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CVE-2015-8869

30
FAUCET Score

CVE-2015-8869 describes a critical vulnerability in OCaml versions prior to 4.03.0, stemming from improper handling of sign extensions. This flaw allows remote attackers to trigger buffer overflows or leak sensitive information, notably demonstrated through the String.copy function, impacting various Fedora and openSUSE distributions of OCaml. With a CVSS score of 9.1 (CRITICAL), the vulnerability is easily exploitable over the network with low attack complexity, potentially leading to complete confidentiality and availability compromise. While there is no evidence of active exploitation, nor publicly available exploit code in Metasploit or ExploitDB, the vulnerability has garnered significant community discussion, indicating awareness among security researchers.

Impacted Technologies

VendorProductVersion(s)CPE
24CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:24:*:*:*:*:*:*:*
13.2CPE matchmatch criteria
cpe:2.3:o:opensuse:opensuse:13.2:*:*:*:*:*:*:*
<= 4.02.3CPE matchmatch criteria
cpe:2.3:a:ocaml:ocaml:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.1CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.2
CvssVersion
3.0

Exploit Intelligence

EPSS Score
5.27%
Probability of exploitation in next 30 days
EPSS Percentile
91.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0527 is in the 86th percentile among its peer group of 36,829 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (5)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: libguestfs-1:1.20.11-20.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: ocaml-0:3.11.2-5.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: ocaml-0:4.01.0-22.7.el7_2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: libguestfs-1:1.32.7-3.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: virt-p2v-0:1.32.7-2.el7
View patch

Vendor Advisories (1)

redhatCVE-2015-8869Moderate

ocaml: sizes arguments are sign-extended from 32 to 64 bits

Apr 28, 2016

References

lists.fedoraproject.org / pipermail/package-announce/2016-May/184507.html
lists.opensuse.org / opensuse-updates/2016-05/msg00081.html
lists.opensuse.org / opensuse-updates/2016-09/msg00037.html
rhn.redhat.com / errata/RHSA-2016-2576.html
rhn.redhat.com / errata/RHSA-2017-0564.html
rhn.redhat.com / errata/RHSA-2017-0565.html
access.redhat.com / errata/RHSA-2016:1296
github.com / ocaml/ocaml/commit/659615c7b100a89eafe6253e7a5b9d84d0e8df74
security.gentoo.org / glsa/201702-15
openwall.com / lists/oss-security/2016/04/29/1
openwall.com / lists/oss-security/2016/04/29/6
oracle.com / technetwork/topics/security/linuxbulletinjul2016-3090544.html
securityfocus.com / bid/89318