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CVE-2016-5300

30
FAUCET Score

CVE-2016-5300 describes a denial-of-service vulnerability in the Expat XML parser, affecting products from Canonical, Debian, Google, and the libexpat_project. The flaw stems from insufficient entropy in hash initialization, allowing attackers to consume CPU resources via specially crafted XML identifiers. Rated 7.5 HIGH, this vulnerability is network-exploitable with low attack complexity, requiring no user interaction or privileges, and primarily impacts availability. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
12.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:*
14.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
15.10CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:15.10:*:*:*:*:*:*:*
16.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
8.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
6.54%
Probability of exploitation in next 30 days
EPSS Percentile
93.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0654 is in the 88th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (9)

oraclepatch availablevia nvd_reference
View patch
redhatvendor investigatingvia redhat_api
Product: Red Hat Directory Server 8Fixed in: expat
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: expat
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: xmlrpc-c
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: expat
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: expat
redhatend of lifevia redhat_api
Product: Red Hat JBoss Enterprise Application Platform 6Fixed in: expat
redhatend of lifevia redhat_api
Product: Red Hat JBoss Enterprise Web Server 2Fixed in: expat
redhatend of lifevia redhat_api
Product: Red Hat JBoss Enterprise Web Server 3Fixed in: expat

Vendor Advisories (1)

redhatCVE-2016-5300Moderate

expat: Little entropy used for hash initialization

Jun 4, 2016

References

kc.mcafee.com / corporate/index
lists.apache.org / thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
lists.apache.org / thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
security.gentoo.org / glsa/201701-21
Third Party Advisory
source.android.com / security/bulletin/2016-11-01.html
Third Party Advisory
tenable.com / security/tns-2016-20
Third Party Advisory
debian.org / security/2016/dsa-3597
Third Party Advisory
openwall.com / lists/oss-security/2016/06/04/4
Mailing List
openwall.com / lists/oss-security/2016/06/04/5
Mailing List
oracle.com / technetwork/security-advisory/cpujul2018-4258247.html
PatchThird Party Advisory
oracle.com / technetwork/topics/security/bulletinjul2016-3090568.html
Third Party Advisory
securityfocus.com / bid/91159
Third Party AdvisoryVDB Entry
ubuntu.com / usn/USN-3010-1
Third Party Advisory