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CVE-2015-5229

22
FAUCET Score

CVE-2015-5229 describes a memory initialization flaw in the glibc calloc function affecting Red Hat Enterprise Linux 6.7 and 7.2. This vulnerability could allow unauthenticated attackers to trigger a denial of service (system hang or crash) due to improperly initialized memory areas. With a CVSS score of 7.5 (High), it presents a low-complexity network attack vector with a high impact on availability. While there is no known active exploitation, public exploit code, or KEV listing, the vulnerability has garnered some community discussion, indicating awareness.

Impacted Technologies

VendorProductVersion(s)CPE
6.7CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux:6.7:*:*:*:*:*:*:*
7.2CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux:7.2:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux_hpc_node:7.0:*:*:*:*:*:*:*
7.2CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux_hpc_node_eus:7.2:*:*:*:*:*:*:*

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
2.24%
Probability of exploitation in next 30 days
EPSS Percentile
81.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0224 is in the 66th percentile among its peer group of 51,506 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 (3)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: glibc-0:2.12-1.166.el6_7.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: glibc-0:2.17-106.el7_2.4
View patch
redhatvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2015-5229Low

glibc: calloc may return non-zero memory

Aug 21, 2015

References

rhn.redhat.com / errata/RHSA-2016-0176.html
Vendor Advisory
bugzilla.redhat.com / show_bug.cgi
Vendor Advisory
bugzilla.redhat.com / show_bug.cgi
Vendor Advisory
bugzilla.redhat.com / show_bug.cgi
Vendor Advisory
kc.mcafee.com / corporate/index
oracle.com / technetwork/topics/security/linuxbulletinjan2016-2867209.html
securityfocus.com / bid/84172