CVE-2026-20345 (GCVE-0-2026-20345)
Vulnerability from cvelistv5 – Published: 2026-08-07 16:42 – Updated: 2026-08-07 21:02
VLAI
EPSS
VEX
Title
ClamAV GPT File Format Processing Memory Corruption Vulnerability
Summary
A vulnerability in the GPT file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition or possibly other expanded impacts as a result of memory corruption on an affected device.
This vulnerability is due to improper handling of an endian conversion operation, which may result in an out-of-bounds buffer write. An attacker could exploit this vulnerability by submitting a crafted GPT file 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 2026-08-07 20:59 UTC
CWE
- CWE-121 - Stack-based Buffer Overflow
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Cisco | Cisco Secure Endpoint |
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: 1.10.2 Affected: 1.12.2 Affected: 1.6.0 Affected: 1.9.0 Affected: 1.7.0 Affected: 1.12.1 Affected: 1.12.6 Affected: 1.8.4 Affected: 1.11.0 Affected: 1.9.1 Affected: 1.12.5 Affected: 2.0.2 Affected: 1.1.0 Affected: 1.14.0 Affected: 2.4.0 Affected: 1.15.2 Affected: 1.16.0 Affected: 1.21.0 Affected: 1.22.2 Affected: 1.24.5 Affected: 1.19.0 |
guessed |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-20345",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-07T20:59:19.768388Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-08-07T21:02:19.379Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unknown",
"product": "Cisco Secure Endpoint",
"vendor": "Cisco",
"versions": [
{
"status": "affected",
"version": "1.12.3"
},
{
"status": "affected",
"version": "1.8.0"
},
{
"status": "affected",
"version": "1.11.1"
},
{
"status": "affected",
"version": "1.12.4"
},
{
"status": "affected",
"version": "1.10.0"
},
{
"status": "affected",
"version": "1.12.0"
},
{
"status": "affected",
"version": "1.8.1"
},
{
"status": "affected",
"version": "1.10.1"
},
{
"status": "affected",
"version": "1.10.2"
},
{
"status": "affected",
"version": "1.12.2"
},
{
"status": "affected",
"version": "1.6.0"
},
{
"status": "affected",
"version": "1.9.0"
},
{
"status": "affected",
"version": "1.7.0"
},
{
"status": "affected",
"version": "1.12.1"
},
{
"status": "affected",
"version": "1.12.6"
},
{
"status": "affected",
"version": "1.8.4"
},
{
"status": "affected",
"version": "1.11.0"
},
{
"status": "affected",
"version": "1.9.1"
},
{
"status": "affected",
"version": "1.12.5"
},
{
"status": "affected",
"version": "2.0.2"
},
{
"status": "affected",
"version": "1.1.0"
},
{
"status": "affected",
"version": "1.14.0"
},
{
"status": "affected",
"version": "2.4.0"
},
{
"status": "affected",
"version": "1.15.2"
},
{
"status": "affected",
"version": "1.16.0"
},
{
"status": "affected",
"version": "1.21.0"
},
{
"status": "affected",
"version": "1.22.2"
},
{
"status": "affected",
"version": "1.24.5"
},
{
"status": "affected",
"version": "1.19.0"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability in the GPT file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition or possibly other expanded impacts as a result of\u0026nbsp;memory corruption on an affected device.\r\n\r\nThis vulnerability is due to improper handling of an endian conversion operation, which may result in an out-of-bounds buffer write. An attacker could exploit this vulnerability by submitting a crafted GPT file 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 aware that proof-of-concept exploit code is available for the vulnerabilities that are described in CVE-2026-20337 and CVE-2026-20338.\r\n\r\nThe Cisco PSIRT is not aware of proof-of-concept exploit code for any of the other vulnerabilities that are described in this advisory.\r\nThe Cisco PSIRT is not aware of any 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-121",
"description": "Stack-based Buffer Overflow",
"lang": "en",
"type": "cwe"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-07T16:42:46.329Z",
"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"shortName": "cisco"
},
"references": [
{
"name": "cisco-sa-clamav-WuuvVd26",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-WuuvVd26"
}
],
"source": {
"advisory": "cisco-sa-clamav-WuuvVd26",
"defects": [
"CSCwv55000"
],
"discovery": "EXTERNAL"
},
"title": "ClamAV GPT File Format Processing Memory Corruption Vulnerability"
}
},
"cveMetadata": {
"assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"assignerShortName": "cisco",
"cveId": "CVE-2026-20345",
"datePublished": "2026-08-07T16:42:46.329Z",
"dateReserved": "2025-10-08T11:59:15.413Z",
"dateUpdated": "2026-08-07T21:02:19.379Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-20345",
"date": "2026-10-27",
"epss": "0.00559",
"percentile": "0.4635"
},
"microsoft_vex": {
"current_release_date": "2026-08-23T14:48:11.000Z",
"cve": "CVE-2026-20345",
"id": "msrc_CVE-2026-20345",
"initial_release_date": "2026-08-11T01:17:25.000Z",
"product_status:fixed": "1",
"product_status:known_affected": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "ClamAV GPT File Format Processing Memory Corruption Vulnerability",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-20345.json",
"version": "2"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unknown",
"product": "Cisco Secure Endpoint",
"vendor": "Cisco",
"versions": [
{
"status": "affected",
"version": "1.12.3"
},
{
"status": "affected",
"version": "1.8.0"
},
{
"status": "affected",
"version": "1.11.1"
},
{
"status": "affected",
"version": "1.12.4"
},
{
"status": "affected",
"version": "1.10.0"
},
{
"status": "affected",
"version": "1.12.0"
},
{
"status": "affected",
"version": "1.8.1"
},
{
"status": "affected",
"version": "1.10.1"
},
{
"status": "affected",
"version": "1.10.2"
},
{
"status": "affected",
"version": "1.12.2"
},
{
"status": "affected",
"version": "1.6.0"
},
{
"status": "affected",
"version": "1.9.0"
},
{
"status": "affected",
"version": "1.7.0"
},
{
"status": "affected",
"version": "1.12.1"
},
{
"status": "affected",
"version": "1.12.6"
},
{
"status": "affected",
"version": "1.8.4"
},
{
"status": "affected",
"version": "1.11.0"
},
{
"status": "affected",
"version": "1.9.1"
},
{
"status": "affected",
"version": "1.12.5"
},
{
"status": "affected",
"version": "2.0.2"
},
{
"status": "affected",
"version": "1.1.0"
},
{
"status": "affected",
"version": "1.14.0"
},
{
"status": "affected",
"version": "2.4.0"
},
{
"status": "affected",
"version": "1.15.2"
},
{
"status": "affected",
"version": "1.16.0"
},
{
"status": "affected",
"version": "1.21.0"
},
{
"status": "affected",
"version": "1.22.2"
},
{
"status": "affected",
"version": "1.24.5"
},
{
"status": "affected",
"version": "1.19.0"
}
]
}
],
"source": "psirt@cisco.com"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability in the GPT file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition or possibly other expanded impacts as a result of\u0026nbsp;memory corruption on an affected device.\r\n\r\nThis vulnerability is due to improper handling of an endian conversion operation, which may result in an out-of-bounds buffer write. An attacker could exploit this vulnerability by submitting a crafted GPT file 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."
},
{
"lang": "es",
"value": "Una vulnerabilidad en el analizador de formato de archivo GPT de ClamAV podr\u00eda permitir a un atacante remoto no autenticado causar una condici\u00f3n de DoS o posiblemente otros impactos expandidos como resultado de corrupci\u00f3n de memoria en un dispositivo afectado.\n\nEsta vulnerabilidad se debe a un manejo inadecuado de una operaci\u00f3n de conversi\u00f3n endian, lo que puede resultar en una escritura de b\u00fafer fuera de l\u00edmites. Un atacante podr\u00eda explotar esta vulnerabilidad al enviar un archivo GPT manipulado para ser escaneado por ClamAV en un dispositivo afectado. Un exploit exitoso podr\u00eda permitir al atacante causar la terminaci\u00f3n del proceso de escaneo de ClamAV, lo que resultar\u00eda en una condici\u00f3n de DoS en el software afectado."
}
],
"id": "CVE-2026-20345",
"lastModified": "2026-10-23T20:10:00.160",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"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"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"source": "psirt@cisco.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-20345",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-07T20:59:19.768388Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-08-07T17:17:03.003",
"references": [
{
"source": "psirt@cisco.com",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-WuuvVd26"
}
],
"sourceIdentifier": "psirt@cisco.com",
"vulnStatus": "Awaiting Analysis",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-121"
}
],
"source": "psirt@cisco.com",
"type": "Secondary"
}
]
}
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-09-16T23:40:12Z",
"cve": "CVE-2026-20345",
"id": "CVE-2026-20345",
"initial_release_date": "2026-08-10T16:36:53Z",
"product_status:first_fixed": "40",
"product_status:known_affected": "78",
"product_status:recommended": "186",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-20345",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-20345.json",
"version": "5"
},
"vulnrichment": {
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-20345",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-07T20:59:19.768388Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-08-07T20:59:31.960Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unknown",
"product": "Cisco Secure Endpoint",
"vendor": "Cisco",
"versions": [
{
"status": "affected",
"version": "1.12.3"
},
{
"status": "affected",
"version": "1.8.0"
},
{
"status": "affected",
"version": "1.11.1"
},
{
"status": "affected",
"version": "1.12.4"
},
{
"status": "affected",
"version": "1.10.0"
},
{
"status": "affected",
"version": "1.12.0"
},
{
"status": "affected",
"version": "1.8.1"
},
{
"status": "affected",
"version": "1.10.1"
},
{
"status": "affected",
"version": "1.10.2"
},
{
"status": "affected",
"version": "1.12.2"
},
{
"status": "affected",
"version": "1.6.0"
},
{
"status": "affected",
"version": "1.9.0"
},
{
"status": "affected",
"version": "1.7.0"
},
{
"status": "affected",
"version": "1.12.1"
},
{
"status": "affected",
"version": "1.12.6"
},
{
"status": "affected",
"version": "1.8.4"
},
{
"status": "affected",
"version": "1.11.0"
},
{
"status": "affected",
"version": "1.9.1"
},
{
"status": "affected",
"version": "1.12.5"
},
{
"status": "affected",
"version": "2.0.2"
},
{
"status": "affected",
"version": "1.1.0"
},
{
"status": "affected",
"version": "1.14.0"
},
{
"status": "affected",
"version": "2.4.0"
},
{
"status": "affected",
"version": "1.15.2"
},
{
"status": "affected",
"version": "1.16.0"
},
{
"status": "affected",
"version": "1.21.0"
},
{
"status": "affected",
"version": "1.22.2"
},
{
"status": "affected",
"version": "1.24.5"
},
{
"status": "affected",
"version": "1.19.0"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability in the GPT file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition or possibly other expanded impacts as a result of\u0026nbsp;memory corruption on an affected device.\r\n\r\nThis vulnerability is due to improper handling of an endian conversion operation, which may result in an out-of-bounds buffer write. An attacker could exploit this vulnerability by submitting a crafted GPT file 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 aware that proof-of-concept exploit code is available for the vulnerabilities that are described in CVE-2026-20337 and CVE-2026-20338.\r\n\r\nThe Cisco PSIRT is not aware of proof-of-concept exploit code for any of the other vulnerabilities that are described in this advisory.\r\nThe Cisco PSIRT is not aware of any 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-121",
"description": "Stack-based Buffer Overflow",
"lang": "en",
"type": "cwe"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-07T16:42:46.329Z",
"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"shortName": "cisco"
},
"references": [
{
"name": "cisco-sa-clamav-WuuvVd26",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-WuuvVd26"
}
],
"source": {
"advisory": "cisco-sa-clamav-WuuvVd26",
"defects": [
"CSCwv55000"
],
"discovery": "EXTERNAL"
},
"title": "ClamAV GPT File Format Processing Memory Corruption Vulnerability"
}
},
"cveMetadata": {
"assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"assignerShortName": "cisco",
"cveId": "CVE-2026-20345",
"datePublished": "2026-08-07T16:42:46.329Z",
"dateReserved": "2025-10-08T11:59:15.413Z",
"dateUpdated": "2026-08-07T21:02:19.379Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
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
Loading timeline…
Loading…
Loading…
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.
Loading…
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.