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CVE-2026-20216: A vulnerability in the InstallShield file format parser of ClamAV could allow an unauthenticated, remote attac

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HIGH 7.5REMOTEUPGRADEUPGRADEUPGRADE

CVE-2026-20216 is a high-severity flaw (CVSS 7.5) affecting secure endpoint, 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 the InstallShield file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to improper handling of temporary resources during file scanning. An attacker could exploit this vulnerability by submitting a crafted InstallShield file to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to terminate

Why this priority

  • High severity
  • Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score7.5 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.6% (top 53%)
CISA exploited listNo
WeaknessCWE-770
Published2026-07-01
Last modified2026-10-25
Publisher (CNA): Cisco Systems, Inc. · Vendor: cisco · clamav

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Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

cisco secure endpoint UPGRADE
Affected: < 1.27.2
Fixed in: 1.27.2
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 1.27.2 (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: < 1.29.0
Fixed in: 1.29.0
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 1.29.0 (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: < 8.6.2
Fixed in: 8.6.2
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 8.6.2 (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.
clamav clamav UPGRADE
Affected: < 1.4.5 · >= 1.5.0 and < 1.5.3
Fixed in: 1.4.5, 1.5.3
Safe to downgrade to: a release before 1.5.0
1. Check installed version
apt-cache policy clamav || rpm -q clamav || clamav --version
2. UPGRADE to 1.4.5 (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 1.5.0 (Debian / Ubuntu)
apt-cache madison clamav sudo apt install clamav=<VERSION_BEFORE_1.5.0> 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_1.5.0> 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.
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-2026-20216?

secure endpoint: upgrade to 1.27.2; secure endpoint: upgrade to 1.29.0; secure endpoint: upgrade to 8.6.2. Exact commands for each OS are on this page.

Is CVE-2026-20216 being exploited?

CVE-2026-20216 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-2026-20216 affect?

CVE-2026-20216 affects secure endpoint, secure endpoint, secure endpoint. Severity is high (CVSS 7.5). A vulnerability in the InstallShield file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to improper handling of temporary resources durin

How urgent is CVE-2026-20216?

Priority 43/100. High severity; Remotely exploitable, no login, no user action

Software pages

Cisco vulnerabilities

Related CVEs

References

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