CVE-2015-4646

(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.

Published: 2017-04-13 Last update: 2026-05-13 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2015-4646 is rated Moderate Risk (56.9/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.05%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2015-4646

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-08-20 0.93% 1.05% +0.11%
2 2025-03-30 10.79% 0.93% -9.85%
3 2025-03-29 — 10.79% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2015-4646

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2015-4646

OS Trackers for CVE-2015-4646

vendor priority summary link
debian not yet assigned CVE-2015-4646 not yet assigned priority: Debian including 1 source packages (squashfs-tools), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2015-4646
gentoo normal CVE-2015-4646: 1 GLSA(s) (201701-73), 1 atom(s) (sys-fs/squashfs-tools); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2015-4646
redhat medium — https://access.redhat.com/security/cve/CVE-2015-4646
suse medium CVE-2015-4646 severity moderate: SUSE including 10 source package names (2.0.4-5.8.118:squashfs-4.6.1-150300.3.3.1, 9.24.43-10.1:squashfs-4.6.1-150300.3.3.1, …), 40 product×package rows across 39 product lines (Container bci/kiwi, Container suse/sle-micro-rancher/5.2, … (39 product lines)): Fixed 37, Known Not Affected 3. https://www.suse.com/security/cve/CVE-2015-4646/
ubuntu low CVE-2015-4646 low priority: Ubuntu including 1 source packages (squashfs-tools), 13 status rows across 13 suites (artful, bionic, cosmic, disco, precise, trusty, upstream, utopic, vivid, wily, xenial, yakkety, zesty): ignored 7, not-affected 4, DNE 1, released 1. https://ubuntu.com/security/CVE-2015-4646

Affected software / configurations for CVE-2015-4646

Vendor Product Version Raw CPE
squashfs_project squashfs <= 4.3 cpe:2.3:a:squashfs_project:squashfs:*:*:*:*:*:*:*:*

References for CVE-2015-4646

cvelogic Threat Intelligence