What is CVE-2012-6123?

CVE-2012-6123 is a medium-severity vulnerability in Call-Cc Chicken, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2019-10-31.

How severe is CVE-2012-6123?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Improper input validation in Call-Cc Chicken

CVE-2012-6123

Chicken before 4.8.0 does not properly handle NUL bytes in certain strings, which allows an attacker to conduct "poisoned NUL byte attack."

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2019-10-31 · last modified 2026-06-16.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.013 (68.6th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 68.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Call-Cc Chicken
Chicken — versions before 4.8.0
Debian Linux — versions 8.0, 9.0, 10.0

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

security-tracker.debian.org/tracker/CVE-2012-6123 (Third Party Advisory)
access.redhat.com/security/cve/cve-2012-6123 (Broken Link)
www.openwall.com/lists/oss-security/2013/02/08/2 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2012-6123?: CVE-2012-6123 is a medium-severity vulnerability in Call-Cc Chicken, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2019-10-31.
How severe is CVE-2012-6123?: Medium severity. CVSS v3 base score is 6.5 out of 10.