No exploitation reportedFix available

CVE-2016-4472

Q: Is CVE-2016-4472 actively exploited?

Active exploitation of CVE-2016-4472 has not been confirmed. Its EPSS score was 11.9% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2016-4472?

CVE-2016-4472 has a CVSS v3 base score of 8.1 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2016-06-30
Fixed in3.6.2 · 3.5.4 · 3.4.7 · 3.3.7 · 2.7.15
WeaknessCWE-119

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

The overflow protection in Expat is removed by compilers with certain optimization settings, which allows remote attackers to cause a denial of service (crash) or possibly execute arbitrary code via crafted XML data. NOTE: this vulnerability exists because of an incomplete fix for CVE-2015-1283 and CVE-2015-2716.

Timeline

dates in UTC

2016-06-3017:59CVE publishedNVD
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2016-4472?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2016-4472?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Python

Branch	Affected	Fixed in	Source
3.6	≥ 3.6.0, < 3.6.2	3.6.2	NVD
3.5	≥ 3.5.0, < 3.5.4	3.5.4	NVD
3.4	≥ 3.4.0, < 3.4.7	3.4.7	NVD
3.3	≥ 3.3.0, < 3.3.7	3.3.7	NVD
2.7	≥ 2.7.0, < 2.7.15	2.7.15	NVD

Canonical ubuntu linux

Branch	Affected	Fixed in	Source
12.4	= 12.04	no fix published	NVD

Libexpat project libexpat

Branch	Affected	Fixed in	Source
2.1	≤ 2.1.1	no fix published	NVD

1 more product in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Python to 3.6.2 · 3.5.4 · 3.4.7 · 3.3.7 · 2.7.15

Advisories and patches

bugzilla.redhat.comPatch
sourceforge.netPatch

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2026-10-08
OpenCVESSVC decisionnone—
NVDCVSS 3.18.1read 2026-10-23
NVDCVSS 2.06.8read 2026-10-23
NVDweakness (CWE)CWE-119read 2026-10-23
FIRST EPSSEPSS score11.9 %read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2016-06-30
Last Modified: 2026-10-08
NVD status: Modified

Frequently asked questions

What is CVE-2016-4472?

Is CVE-2016-4472 actively exploited?

Active exploitation of CVE-2016-4472 has not been confirmed. Its EPSS score was 11.9% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2016-4472?

CVE-2016-4472 has a CVSS v3 base score of 8.1 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

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