CVE-2026-20216

CVE-2026-20216 is a high-severity vulnerability in Cisco Secure Endpoint with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-770.

Key facts

• Severity: High (CVSS 3.x base score 7.5)
• EPSS exploit prediction: 1% (46th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-770
• Affected product: Cisco Secure Endpoint
• Published: 2026-07-01
• Last modified: 2026-07-09

Description

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 the ClamAV scanning process and temporarily consume available system resources, resulting in a DoS condition on the affected software.

Frequently asked questions

What is CVE-2026-20216?

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 the ClamAV scanning process and temporarily consume available system resources, resulting in a DoS condition on the affected software.

How severe is CVE-2026-20216?

CVE-2026-20216 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-20216 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-20216?

CVE-2026-20216 primarily affects Cisco Secure Endpoint. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-20216?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2026-20216 published?

CVE-2026-20216 was published on 2026-07-01 and last updated on 2026-07-09.

References

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-88cFYyxR

Affected products (4)

• cpe:2.3:a:cisco:secure_endpoint:*:*:*:*:*:macos:*:*
• cpe:2.3:a:cisco:secure_endpoint:*:*:*:*:*:linux:*:*
• cpe:2.3:a:cisco:secure_endpoint:*:*:*:*:*:windows:*:*
• cpe:2.3:a:clamav:clamav:*:*:*:*:*:*:*:*

More vulnerabilities in Cisco Secure Endpoint

• CVE-2023-20032 — Critical (CVSS 9.8): On Feb 15, 2023, the following vulnerability in the ClamAV scanning library was disclosed: A vulnerability in the…
• CVE-2022-20770 — High (CVSS 8.6): On April 20, 2022, the following vulnerability in the ClamAV scanning library versions 0.103.5 and earlier and 0.104.2…
• CVE-2026-20348 — High (CVSS 7.5): A vulnerability in the XAR file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS…
• CVE-2026-20244 — High (CVSS 7.5): A vulnerability in the DMG file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS…
• CVE-2026-20243 — High (CVSS 7.5): A vulnerability in the ALZ file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS…
• CVE-2026-20217 — High (CVSS 7.5): A vulnerability in the PESpin file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a…

All CVEs affecting Cisco Secure Endpoint →

Other CWE-770 (Allocation of Resources Without Limits or Throttling) vulnerabilities

• CVE-2026-63299 — Critical (CVSS 9.9): An authorization bypass vulnerability in LXD allows an authenticated user to bypass project-level disk and volume…
• CVE-2026-82439 — Critical (CVSS 9.8): Description The DRPC server kept a map from function name to request queue and created an entry the first time…
• CVE-2026-47891 — Critical (CVSS 9.8): A Spring WebFlux application that relies on the Aalto XML processor to parse XML input does not correctly enforce the…
• CVE-2026-74878 — Critical (CVSS 9.8): openssl_encrypt versions before 1.4.0 use an in-memory rate limiter for TOTP brute-force protection that is not shared…
• CVE-2026-31283 — Critical (CVSS 9.8): In Totara LMS v19.1.5 and before, the forgot password API does not implement rate limiting for the target email…
• CVE-2020-37067 — Critical (CVSS 9.8): Filetto 1.0 FTP server contains a denial of service vulnerability in the FEAT command processing that allows attackers…

Browse all CWE-770 (Allocation of Resources Without Limits or Throttling) vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE:

• 45.76.188.22 (ipv4-addr)
• 41.78.27.213 (ipv4-addr)
• 176.9.105.121 (ipv4-addr)
• 212.51.58.50 (ipv4-addr)