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CVE-2015-4646

22
FAUCET Score

CVE-2015-4646 describes a denial-of-service vulnerability affecting Squashfs and sasquatch, specifically within the unsquash-1.c through unsquash-4.c components. This vulnerability allows remote attackers to crash the application by providing crafted input. Rated with a CVSS score of 7.5 (High), it can be exploited over the network with low attack complexity, leading to 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:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/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
3.1

Exploit Intelligence

EPSS Score
6.91%
Probability of exploitation in next 30 days
EPSS Percentile
93.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0691 is in the 89th percentile among its peer group of 51,485 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, 0.1 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 (11)

microsoftpatch availablevia msrc
Product: 16837-16820Fixed in: 4.4-1
microsoftpatch availablevia msrc
Product: 16836-16823Fixed in: 4.5-1
microsoftpatch availablevia msrc
Product: cm1 squashfs-tools 4.4-1 on CBL Mariner 1.0Fixed in: 4.4-1
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 2.0 ARMFixed in: 4.5-1
microsoftpatch availablevia msrc
Product: CBL Mariner 1.0 x64Fixed in: 4.4-1
microsoftpatch availablevia msrc
Product: CBL Mariner 1.0 ARMFixed in: 4.4-1
microsoftpatch availablevia msrc
Product: CBL Mariner 2.0 x64Fixed in: 4.5-1
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-2015-4646

CVE-2015-4646

Jul 13, 2021
microsoft2017-Apr/CVE-2015-4646Important

(1) unsquash-1.c (2) unsquash-2.c (3) unsquash-3.c and (4) unsquash-4.c in Squashfs and sasquatch allow remote attackers to cause a denial of service (application crash) via a crafted input.

Apr 11, 2017
redhatCVE-2015-4646Moderate

squashfs-tools: stack overflow in read_fragment_table_4 due to fix for CVE-2015-4645

Jun 17, 2015

References

seclists.org / oss-sec/2015/q2/756
Mailing ListThird Party AdvisoryVDB Entry
github.com / plougher/squashfs-tools/commit/f95864afe8833fe3ad782d714b41378e860977b1
Third Party Advisory
security.gentoo.org / glsa/201701-73
Third Party Advisory
securityfocus.com / bid/75272
Third Party AdvisoryVDB Entry