CVE-2007-4577: Sophos Anti-Virus for Unix/Linux before 2.48.0 allows remote attackers to cause a denial of service (infinite

This month

HIGH 7.8WATCHLISTDOWNGRADEDOWNGRADEDOWNGRADE

CVE-2007-4577 is a high-severity flaw (CVSS 7.8) affecting anti-virus, scanning engine, small business suite. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Sophos Anti-Virus for Unix/Linux before 2.48.0 allows remote attackers to cause a denial of service (infinite loop) via a malformed BZip file that results in the creation of multiple Engine temporary files (aka a "BZip bomb").

Why this priority

High severity
EPSS top 7%: very likely to be exploited
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.8 (High)
EPSS exploit chance	5.5% (top 7%)
CISA exploited list	No
Weakness	CWE-399
Published	2007-08-28
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: sophos

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2007-08-28 18:17 UTCPublished CVE record published
2026-06-16 22:44 UTCUpdated Record last modified

sophos anti-virus DOWNGRADE

Affected: 3.4.6 · 3.78 · 3.78d · 3.79 · 3.80 · 3.81 · 3.82 · 3.83

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.4.6

1. Check installed version

apt-cache policy anti-virus || rpm -q anti-virus || anti-virus --version

2. No fixed release: DOWNGRADE to a release before 3.4.6 (Debian / Ubuntu)

apt-cache madison anti-virus sudo apt install anti-virus=<VERSION_BEFORE_3.4.6> sudo apt-mark hold anti-virus

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list anti-virus sudo dnf downgrade anti-virus-<VERSION_BEFORE_3.4.6> sudo dnf versionlock add anti-virus

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

sophos scanning engine DOWNGRADE

Affected: 2.30.4 · 2.40.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.30.4

1. Check installed version

apt-cache policy scanning-engine || rpm -q scanning-engine || scanning-engine --version

2. No fixed release: DOWNGRADE to a release before 2.30.4 (Debian / Ubuntu)

apt-cache madison scanning-engine sudo apt install scanning-engine=<VERSION_BEFORE_2.30.4> sudo apt-mark hold scanning-engine

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list scanning-engine sudo dnf downgrade scanning-engine-<VERSION_BEFORE_2.30.4> sudo dnf versionlock add scanning-engine

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

sophos small business suite DOWNGRADE

Affected: 4.04 · 4.05

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.04

1. Check installed version

apt-cache policy small-business-suite || rpm -q small-business-suite || small-business-suite --version

2. No fixed release: DOWNGRADE to a release before 4.04 (Debian / Ubuntu)

apt-cache madison small-business-suite sudo apt install small-business-suite=<VERSION_BEFORE_4.04> sudo apt-mark hold small-business-suite

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list small-business-suite sudo dnf downgrade small-business-suite-<VERSION_BEFORE_4.04> sudo dnf versionlock add small-business-suite

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2007-4577?

anti-virus: downgrade or apply the listed mitigation; scanning engine: downgrade or apply the listed mitigation; small business suite: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2007-4577 being exploited?

CVE-2007-4577 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-2007-4577 affect?

CVE-2007-4577 affects anti-virus, scanning engine, small business suite. Severity is high (CVSS 7.8). Sophos Anti-Virus for Unix/Linux before 2.48.0 allows remote attackers to cause a denial of service (infinite loop) via a malformed BZip file that results in the creation of multiple Engine temporary files (aka a "BZip bomb").

How urgent is CVE-2007-4577?

Priority 56/100. High severity; EPSS top 7%: very likely to be exploited; On your watchlist

Software pages

Sophos vulnerabilities

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References

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