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CVE-2025-20234: A vulnerability in Universal Disk Format (UDF) processing of ClamAV could allow an unauthenticated, remote att

38
Routine
MEDIUM 5.3REMOTEUPGRADEUPGRADEUPGRADE

CVE-2025-20234 is a medium-severity flaw (CVSS 5.3) affecting clamav, secure endpoint, secure endpoint. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability in Universal Disk Format (UDF) processing of ClamAV could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to a memory overread during UDF file scanning. An attacker could exploit this vulnerability by submitting a crafted file containing UDF content to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker

Why this priority

  • Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score5.3 (Medium)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.8% (top 43%)
CISA exploited listNo
WeaknessCWE-125
Published2025-06-18
Last modified2026-06-17
Publisher (CNA): Cisco Systems, Inc. · Vendor: cisco · clamav

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

Am I affected?

Timeline

clamav clamav UPGRADE
Affected: >= 1.2.0 and < 1.4.3
Fixed in: 1.4.3
Safe to downgrade to: a release before 1.2.0
1. Check installed version
apt-cache policy clamav || rpm -q clamav || clamav --version
2. UPGRADE to 1.4.3 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade clamav
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade clamav
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 1.2.0 (Debian / Ubuntu)
apt-cache madison clamav sudo apt install clamav=<VERSION_BEFORE_1.2.0> sudo apt-mark hold clamav
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list clamav sudo dnf downgrade clamav-<VERSION_BEFORE_1.2.0> 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.
cisco secure endpoint UPGRADE
Affected: < 1.26.1
Fixed in: 1.26.1
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy secure-endpoint || rpm -q secure-endpoint || secure-endpoint --version
2. UPGRADE to 1.26.1 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade secure-endpoint
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade secure-endpoint
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
cisco secure endpoint UPGRADE
Affected: < 1.26.1
Fixed in: 1.26.1
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy secure-endpoint || rpm -q secure-endpoint || secure-endpoint --version
2. UPGRADE to 1.26.1 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade secure-endpoint
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade secure-endpoint
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
cisco secure endpoint UPGRADE
Affected: < 7.5.21 · >= 8.0.1.21160 and < 8.4.5
Fixed in: 7.5.21, 8.4.5
Safe to downgrade to: a release before 8.0.1.21160
1. Check installed version
apt-cache policy secure-endpoint || rpm -q secure-endpoint || secure-endpoint --version
2. UPGRADE to 7.5.21 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade secure-endpoint
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade secure-endpoint
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 8.0.1.21160 (Debian / Ubuntu)
apt-cache madison secure-endpoint sudo apt install secure-endpoint=<VERSION_BEFORE_8.0.1.21160> sudo apt-mark hold secure-endpoint
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list secure-endpoint sudo dnf downgrade secure-endpoint-<VERSION_BEFORE_8.0.1.21160> sudo dnf versionlock add secure-endpoint
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.
cisco secure endpoint private cloud UPGRADE
Affected: < 4.2.2
Fixed in: 4.2.2
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy secure-endpoint-private-cloud || rpm -q secure-endpoint-private-cloud || secure-endpoint-private-cloud --version
2. UPGRADE to 4.2.2 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade secure-endpoint-private-cloud
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade secure-endpoint-private-cloud
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
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-2025-20234?

clamav: upgrade to 1.4.3; secure endpoint: upgrade to 1.26.1; secure endpoint: upgrade to 1.26.1. Exact commands for each OS are on this page.

Is CVE-2025-20234 being exploited?

CVE-2025-20234 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-2025-20234 affect?

CVE-2025-20234 affects clamav, secure endpoint, secure endpoint. Severity is medium (CVSS 5.3). A vulnerability in Universal Disk Format (UDF) processing of ClamAV could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to a memory overread during

How urgent is CVE-2025-20234?

Priority 38/100. Remotely exploitable, no login, no user action

Software pages

Cisco vulnerabilities

Related CVEs

References

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