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.

Published: 2017-12-27 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-17840 is rated Moderate Risk (43.8/100): CVSS High severity, with low exploitation likelihood (EPSS 0.45%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2017-17840

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.15% 0.45% +0.29%
2 2025-06-19 0.03% 0.15% +0.12%
3 2025-03-30 — 0.03% —

Full EPSS history (8 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-17840

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.8 3.0 HIGH
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.9 [email protected]
4.6 2.0 MEDIUM
AV:L/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 3.9 6.4 [email protected]

Weakness enumeration for CVE-2017-17840

OS Trackers for CVE-2017-17840

vendor priority summary link
debian not yet assigned CVE-2017-17840 not yet assigned priority: Debian including 1 source packages (open-iscsi), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2017-17840
redhat medium — https://access.redhat.com/security/cve/CVE-2017-17840
suse high CVE-2017-17840 severity important: SUSE including 6 source package names (iscsiuio, libopeniscsiusr0_1_0, libopeniscsiusr0_2_0, open-iscsi, open-iscsi-2.0.873-0.41.4.1, open-iscsi-devel), 72 product×package rows across 29 product lines (SUSE CaaS Platform 4.0, SUSE CaaS Platform 4.5, … (29 product lines)): Known Not Affected 71, Fixed 1. https://www.suse.com/security/cve/CVE-2017-17840/
ubuntu medium CVE-2017-17840 medium priority: Ubuntu including 1 source packages (open-iscsi), 7 status rows across 7 suites (artful, bionic, cosmic, trusty, upstream, xenial, zesty): not-affected 5, ignored 1, released 1. https://ubuntu.com/security/CVE-2017-17840

Affected software / configurations for CVE-2017-17840

Vendor Product Version Raw CPE
open-iscsi_project open-iscsi <= 2.0.875 cpe:2.3:a:open-iscsi_project:open-iscsi:*:*:*:*:*:*:*:*

References for CVE-2017-17840

URL Tags
http://www.openwall.com/lists/oss-security/2017/12/13/2 Mailing List Third Party Advisory
https://bugzilla.opensuse.org/show_bug.cgi?id=1072312 Issue Tracking Third Party Advisory
cvelogic Threat Intelligence