How severe is CVE-2017-17840?

CVE-2017-17840 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-17840 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-17840?

CVE-2017-17840 affects Open-iscsi Project Open-iscsi. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-17840?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2017-17840 published?

CVE-2017-17840 was published on 2017-12-27 and last updated on 2026-06-17.

CVE-2017-17840

CVE-2017-17840 is a high-severity vulnerability in Open-iscsi Project Open-iscsi with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-119.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 4.6
EPSS exploit prediction: 0% (36th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Open-iscsi Project Open-iscsi
Published: 2017-12-27
Last modified: 2026-06-17

Description

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 operation.

Frequently asked questions

What is CVE-2017-17840?: 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 operation.
How severe is CVE-2017-17840?: CVE-2017-17840 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-17840 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-17840?: CVE-2017-17840 affects Open-iscsi Project Open-iscsi. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-17840?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2017-17840 published?: CVE-2017-17840 was published on 2017-12-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:open-iscsi_project:open-iscsi:*:*:*:*:*:*:*:*

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