CVE-2014-6040

What it is

GNU C Library (aka glibc) before 2.20 allows context-dependent attackers to cause a denial of service (out-of-bounds read and crash) via a multibyte character value of "0xffff" to the iconv function when converting (1) IBM933, (2) IBM935, (3) IBM937, (4) IBM939, or (5) IBM1364 encoded data to UTF-8.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

6.6% chance of exploitation in the next 30 days (EPSS).

Fix

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

Timeline

1. 2014-12-05 16:59 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 00:12 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 6.6% in the next 30 days (EPSS).
• Severity: 5.0 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2014-12-05 16:59 UTC

Last modified

2026-06-17 00:12 UTC

Exploit probability

6.6% · EPSS, next 30 days

Weakness

CWE-119 · Buffer errors

Record status

Modified

Affected

• Gnu Glibc ≤ 2.19
• Gnu Glibc 2.0
• Gnu Glibc 2.0.1
• Gnu Glibc 2.0.2
• Gnu Glibc 2.0.3
• Gnu Glibc 2.0.4
• Gnu Glibc 2.0.5
• Gnu Glibc 2.0.6

Attack profile CVSS 2.0 · 5.0

Attack vector

Network

Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

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.

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