CVE-2017-17840: An issue was discovered in Open-iSCSI through 2.0.875

Q: How do I fix CVE-2017-17840?

open-iscsi: upgrade to newer than 2.0.875. Exact commands for each OS are on this page.

Q: Is CVE-2017-17840 being exploited?

CVE-2017-17840 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2017-17840 affect?

CVE-2017-17840 affects open-iscsi. Severity is high (CVSS 7.8). An issue was discovered in Open-iSCSI through 2.0.875. A local attacker can cause the iscsiuio server to abort or potentially execute code by sending messages with incorrect lengths, which (due to lack of checking) can lead to buffer overfl

Routine

HIGH 7.8UPGRADE

CVE-2017-17840 is a high-severity flaw (CVSS 7.8) affecting open-iscsi. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in Open-iSCSI through 2.0.875. A local attacker can cause the iscsiuio server to abort or potentially execute code by sending messages with incorrect lengths, which (due to lack of checking) can lead to buffer overflows, and result in aborts (with overflow checking enabled) or code execution. The process_iscsid_broadcast function in iscsiuio/src/unix/iscsid_ipc.c does not validate the payload length before a write operatio

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 61%)
CISA exploited list	No
Weakness	CWE-119
Published	2017-12-27
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: open-iscsi project

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

Am I affected?

Timeline

2017-12-27 17:08 UTCPublished CVE record published
2026-06-17 01:11 UTCUpdated Record last modified

open-iscsi project open-iscsi UPGRADE

Affected: <= 2.0.875

Fixed in: newer than 2.0.875

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy open-iscsi || rpm -q open-iscsi || open-iscsi --version

2. UPGRADE to newer than 2.0.875 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade open-iscsi

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade open-iscsi

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2017-17840?

open-iscsi: upgrade to newer than 2.0.875. Exact commands for each OS are on this page.

Is CVE-2017-17840 being exploited?

CVE-2017-17840 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-2017-17840 affect?

CVE-2017-17840 affects open-iscsi. Severity is high (CVSS 7.8). An issue was discovered in Open-iSCSI through 2.0.875. A local attacker can cause the iscsiuio server to abort or potentially execute code by sending messages with incorrect lengths, which (due to lack of checking) can lead to buffer overfl

How urgent is CVE-2017-17840?

Priority 37/100. High severity

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CVE-2020-13987 HIGH 7.5 UPGRADE UPGRADE An issue was discovered in Contiki through 3.0

References

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