CVE-2026-20244: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in Cisco Cisco Secure Endpoint
A vulnerability in the DMG file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition, or possibly other expanded impacts, resulting from memory corruption on an affected device. This vulnerability is due to improper boundary checks for content in DMG files during scanning, which may result in an integer overflow on 32-bit platforms only. An attacker could exploit this vulnerability by submitting a crafted file that contains DMG content to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected software.
AI Analysis
Technical Summary
This vulnerability arises from improper boundary checks in the DMG file format parser used by ClamAV within Cisco Secure Endpoint. Specifically, an integer overflow on 32-bit platforms can occur when scanning specially crafted DMG files, resulting in memory corruption. Exploitation requires an attacker to submit a malicious DMG file to be scanned, which can cause the ClamAV scanning process to crash, leading to a denial of service condition. The vulnerability has a CVSS 3.1 base score of 7.5, indicating high severity, with network attack vector, low attack complexity, no privileges or user interaction required, and impact limited to availability.
Potential Impact
Successful exploitation causes the ClamAV scanning process within Cisco Secure Endpoint to terminate unexpectedly, resulting in a denial of service condition. There is no confirmed impact on confidentiality or integrity. The vulnerability is limited to 32-bit platforms due to the integer overflow nature. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, consider restricting or monitoring the scanning of untrusted DMG files to reduce exposure. No vendor advisory or official remediation instructions are currently provided.
CVE-2026-20244: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in Cisco Cisco Secure Endpoint
Description
A vulnerability in the DMG file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition, or possibly other expanded impacts, resulting from memory corruption on an affected device. This vulnerability is due to improper boundary checks for content in DMG files during scanning, which may result in an integer overflow on 32-bit platforms only. An attacker could exploit this vulnerability by submitting a crafted file that contains DMG content to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected software.
CVSS v3.1
Score 7.5high
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability arises from improper boundary checks in the DMG file format parser used by ClamAV within Cisco Secure Endpoint. Specifically, an integer overflow on 32-bit platforms can occur when scanning specially crafted DMG files, resulting in memory corruption. Exploitation requires an attacker to submit a malicious DMG file to be scanned, which can cause the ClamAV scanning process to crash, leading to a denial of service condition. The vulnerability has a CVSS 3.1 base score of 7.5, indicating high severity, with network attack vector, low attack complexity, no privileges or user interaction required, and impact limited to availability.
Potential Impact
Successful exploitation causes the ClamAV scanning process within Cisco Secure Endpoint to terminate unexpectedly, resulting in a denial of service condition. There is no confirmed impact on confidentiality or integrity. The vulnerability is limited to 32-bit platforms due to the integer overflow nature. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, consider restricting or monitoring the scanning of untrusted DMG files to reduce exposure. No vendor advisory or official remediation instructions are currently provided.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- cisco
- Date Reserved
- 2025-10-08T11:59:15.400Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a45492827e9c79719d6205a
Added to database: 07/01/2026, 17:06:48 UTC
Last enriched: 07/11/2026, 09:40:59 UTC
Last updated: 08/16/2026, 00:41:11 UTC
Views: 55
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