-06-17 00:58 UTCUpdated Record last modified

tcmu-runner project tcmu-runner DOWNGRADE

Affected: 1.0.5 · 1.1.0 · 1.1.1 · 1.1.2 · 1.1.3 · 1.2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.5

1. Check installed version

apt-cache policy tcmu-runner || rpm -q tcmu-runner || tcmu-runner --version

2. No fixed release: DOWNGRADE to a release before 1.0.5 (Debian / Ubuntu)

apt-cache madison tcmu-runner sudo apt install tcmu-runner=<VERSION_BEFORE_1.0.5> sudo apt-mark hold tcmu-runner

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

dnf --showduplicates list tcmu-runner sudo dnf downgrade tcmu-runner-<VERSION_BEFORE_1.0.5> sudo dnf versionlock add tcmu-runner

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-2017-1000200?

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

Is CVE-2017-1000200 being exploited?

CVE-2017-1000200 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-2017-1000200 affect?

CVE-2017-1000200 affects tcmu-runner. Severity is high (CVSS 7.5). tcmu-runner version 1.0.5 to 1.2.0 is vulnerable to a dbus triggered NULL pointer dereference in the tcmu-runner daemon's on_unregister_handler() function resulting in denial of service

How urgent is CVE-2017-1000200?

Priority 49/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2021-3139 HIGH 8.1 UPGRADE In Open-iSCSI tcmu-runner 1.3.x, 1.4.x, and 1.5.x through 1.5.2, xcopy_locate_udev in tcmur_cmd_handler.c lack
CVE-2017-1000201 MEDIUM 5.5 DOWNGRADE The tcmu-runner daemon in tcmu-runner version 1.0.5 to 1.2.0 is vulnerable to a local denial of service attack
CVE-2017-1000199 HIGH 7.5 DOWNGRADE tcmu-runner version 0.91 up to 1.20 is vulnerable to information disclosure in handler_qcow.so resulting in no
CVE-2017-1000198 HIGH 7.5 DOWNGRADE tcmu-runner daemon version 0.9.0 to 1.2.0 is vulnerable to invalid memory references in the handler_glfs.so ha

References

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