CVE-2007-4787: The virus detection engine in Sophos Anti-Virus before 2.49.0 does not properly process malformed (1) CAB, (2)

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MEDIUM 5.0DOWNGRADEDOWNGRADE

CVE-2007-4787 is a medium-severity flaw (CVSS 5.0) affecting scanning engine, sophos anti-virus. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The virus detection engine in Sophos Anti-Virus before 2.49.0 does not properly process malformed (1) CAB, (2) LZH, and (3) RAR files with modified headers, which might allow remote attackers to bypass malware detection.

Why this priority

EPSS top 7%: very likely to be exploited

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	5.7% (top 7%)
CISA exploited list	No
Weakness	CWE-20
Published	2007-09-10
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

2007-09-10 21:17 UTCPublished CVE record published
2026-06-16 22:44 UTCUpdated Record last modified

sophos scanning engine DOWNGRADE

Affected: 2.30.4

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 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 sophos-anti-virus || rpm -q sophos-anti-virus || sophos-anti-virus --version

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

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

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

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

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-2007-4787?

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

Is CVE-2007-4787 being exploited?

CVE-2007-4787 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-2007-4787 affect?

CVE-2007-4787 affects scanning engine, sophos anti-virus. Severity is medium (CVSS 5.0). The virus detection engine in Sophos Anti-Virus before 2.49.0 does not properly process malformed (1) CAB, (2) LZH, and (3) RAR files with modified headers, which might allow remote attackers to bypass malware detection.

How urgent is CVE-2007-4787?

Priority 41/100. EPSS top 7%: very likely to be exploited

Software pages

Sophos vulnerabilities

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References

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