What is CVE-2016-4051?

CVE-2016-4051 is a high-severity vulnerability in Oracle Linux, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.8/10. Published 2016-04-25.

How severe is CVE-2016-4051?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2016-4051 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Oracle Linux

CVE-2016-4051

Buffer overflow in cachemgr.cgi in Squid 2.x, 3.x before 3.5.17, and 4.x before 4.0.9 might allow remote attackers to cause a denial of service or execute arbitrary code by seeding manager reports with crafted data.

Vulnerability class: Buffer Overflow

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

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.183 (97.1th percentile), scored 2026-09-30.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 97.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.183 · newest: 0.183 · change: 0.000

Affected products

Oracle Linux — versions 6, 7
Squid-Cache Squid — versions 2.0, 2.1, 2.2
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

Public proof-of-concept exploits

AtokTajuddin/BOAR_

References

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)
www.squid-cache.org/Advisories/SQUID-2016_5.txt (Vendor Advisory)
lists.opensuse.org/opensuse-security-announce/2016-08/msg00010.html (vendor-advisory)
www.securitytracker.com/id/1035646 (VDB Entry, Third Party Advisory, vdb-entry)
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)

Frequently asked questions

What is CVE-2016-4051?: CVE-2016-4051 is a high-severity vulnerability in Oracle Linux, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.8/10. Published 2016-04-25.
How severe is CVE-2016-4051?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2016-4051 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.