CVE-2025-20333 (GCVE-0-2025-20333)
Vulnerability from cvelistv5
Published
2025-09-25 16:12
Modified
2026-02-26 17:47
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Summary
A vulnerability in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker to execute arbitrary code on an affected device.
This vulnerability is due to improper validation of user-supplied input in HTTP(S) requests. An attacker with valid VPN user credentials could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute arbitrary code as root, possibly resulting in the complete compromise of the affected device.
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Cisco | Cisco Secure Firewall Adaptive Security Appliance (ASA) Software |
Version: 9.8.1 Version: 9.8.1.5 Version: 9.8.1.7 Version: 9.8.2 Version: 9.8.2.8 Version: 9.8.2.14 Version: 9.8.2.15 Version: 9.8.2.17 Version: 9.8.2.20 Version: 9.8.2.24 Version: 9.8.2.26 Version: 9.8.2.28 Version: 9.8.2.33 Version: 9.8.2.35 Version: 9.8.2.38 Version: 9.8.3.8 Version: 9.8.3.11 Version: 9.8.3.14 Version: 9.8.3.16 Version: 9.8.3.18 Version: 9.8.3.21 Version: 9.8.3 Version: 9.8.3.26 Version: 9.8.3.29 Version: 9.8.4 Version: 9.8.4.3 Version: 9.8.4.7 Version: 9.8.4.8 Version: 9.8.4.10 Version: 9.8.4.12 Version: 9.8.4.15 Version: 9.8.4.17 Version: 9.8.2.45 Version: 9.8.4.25 Version: 9.8.4.20 Version: 9.8.4.22 Version: 9.8.4.26 Version: 9.8.4.29 Version: 9.8.4.32 Version: 9.8.4.33 Version: 9.8.4.34 Version: 9.8.4.35 Version: 9.8.4.39 Version: 9.8.4.40 Version: 9.8.4.41 Version: 9.8.4.43 Version: 9.8.4.44 Version: 9.8.4.45 Version: 9.8.4.46 Version: 9.8.4.48 Version: 9.12.1 Version: 9.12.1.2 Version: 9.12.1.3 Version: 9.12.2 Version: 9.12.2.4 Version: 9.12.2.5 Version: 9.12.2.9 Version: 9.12.3 Version: 9.12.3.2 Version: 9.12.3.7 Version: 9.12.4 Version: 9.12.3.12 Version: 9.12.3.9 Version: 9.12.2.1 Version: 9.12.4.2 Version: 9.12.4.4 Version: 9.12.4.7 Version: 9.12.4.10 Version: 9.12.4.13 Version: 9.12.4.8 Version: 9.12.4.18 Version: 9.12.4.24 Version: 9.12.4.26 Version: 9.12.4.29 Version: 9.12.4.30 Version: 9.12.4.35 Version: 9.12.4.37 Version: 9.12.4.38 Version: 9.12.4.39 Version: 9.12.4.40 Version: 9.12.4.41 Version: 9.12.4.47 Version: 9.12.4.48 Version: 9.12.4.50 Version: 9.12.4.52 Version: 9.12.4.54 Version: 9.12.4.55 Version: 9.12.4.56 Version: 9.12.4.58 Version: 9.12.4.62 Version: 9.12.4.65 Version: 9.12.4.67 Version: 9.14.1 Version: 9.14.1.10 Version: 9.14.1.6 Version: 9.14.1.15 Version: 9.14.1.19 Version: 9.14.1.30 Version: 9.14.2 Version: 9.14.2.4 Version: 9.14.2.8 Version: 9.14.2.13 Version: 9.14.2.15 Version: 9.14.3 Version: 9.14.3.1 Version: 9.14.3.9 Version: 9.14.3.11 Version: 9.14.3.13 Version: 9.14.3.18 Version: 9.14.3.15 Version: 9.14.4 Version: 9.14.4.6 Version: 9.14.4.7 Version: 9.14.4.12 Version: 9.14.4.13 Version: 9.14.4.14 Version: 9.14.4.15 Version: 9.14.4.17 Version: 9.14.4.22 Version: 9.14.4.23 Version: 9.14.4.24 Version: 9.16.1 Version: 9.16.1.28 Version: 9.16.2 Version: 9.16.2.3 Version: 9.16.2.7 Version: 9.16.2.11 Version: 9.16.2.13 Version: 9.16.2.14 Version: 9.16.3 Version: 9.16.3.3 Version: 9.16.3.14 Version: 9.16.3.15 Version: 9.16.3.19 Version: 9.16.3.23 Version: 9.16.4 Version: 9.16.4.9 Version: 9.16.4.14 Version: 9.16.4.18 Version: 9.16.4.19 Version: 9.16.4.27 Version: 9.16.4.38 Version: 9.16.4.39 Version: 9.16.4.42 Version: 9.16.4.48 Version: 9.16.4.55 Version: 9.16.4.57 Version: 9.16.4.61 Version: 9.16.4.62 Version: 9.16.4.67 Version: 9.16.4.70 Version: 9.16.4.71 Version: 9.16.4.76 Version: 9.16.4.82 Version: 9.16.4.84 Version: 9.17.1 Version: 9.17.1.7 Version: 9.17.1.9 Version: 9.17.1.10 Version: 9.17.1.11 Version: 9.17.1.13 Version: 9.17.1.15 Version: 9.17.1.20 Version: 9.17.1.30 Version: 9.17.1.33 Version: 9.17.1.39 Version: 9.18.1 Version: 9.18.1.3 Version: 9.18.2 Version: 9.18.2.5 Version: 9.18.2.7 Version: 9.18.2.8 Version: 9.18.3 Version: 9.18.3.39 Version: 9.18.3.46 Version: 9.18.3.53 Version: 9.18.3.55 Version: 9.18.3.56 Version: 9.18.4 Version: 9.18.4.5 Version: 9.18.4.8 Version: 9.18.4.22 Version: 9.18.4.24 Version: 9.18.4.29 Version: 9.18.4.34 Version: 9.18.4.40 Version: 9.19.1 Version: 9.19.1.5 Version: 9.19.1.9 Version: 9.19.1.12 Version: 9.19.1.18 Version: 9.19.1.22 Version: 9.19.1.24 Version: 9.19.1.27 Version: 9.19.1.28 Version: 9.19.1.31 Version: 9.20.1 Version: 9.20.1.5 Version: 9.20.2 Version: 9.20.2.10 Version: 9.20.2.21 Version: 9.20.2.22 Version: 9.20.3 Version: 9.20.3.4 Version: 9.22.1.1 Version: 9.22.1.2 |
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CISA Known Exploited Vulnerability
Data from the CISA Known Exploited Vulnerabilities Catalog
Date added: 2025-09-25
Due date: 2025-09-26
Required action: The KEV due date refers to the deadline by which FCEB agencies are expected to review and begin implementing the guidance outlined in Emergency Directive (ED) 25-03 (URL listed below in Notes). Agencies must follow the mitigation steps provided by CISA (URL listed below in Notes) and vendor’s instructions (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.
Used in ransomware: Unknown
Notes: CISA Mitigation Instructions: https://www.cisa.gov/news-events/directives/ed-25-03-identify-and-mitigate-potential-compromise-cisco-devices ; https://www.cisa.gov/news-events/directives/supplemental-direction-ed-25-03-core-dump-and-hunt-instructions ; https://www.cisa.gov/eviction-strategies-tool/create-from-template ; https://sec.cloudapps.cisco.com/security/center/resources/asa_ftd_continued_attacks ; https://sec.cloudapps.cisco.com/security/center/private/resources/asa_ftd_continued_attacks#Details ; https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-webvpn-z5xP8EUB ; https://nvd.nist.gov/vuln/detail/CVE-2025-20333
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"status": "affected",
"version": "9.18.4.22"
},
{
"status": "affected",
"version": "9.18.4.24"
},
{
"status": "affected",
"version": "9.18.4.29"
},
{
"status": "affected",
"version": "9.18.4.34"
},
{
"status": "affected",
"version": "9.18.4.40"
},
{
"status": "affected",
"version": "9.19.1"
},
{
"status": "affected",
"version": "9.19.1.5"
},
{
"status": "affected",
"version": "9.19.1.9"
},
{
"status": "affected",
"version": "9.19.1.12"
},
{
"status": "affected",
"version": "9.19.1.18"
},
{
"status": "affected",
"version": "9.19.1.22"
},
{
"status": "affected",
"version": "9.19.1.24"
},
{
"status": "affected",
"version": "9.19.1.27"
},
{
"status": "affected",
"version": "9.19.1.28"
},
{
"status": "affected",
"version": "9.19.1.31"
},
{
"status": "affected",
"version": "9.20.1"
},
{
"status": "affected",
"version": "9.20.1.5"
},
{
"status": "affected",
"version": "9.20.2"
},
{
"status": "affected",
"version": "9.20.2.10"
},
{
"status": "affected",
"version": "9.20.2.21"
},
{
"status": "affected",
"version": "9.20.2.22"
},
{
"status": "affected",
"version": "9.20.3"
},
{
"status": "affected",
"version": "9.20.3.4"
},
{
"status": "affected",
"version": "9.22.1.1"
},
{
"status": "affected",
"version": "9.22.1.2"
}
]
},
{
"product": "Cisco Secure Firewall Threat Defense (FTD) Software",
"vendor": "Cisco",
"versions": [
{
"status": "affected",
"version": "6.2.3"
},
{
"status": "affected",
"version": "6.2.3.1"
},
{
"status": "affected",
"version": "6.2.3.2"
},
{
"status": "affected",
"version": "6.2.3.3"
},
{
"status": "affected",
"version": "6.2.3.4"
},
{
"status": "affected",
"version": "6.2.3.5"
},
{
"status": "affected",
"version": "6.2.3.6"
},
{
"status": "affected",
"version": "6.2.3.7"
},
{
"status": "affected",
"version": "6.2.3.8"
},
{
"status": "affected",
"version": "6.2.3.10"
},
{
"status": "affected",
"version": "6.2.3.11"
},
{
"status": "affected",
"version": "6.2.3.9"
},
{
"status": "affected",
"version": "6.2.3.12"
},
{
"status": "affected",
"version": "6.2.3.13"
},
{
"status": "affected",
"version": "6.2.3.14"
},
{
"status": "affected",
"version": "6.2.3.15"
},
{
"status": "affected",
"version": "6.2.3.16"
},
{
"status": "affected",
"version": "6.2.3.17"
},
{
"status": "affected",
"version": "6.2.3.18"
},
{
"status": "affected",
"version": "6.6.0"
},
{
"status": "affected",
"version": "6.6.0.1"
},
{
"status": "affected",
"version": "6.6.1"
},
{
"status": "affected",
"version": "6.6.3"
},
{
"status": "affected",
"version": "6.6.4"
},
{
"status": "affected",
"version": "6.6.5"
},
{
"status": "affected",
"version": "6.6.5.1"
},
{
"status": "affected",
"version": "6.6.5.2"
},
{
"status": "affected",
"version": "6.6.7"
},
{
"status": "affected",
"version": "6.6.7.1"
},
{
"status": "affected",
"version": "6.6.7.2"
},
{
"status": "affected",
"version": "6.4.0"
},
{
"status": "affected",
"version": "6.4.0.1"
},
{
"status": "affected",
"version": "6.4.0.3"
},
{
"status": "affected",
"version": "6.4.0.2"
},
{
"status": "affected",
"version": "6.4.0.4"
},
{
"status": "affected",
"version": "6.4.0.5"
},
{
"status": "affected",
"version": "6.4.0.6"
},
{
"status": "affected",
"version": "6.4.0.7"
},
{
"status": "affected",
"version": "6.4.0.8"
},
{
"status": "affected",
"version": "6.4.0.9"
},
{
"status": "affected",
"version": "6.4.0.10"
},
{
"status": "affected",
"version": "6.4.0.11"
},
{
"status": "affected",
"version": "6.4.0.12"
},
{
"status": "affected",
"version": "6.4.0.13"
},
{
"status": "affected",
"version": "6.4.0.14"
},
{
"status": "affected",
"version": "6.4.0.15"
},
{
"status": "affected",
"version": "6.4.0.16"
},
{
"status": "affected",
"version": "6.4.0.17"
},
{
"status": "affected",
"version": "6.4.0.18"
},
{
"status": "affected",
"version": "7.0.0"
},
{
"status": "affected",
"version": "7.0.0.1"
},
{
"status": "affected",
"version": "7.0.1"
},
{
"status": "affected",
"version": "7.0.1.1"
},
{
"status": "affected",
"version": "7.0.2"
},
{
"status": "affected",
"version": "7.0.2.1"
},
{
"status": "affected",
"version": "7.0.3"
},
{
"status": "affected",
"version": "7.0.4"
},
{
"status": "affected",
"version": "7.0.5"
},
{
"status": "affected",
"version": "7.0.6"
},
{
"status": "affected",
"version": "7.0.6.1"
},
{
"status": "affected",
"version": "7.0.6.2"
},
{
"status": "affected",
"version": "7.0.6.3"
},
{
"status": "affected",
"version": "7.0.7"
},
{
"status": "affected",
"version": "7.0.8"
},
{
"status": "affected",
"version": "7.1.0"
},
{
"status": "affected",
"version": "7.1.0.1"
},
{
"status": "affected",
"version": "7.1.0.2"
},
{
"status": "affected",
"version": "7.1.0.3"
},
{
"status": "affected",
"version": "7.2.0"
},
{
"status": "affected",
"version": "7.2.0.1"
},
{
"status": "affected",
"version": "7.2.1"
},
{
"status": "affected",
"version": "7.2.2"
},
{
"status": "affected",
"version": "7.2.3"
},
{
"status": "affected",
"version": "7.2.4"
},
{
"status": "affected",
"version": "7.2.4.1"
},
{
"status": "affected",
"version": "7.2.5"
},
{
"status": "affected",
"version": "7.2.5.1"
},
{
"status": "affected",
"version": "7.2.6"
},
{
"status": "affected",
"version": "7.2.7"
},
{
"status": "affected",
"version": "7.2.5.2"
},
{
"status": "affected",
"version": "7.2.8"
},
{
"status": "affected",
"version": "7.2.8.1"
},
{
"status": "affected",
"version": "7.3.0"
},
{
"status": "affected",
"version": "7.3.1"
},
{
"status": "affected",
"version": "7.3.1.1"
},
{
"status": "affected",
"version": "7.3.1.2"
},
{
"status": "affected",
"version": "7.4.0"
},
{
"status": "affected",
"version": "7.4.1"
},
{
"status": "affected",
"version": "7.4.1.1"
},
{
"status": "affected",
"version": "7.4.2"
},
{
"status": "affected",
"version": "7.4.2.1"
},
{
"status": "affected",
"version": "7.4.2.2"
},
{
"status": "affected",
"version": "7.4.2.3"
},
{
"status": "affected",
"version": "7.6.0"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker to execute arbitrary code on an affected device.\r\n\r This vulnerability is due to improper validation of user-supplied input in HTTP(S) requests. An attacker with valid VPN user credentials could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute arbitrary code as root, possibly resulting in the complete compromise of the affected device."
}
],
"exploits": [
{
"lang": "en",
"value": "The Cisco Product Security Incident Response Team (PSIRT) is aware of attempted exploitation of this vulnerability. Cisco continues to strongly recommend that customers upgrade to a fixed software release to remediate this vulnerability."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.9,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/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": "2025-11-05T21:03:29.299Z",
"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"shortName": "cisco"
},
"references": [
{
"name": "cisco-sa-asaftd-webvpn-z5xP8EUB",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-webvpn-z5xP8EUB"
}
],
"source": {
"advisory": "cisco-sa-asaftd-webvpn-z5xP8EUB",
"defects": [
"CSCwq79831"
],
"discovery": "EXTERNAL"
}
}
},
"cveMetadata": {
"assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"assignerShortName": "cisco",
"cveId": "CVE-2025-20333",
"datePublished": "2025-09-25T16:12:14.308Z",
"dateReserved": "2024-10-10T19:15:13.255Z",
"dateUpdated": "2026-02-26T17:47:58.577Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"cisa_known_exploited": {
"cveID": "CVE-2025-20333",
"cwes": "[\"CWE-120\"]",
"dateAdded": "2025-09-25",
"dueDate": "2025-09-26",
"knownRansomwareCampaignUse": "Unknown",
"notes": "CISA Mitigation Instructions: https://www.cisa.gov/news-events/directives/ed-25-03-identify-and-mitigate-potential-compromise-cisco-devices ; https://www.cisa.gov/news-events/directives/supplemental-direction-ed-25-03-core-dump-and-hunt-instructions ; https://www.cisa.gov/eviction-strategies-tool/create-from-template ; https://sec.cloudapps.cisco.com/security/center/resources/asa_ftd_continued_attacks ; https://sec.cloudapps.cisco.com/security/center/private/resources/asa_ftd_continued_attacks#Details ; https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-webvpn-z5xP8EUB ; https://nvd.nist.gov/vuln/detail/CVE-2025-20333",
"product": "Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense",
"requiredAction": "The KEV due date refers to the deadline by which FCEB agencies are expected to review and begin implementing the guidance outlined in Emergency Directive (ED) 25-03 (URL listed below in Notes). Agencies must follow the mitigation steps provided by CISA (URL listed below in Notes) and vendor\u2019s instructions (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.",
"shortDescription": "Cisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FTD) Software VPN Web Server contain a buffer overflow vulnerability that allows for remote code execution. This vulnerability could be chained with CVE-2025-20362.",
"vendorProject": "Cisco",
"vulnerabilityName": "Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Buffer Overflow Vulnerability"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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