CVE-2026-20243 (GCVE-0-2026-20243)
Vulnerability from cvelistv5 – Published: 2026-07-01 16:30 – Updated: 2026-07-01 17:25
VLAI
EPSS
VEX
Title
ClamAV ALZ Archive Processing Denial of Service Vulnerability
Summary
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.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-01 17:19 UTC
CWE
- CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Cisco | Cisco Secure Endpoint |
Affected:
7.0.5
Affected: 6.2.19 Affected: 7.3.3 Affected: 7.2.13 Affected: 6.1.5 Affected: 6.3.1 Affected: 6.2.5 Affected: 7.3.5 Affected: 6.2.1 Affected: 7.2.7 Affected: 7.1.1 Affected: 6.3.5 Affected: 6.2.9 Affected: 7.3.1 Affected: 6.1.7 Affected: 7.2.11 Affected: 7.2.3 Affected: 7.1.5 Affected: 6.3.3 Affected: 7.3.9 Affected: 6.2.3 Affected: 6.1.9 Affected: 6.0.9 Affected: 7.2.5 Affected: 6.0.7 Affected: 6.3.7 Affected: 1.12.3 Affected: 1.8.0 Affected: 1.11.1 Affected: 1.12.4 Affected: 1.10.0 Affected: 1.12.0 Affected: 1.8.1 Affected: 1.10.1 Affected: 1.12.1 Affected: 1.12.6 Affected: 1.14.0 Affected: 1.10.2 Affected: 1.12.7 Affected: 1.12.2 Affected: 1.6.0 Affected: 1.9.0 Affected: 1.11.0 Affected: 1.7.0 Affected: 1.13.0 Affected: 1.8.4 Affected: 1.13.1 Affected: 1.9.1 Affected: 1.12.5 Affected: 1.13.2 Affected: 8.1.7.21512 Affected: 8.1.7 Affected: 8.1.5 Affected: 8.1.3.21242 Affected: 8.1.3 Affected: 8.1.5.21322 Affected: 8.1.7.21417 Affected: 1.14.1 Affected: 1.15.1 Affected: 1.15.2 Affected: 1.15.3 Affected: 1.15.4 Affected: 1.15.5 Affected: 1.15.6 Affected: 1.16.0 Affected: 1.16.1 Affected: 1.16.2 Affected: 1.16.3 Affected: 1.18.0 Affected: 1.18.1 Affected: 1.20.0 Affected: 1.21.0 Affected: 1.21.1 Affected: 1.21.2 Affected: 1.21.3 Affected: 1.22.0 Affected: 1.22.1 Affected: 1.22.2 Affected: 1.22.3 Affected: 1.22.4 Affected: 1.24.0 Affected: 1.24.1 Affected: 1.24.2 Affected: 1.24.3 Affected: 1.24.4 Affected: 1.26.0 Affected: 1.24.5 Affected: 1.26.1 Affected: 1.27.0 Affected: 1.15.0 Affected: 1.17.0 Affected: 1.17.1 Affected: 1.17.2 Affected: 1.19.0 Affected: 1.20.1 Affected: 1.20.2 Affected: 1.20.3 Affected: 1.20.4 Affected: 1.20.5 Affected: 1.20.6 Affected: 1.23.0 Affected: 1.23.1 Affected: 1.20.7 Affected: 1.20.8 Affected: 1.25.0 Affected: 1.25.1 Affected: 1.25.2 Affected: 1.27.1 Affected: 1.27.2 Affected: 7.3.13 Affected: 7.3.15 Affected: 7.4.1 Affected: 7.4.1.20425 Affected: 7.4.1.20439 Affected: 7.4.3 Affected: 7.4.3.20679 Affected: 7.4.5 Affected: 7.5.1.20813 Affected: 7.5.1.20833 Affected: 7.5.3 Affected: 7.5.5 Affected: 8.0.1.21160 Affected: 8.0.1.21164 Affected: 7.5.7 Affected: 7.5.9 Affected: 7.5.11 Affected: 8.1.7.21585 Affected: 7.5.13.21586 Affected: 7.5.13.21598 Affected: 8.2.1.21612 Affected: 8.2.1.21650 Affected: 7.5.15.21611 Affected: 7.5.17.21680 Affected: 8.2.3.30119 Affected: 8.2.4.30130 Affected: 8.4.0 Affected: 7.5.19 Affected: 8.4.1.30298 Affected: 8.4.2.30317 Affected: 8.4.1.30307 Affected: 7.5.20 Affected: 8.4.3 Affected: 8.4.4.30419 Affected: 8.4.4.30467 Affected: 7.5.21.21732 Affected: 8.4.5.30483 |
guessed |
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"status": "affected",
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"descriptions": [
{
"lang": "en",
"value": "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.\r\n\r\nThis 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."
}
],
"exploits": [
{
"lang": "en",
"value": "The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"format": "cvssV3_1"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-120",
"description": "Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)",
"lang": "en",
"type": "cwe"
}
]
}
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"shortName": "cisco"
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"references": [
{
"name": "cisco-sa-clamav-88cFYyxR",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-88cFYyxR"
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],
"source": {
"advisory": "cisco-sa-clamav-88cFYyxR",
"defects": [
"CSCwu18798"
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"discovery": "EXTERNAL"
},
"title": "ClamAV ALZ Archive Processing Denial of Service Vulnerability"
}
},
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"assignerShortName": "cisco",
"cveId": "CVE-2026-20243",
"datePublished": "2026-07-01T16:30:20.848Z",
"dateReserved": "2025-10-08T11:59:15.400Z",
"dateUpdated": "2026-07-01T17:25:08.088Z",
"state": "PUBLISHED"
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"dataVersion": "5.2",
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"date": "2026-11-02",
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"id": "msrc_CVE-2026-20243",
"initial_release_date": "2026-07-02T00:00:00.000Z",
"product_status:known_affected": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "ClamAV ALZ Archive Processing Denial of Service Vulnerability",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-20243.json",
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"version": "1.25.1"
},
{
"status": "affected",
"version": "1.25.2"
},
{
"status": "affected",
"version": "1.27.1"
},
{
"status": "affected",
"version": "1.27.2"
},
{
"status": "affected",
"version": "7.3.13"
},
{
"status": "affected",
"version": "7.3.15"
},
{
"status": "affected",
"version": "7.4.1"
},
{
"status": "affected",
"version": "7.4.1.20425"
},
{
"status": "affected",
"version": "7.4.1.20439"
},
{
"status": "affected",
"version": "7.4.3"
},
{
"status": "affected",
"version": "7.4.3.20679"
},
{
"status": "affected",
"version": "7.4.5"
},
{
"status": "affected",
"version": "7.5.1.20813"
},
{
"status": "affected",
"version": "7.5.1.20833"
},
{
"status": "affected",
"version": "7.5.3"
},
{
"status": "affected",
"version": "7.5.5"
},
{
"status": "affected",
"version": "8.0.1.21160"
},
{
"status": "affected",
"version": "8.0.1.21164"
},
{
"status": "affected",
"version": "7.5.7"
},
{
"status": "affected",
"version": "7.5.9"
},
{
"status": "affected",
"version": "7.5.11"
},
{
"status": "affected",
"version": "8.1.7.21585"
},
{
"status": "affected",
"version": "7.5.13.21586"
},
{
"status": "affected",
"version": "7.5.13.21598"
},
{
"status": "affected",
"version": "8.2.1.21612"
},
{
"status": "affected",
"version": "8.2.1.21650"
},
{
"status": "affected",
"version": "7.5.15.21611"
},
{
"status": "affected",
"version": "7.5.17.21680"
},
{
"status": "affected",
"version": "8.2.3.30119"
},
{
"status": "affected",
"version": "8.2.4.30130"
},
{
"status": "affected",
"version": "8.4.0"
},
{
"status": "affected",
"version": "7.5.19"
},
{
"status": "affected",
"version": "8.4.1.30298"
},
{
"status": "affected",
"version": "8.4.2.30317"
},
{
"status": "affected",
"version": "8.4.1.30307"
},
{
"status": "affected",
"version": "7.5.20"
},
{
"status": "affected",
"version": "8.4.3"
},
{
"status": "affected",
"version": "8.4.4.30419"
},
{
"status": "affected",
"version": "8.4.4.30467"
},
{
"status": "affected",
"version": "7.5.21.21732"
},
{
"status": "affected",
"version": "8.4.5.30483"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "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.\r\n\r\nThis 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."
}
],
"exploits": [
{
"lang": "en",
"value": "The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"format": "cvssV3_1"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-120",
"description": "Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)",
"lang": "en",
"type": "cwe"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-01T16:30:20.848Z",
"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"shortName": "cisco"
},
"references": [
{
"name": "cisco-sa-clamav-88cFYyxR",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-88cFYyxR"
}
],
"source": {
"advisory": "cisco-sa-clamav-88cFYyxR",
"defects": [
"CSCwu18798"
],
"discovery": "EXTERNAL"
},
"title": "ClamAV ALZ Archive Processing Denial of Service Vulnerability"
}
},
"cveMetadata": {
"assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"assignerShortName": "cisco",
"cveId": "CVE-2026-20243",
"datePublished": "2026-07-01T16:30:20.848Z",
"dateReserved": "2025-10-08T11:59:15.400Z",
"dateUpdated": "2026-07-01T17:25:08.088Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.