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CVE-2015-4645

16
FAUCET Score

CVE-2015-4645 describes an integer overflow vulnerability in the read_fragment_table_4 function within Squashfs and sasquatch, leading to a stack-based buffer overflow. This flaw allows remote attackers to cause a denial of service (application crash) via a specially crafted input, impacting Fedora and Squashfs projects. The vulnerability has a CVSS score of 5.5 (Medium), indicating a local attack vector with low complexity, requiring user interaction, and resulting in high availability impact. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 4.3CPE matchmatch criteria
cpe:2.3:a:squashfs_project:squashfs:*:*:*:*:*:*:*:*
21CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:21:*:*:*:*:*:*:*
22CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:22:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.5MEDIUM

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
3.16%
Probability of exploitation in next 30 days
EPSS Percentile
86.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0316 is in the 95th percentile among its peer group of 5,758 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 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 (11)

microsoftpatch availablevia msrc
Product: 16835-16820Fixed in: 4.3-26
microsoftpatch availablevia msrc
Product: 16836-16823Fixed in: 4.5-1
microsoftpatch availablevia msrc
Product: cm1 squashfs-tools 4.3-26 on CBL Mariner 1.0Fixed in: 4.3-26
microsoftpatch availablevia msrc
Product: cbl2 squashfs-tools 4.5-1 on CBL Mariner 2.0Fixed in: 4.5-1
microsoftpatch availablevia msrc
Product: CBL Mariner 1.0 ARMFixed in: 4.3-26
microsoftpatch availablevia msrc
Product: CBL Mariner 2.0 x64Fixed in: 4.5-1
microsoftpatch availablevia msrc
Product: CBL Mariner 2.0 ARMFixed in: 4.5-1
microsoftpatch availablevia msrc
Product: CBL Mariner 1.0 x64Fixed in: 4.3-26
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: squashfs-tools
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: squashfs-tools
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: squashfs-tools

Vendor Advisories (3)

microsoft2021-Jul/CVE-2015-4645

CVE-2015-4645

Jul 13, 2021
microsoft2017-Mar/CVE-2015-4645Moderate

Integer overflow in the read_fragment_table_4 function in unsquash-4.c in Squashfs and sasquatch allows remote attackers to cause a denial of service (application crash) via a crafted input which triggers a stack-based buffer overflow.

Mar 14, 2017
redhatCVE-2015-4645Moderate

squashfs-tools: integer overflow in read_fragment_table_4

Jun 17, 2015

References

lists.fedoraproject.org / pipermail/package-announce/2015-July/162171.html
Third Party Advisory
lists.fedoraproject.org / pipermail/package-announce/2015-July/162226.html
Third Party Advisory
bugzilla.redhat.com / show_bug.cgi
Issue TrackingThird Party AdvisoryVDB Entry
github.com / devttys0/sasquatch/pull/5
Third Party Advisory
github.com / plougher/squashfs-tools/commit/f95864afe8833fe3ad782d714b41378e860977b1
Third Party Advisory
security.gentoo.org / glsa/201701-73
Third Party AdvisoryVDB Entry
securityfocus.com / bid/75272
Third Party AdvisoryVDB Entry