Answer in brief
CVE-2026-20243 records a High severity (CVSS 7.5) vulnerability in ClamAV ALZ Archive Processing Denial of Service Vulnerability. The current sources do not mark it as known exploited. The current feed maps Cisco/Cisco Secure Endpoint (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Cisco/Cisco Secure Endpoint (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Cisco/Cisco Secure Endpointgeneric | 7.0.5 || 6.2.19 || 7.3.3 || 7.2.13 || 6.1.5 || 6.3.1 || 6.2.5 || 7.3.5 || 6.2.1 || 7.2.7 || 7.1.1 || 6.3.5 || 6.2.9 || 7.3.1 || 6.1.7 || 7.2.11 || 7.2.3 || 7.1.5 || 6.3.3 || 7.3.9 || 6.2.3 || 6.1.9 || 6.0.9 || 7.2.5 || 6.0.7 || 6.3.7 || 1.12.3 || 1.8.0 || 1.11.1 || 1.12.4 || 1.10.0 || 1.12.0 || 1.8.1 || 1.10.1 || 1.12.1 || 1.12.6 || 1.14.0 || 1.10.2 || 1.12.7 || 1.12.2 || 1.6.0 || 1.9.0 || 1.11.0 || 1.7.0 || 1.13.0 || 1.8.4 || 1.13.1 || 1.9.1 || 1.12.5 || 1.13.2 || 8.1.7.21512 || 8.1.7 || 8.1.5 || 8.1.3.21242 || 8.1.3 || 8.1.5.21322 || 8.1.7.21417 || 1.14.1 || 1.15.1 || 1.15.2 || 1.15.3 || 1.15.4 || 1.15.5 || 1.15.6 || 1.16.0 || 1.16.1 || 1.16.2 || 1.16.3 || 1.18.0 || 1.18.1 || 1.20.0 || 1.21.0 || 1.21.1 || 1.21.2 || 1.21.3 || 1.22.0 || 1.22.1 || 1.22.2 || 1.22.3 || 1.22.4 || 1.24.0 || 1.24.1 || 1.24.2 || 1.24.3 || 1.24.4 || 1.26.0 || 1.24.5 || 1.26.1 || 1.27.0 || 1.15.0 || 1.17.0 || 1.17.1 || 1.17.2 || 1.19.0 || 1.20.1 || 1.20.2 || 1.20.3 || 1.20.4 || 1.20.5 || 1.20.6 || 1.23.0 || 1.23.1 || 1.20.7 || 1.20.8 || 1.25.0 || 1.25.1 || 1.25.2 || 1.27.1 || 1.27.2 || 7.3.13 || 7.3.15 || 7.4.1 || 7.4.1.20425 || 7.4.1.20439 || 7.4.3 || 7.4.3.20679 || 7.4.5 || 7.5.1.20813 || 7.5.1.20833 || 7.5.3 || 7.5.5 || 8.0.1.21160 || 8.0.1.21164 || 7.5.7 || 7.5.9 || 7.5.11 || 8.1.7.21585 || 7.5.13.21586 || 7.5.13.21598 || 8.2.1.21612 || 8.2.1.21650 || 7.5.15.21611 || 7.5.17.21680 || 8.2.3.30119 || 8.2.4.30130 || 8.4.0 || 7.5.19 || 8.4.1.30298 || 8.4.2.30317 || 8.4.1.30307 || 7.5.20 || 8.4.3 || 8.4.4.30419 || 8.4.4.30467 || 7.5.21.21732 || 8.4.5.30483 | Not reported |
Published upstream
Jul 1, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 9, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 1, 2026
A vulnerability in the ALZ 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 ALZ files during scanning, which may result in an out-of-bounds buffer write. An attacker could exploit this vulnerability by submitting a crafted file that contains ALZ 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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-20243 records a High severity (CVSS 7.5) vulnerability in ClamAV ALZ Archive Processing Denial of Service Vulnerability. The current sources do not mark it as known exploited. The current feed maps Cisco/Cisco Secure Endpoint (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Cisco/Cisco Secure Endpoint (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Cisco/Cisco Secure Endpointgeneric | 7.0.5 || 6.2.19 || 7.3.3 || 7.2.13 || 6.1.5 || 6.3.1 || 6.2.5 || 7.3.5 || 6.2.1 || 7.2.7 || 7.1.1 || 6.3.5 || 6.2.9 || 7.3.1 || 6.1.7 || 7.2.11 || 7.2.3 || 7.1.5 || 6.3.3 || 7.3.9 || 6.2.3 || 6.1.9 || 6.0.9 || 7.2.5 || 6.0.7 || 6.3.7 || 1.12.3 || 1.8.0 || 1.11.1 || 1.12.4 || 1.10.0 || 1.12.0 || 1.8.1 || 1.10.1 || 1.12.1 || 1.12.6 || 1.14.0 || 1.10.2 || 1.12.7 || 1.12.2 || 1.6.0 || 1.9.0 || 1.11.0 || 1.7.0 || 1.13.0 || 1.8.4 || 1.13.1 || 1.9.1 || 1.12.5 || 1.13.2 || 8.1.7.21512 || 8.1.7 || 8.1.5 || 8.1.3.21242 || 8.1.3 || 8.1.5.21322 || 8.1.7.21417 || 1.14.1 || 1.15.1 || 1.15.2 || 1.15.3 || 1.15.4 || 1.15.5 || 1.15.6 || 1.16.0 || 1.16.1 || 1.16.2 || 1.16.3 || 1.18.0 || 1.18.1 || 1.20.0 || 1.21.0 || 1.21.1 || 1.21.2 || 1.21.3 || 1.22.0 || 1.22.1 || 1.22.2 || 1.22.3 || 1.22.4 || 1.24.0 || 1.24.1 || 1.24.2 || 1.24.3 || 1.24.4 || 1.26.0 || 1.24.5 || 1.26.1 || 1.27.0 || 1.15.0 || 1.17.0 || 1.17.1 || 1.17.2 || 1.19.0 || 1.20.1 || 1.20.2 || 1.20.3 || 1.20.4 || 1.20.5 || 1.20.6 || 1.23.0 || 1.23.1 || 1.20.7 || 1.20.8 || 1.25.0 || 1.25.1 || 1.25.2 || 1.27.1 || 1.27.2 || 7.3.13 || 7.3.15 || 7.4.1 || 7.4.1.20425 || 7.4.1.20439 || 7.4.3 || 7.4.3.20679 || 7.4.5 || 7.5.1.20813 || 7.5.1.20833 || 7.5.3 || 7.5.5 || 8.0.1.21160 || 8.0.1.21164 || 7.5.7 || 7.5.9 || 7.5.11 || 8.1.7.21585 || 7.5.13.21586 || 7.5.13.21598 || 8.2.1.21612 || 8.2.1.21650 || 7.5.15.21611 || 7.5.17.21680 || 8.2.3.30119 || 8.2.4.30130 || 8.4.0 || 7.5.19 || 8.4.1.30298 || 8.4.2.30317 || 8.4.1.30307 || 7.5.20 || 8.4.3 || 8.4.4.30419 || 8.4.4.30467 || 7.5.21.21732 || 8.4.5.30483 | Not reported |
Published upstream
Jul 1, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 9, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 1, 2026
A vulnerability in the ALZ 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 ALZ files during scanning, which may result in an out-of-bounds buffer write. An attacker could exploit this vulnerability by submitting a crafted file that contains ALZ 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.
Quoted source text, attributed separately from HOL analysis.