CVE-2007-3725: The RAR VM (unrarvm.c) in Clam Antivirus (ClamAV) before 0.91 allows user-assisted remote attackers to cause a

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MEDIUM 4.3DOWNGRADE

CVE-2007-3725 is a medium-severity flaw (CVSS 4.3) affecting clamav. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The RAR VM (unrarvm.c) in Clam Antivirus (ClamAV) before 0.91 allows user-assisted remote attackers to cause a denial of service (crash) via a crafted RAR archive, resulting in a NULL pointer dereference.

Why this priority

EPSS top 5%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	7.7% (top 5%)
CISA exploited list	No
Published	2007-07-12
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: clam anti-virus

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

Am I affected?

Timeline

2007-07-12 16:30 UTCPublished CVE record published
2026-06-16 22:42 UTCUpdated Record last modified

clam anti-virus clamav DOWNGRADE

Affected: 0.15 · 0.20 · 0.21 · 0.22 · 0.23 · 0.24 · 0.51 · 0.52

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.15

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.15 (Debian / Ubuntu)

apt-cache madison clamav sudo apt install clamav=<VERSION_BEFORE_0.15> sudo apt-mark hold clamav

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

dnf --showduplicates list clamav sudo dnf downgrade clamav-<VERSION_BEFORE_0.15> sudo dnf versionlock add clamav

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: ClamAV / UnRAR - .RAR Handling Remote Null Pointer Dereference

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-2007-3725?

clamav: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2007-3725 being exploited?

CVE-2007-3725 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-2007-3725 affect?

CVE-2007-3725 affects clamav. Severity is medium (CVSS 4.3). The RAR VM (unrarvm.c) in Clam Antivirus (ClamAV) before 0.91 allows user-assisted remote attackers to cause a denial of service (crash) via a crafted RAR archive, resulting in a NULL pointer dereference.

How urgent is CVE-2007-3725?

Priority 44/100. EPSS top 5%: very likely to be exploited; Public exploit reference

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References

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