What is CVE-2016-4053?

CVE-2016-4053 is a low-severity vulnerability in Oracle Linux, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 3.7/10. Published 2016-04-25.

How severe is CVE-2016-4053?

Low severity. CVSS v3 base score is 3.7 out of 10.

Buffer overflow in Oracle Linux

CVE-2016-4053

Squid 3.x before 3.5.17 and 4.x before 4.0.9 allow remote attackers to obtain sensitive stack layout information via crafted Edge Side Includes (ESI) responses, related to incorrect use of assert and compiler optimization.

Vulnerability class: Buffer Overflow

Published 2016-04-25 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 3.7 (Low). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.144 (96.5th percentile), scored 2026-09-30.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 96.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.144 · newest: 0.144 · change: 0.000

Affected products

Oracle Linux — versions 6, 7
Squid-Cache Squid — versions 3.0, 3.1, 3.1.0.1
Canonical Ubuntu Linux — versions 12.04, 14.04, 15.10

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

References

www.squid-cache.org/Advisories/SQUID-2016_6.txt (Vendor Advisory)
security.gentoo.org/glsa/201607-01 (vendor-advisory)
www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html (Third Party Advisory)
www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html (Patch, Third Party Advisory)
lists.opensuse.org/opensuse-security-announce/2016-08/msg00010.html (vendor-advisory)
www.openwall.com/lists/oss-security/2016/04/20/6 (mailing-list, Mailing List, Third Party Advisory)
www.ubuntu.com/usn/USN-2995-1 (vendor-advisory, Third Party Advisory)
access.redhat.com/errata/RHSA-2016:1140 (vendor-advisory)
lists.opensuse.org/opensuse-updates/2016-08/msg00069.html (vendor-advisory)
access.redhat.com/errata/RHSA-2016:1138 (vendor-advisory)

Frequently asked questions

What is CVE-2016-4053?: CVE-2016-4053 is a low-severity vulnerability in Oracle Linux, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 3.7/10. Published 2016-04-25.
How severe is CVE-2016-4053?: Low severity. CVSS v3 base score is 3.7 out of 10.