CVE-2018-14633

What it is

A security flaw was found in the chap_server_compute_md5() function in the ISCSI target code in the Linux kernel in a way an authentication request from an ISCSI initiator is processed. An unauthenticated remote attacker can cause a stack buffer overflow and smash up to 17 bytes of the stack. The attack requires the iSCSI target to be enabled on the victim host. Depending on how the target's code was built (i.e. depending on a compiler, compile flags and hardware architecture) an attack may lead to a system crash and thus to a denial-of-service or possibly to a non-authorized access to data exported by an iSCSI target. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is highly unlikely. Kernel versions 4.18.x, 4.14.x and 3.10.x are believed to be vulnerable.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

8.7% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2018-09-25 00:29 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 01:41 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 8.7% in the next 30 days (EPSS).
• Severity: 7.0 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2018-09-25 00:29 UTC

Last modified

2026-06-17 01:41 UTC

Exploit probability

8.7% · EPSS, next 30 days

Weakness

CWE-121

Record status

Modified

Affected

• Linux Kernel < 3.16.59
• Linux Kernel < 3.18.124
• Linux Kernel < 4.4.159
• Linux Kernel < 4.9.130
• Linux Kernel < 4.14.73
• Linux Kernel < 4.18.11
• Canonical Ubuntu Linux 12.04
• Canonical Ubuntu Linux 14.04

Attack profile CVSS 3.1 · 7.0

Attack vector

Network

Complexity

High

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2018-14633.md and follow it. Check whether this project is affected by CVE-2018-14633. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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