CVE-2015-4645: Integer overflow in the read_fragment_table_4 function in unsquash-4.c in Squashfs and sasquatch allows remote

Q: How do I fix CVE-2015-4645?

squashfs: upgrade to newer than 4.3; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2015-4645 being exploited?

CVE-2015-4645 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2015-4645 affect?

CVE-2015-4645 affects squashfs, fedora. Severity is medium (CVSS 5.5). 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.

Q: How urgent is CVE-2015-4645?

Priority 41/100. No elevated risk signals yet.

This month

MEDIUM 5.5UPGRADEMITIGATE

CVE-2015-4645 is a medium-severity flaw (CVSS 5.5) affecting squashfs, fedora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	3.2% (top 12%)
CISA exploited list	No
Weakness	CWE-190
Published	2017-03-17
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: fedoraproject · squashfs project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2017-03-17 14:59 UTCPublished CVE record published
2026-06-17 00:27 UTCUpdated Record last modified

squashfs project squashfs UPGRADE

Affected: <= 4.3

Fixed in: newer than 4.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy squashfs || rpm -q squashfs || squashfs --version

2. UPGRADE to newer than 4.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade squashfs

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade squashfs

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

fedoraproject fedora MITIGATE

Affected: 21 · 22

Fixed in: no fixed release known

Safe to downgrade to: a release before 21

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2015-4645?

squashfs: upgrade to newer than 4.3; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2015-4645 being exploited?

CVE-2015-4645 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2015-4645 affect?

CVE-2015-4645 affects squashfs, fedora. Severity is medium (CVSS 5.5). 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.

How urgent is CVE-2015-4645?

Priority 41/100. No elevated risk signals yet.

Related CVEs

CVE-2015-4646 HIGH 7.5 UPGRADE (1) unsquash-1.c, (2) unsquash-2.c, (3) unsquash-3.c, and (4) unsquash-4.c in Squashfs and sasquatch allow rem
CVE-2012-4025 MEDIUM 6.8 UPGRADE Integer overflow in the queue_init function in unsquashfs.c in unsquashfs in Squashfs 4.2 and earlier allows r
CVE-2012-4024 MEDIUM 6.8 UPGRADE Stack-based buffer overflow in the get_component function in unsquashfs.c in unsquashfs in Squashfs 4.2 and ea

References

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